File: ne_pkcs11.c

package info (click to toggle)
neon27 0.30.2-2
  • links: PTS
  • area: main
  • in suites: stretch
  • size: 4,940 kB
  • ctags: 3,303
  • sloc: ansic: 24,449; xml: 3,673; sh: 3,557; makefile: 595
file content (629 lines) | stat: -rw-r--r-- 19,116 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
/*
   neon PKCS#11 support
   Copyright (C) 2008, Joe Orton <joe@manyfish.co.uk>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA
*/

#include "config.h"

#include "ne_pkcs11.h"

#ifdef HAVE_PAKCHOIS
#include <string.h>

#include <pakchois.h>

#include "ne_internal.h"
#include "ne_alloc.h"
#include "ne_private.h"
#include "ne_privssl.h"

struct ne_ssl_pkcs11_provider_s {
    pakchois_module_t *module;
    ne_ssl_pkcs11_pin_fn pin_fn;
    void *pin_data;
    pakchois_session_t *session;
    ne_ssl_client_cert *clicert;
    ck_object_handle_t privkey;
    ck_key_type_t keytype;
#ifdef HAVE_OPENSSL
    RSA_METHOD *method;
#endif
};

/* To do list for PKCS#11 support:

   - propagate error strings back to ne_session; use new 
   pakchois_error() for pakchois API 0.2
   - add API to specify a particular slot number to use for clicert
   - add API to specify a particular cert ID for clicert
   - find a certificate which has an issuer matching the 
     CA dnames given by GnuTLS
   - make sure subject name matches between pubkey and privkey
   - check error handling & fail gracefully if the token is 
   ejected mid-session
   - add API to enumerate/search provided certs and allow 
     direct choice? (or just punt)
   - the session<->provider interface requires that 
   one clicert is used for all sessions.  remove this limitation
   - add API to import all CA certs as trusted
   (CKA_CERTIFICATE_CATEGORY seems to be unused unfortunately; 
    just add all X509 certs with CKA_TRUSTED set to true))
   - make DSA work

*/

#ifdef HAVE_OPENSSL

#include <openssl/rsa.h>
#include <openssl/err.h>

#if defined(RSA_F_RSA_PRIVATE_ENCRYPT)
#define PK11_RSA_ERR (RSA_F_RSA_PRIVATE_ENCRYPT)
#else
#define PK11_RSA_ERR (RSA_F_RSA_EAY_PRIVATE_ENCRYPT)
#endif

#if OPENSSL_VERSION_NUMBER < 0x10100000L
/* Compatibility functions for OpenSSL < 1.1.0: */
#define RSA_meth_get0_app_data(rsa) (void *)(rsa->app_data)
static RSA_METHOD *RSA_meth_new(const char *name, int flags)
{
    RSA_METHOD *m = ne_calloc(sizeof *m);

    m->name = name;
    m->flags = flags;

    return m;

}
#define RSA_meth_free ne_free
#define RSA_meth_set_priv_enc(m, f) (m)->rsa_priv_enc = (f)
#define RSA_meth_set0_app_data(m, f) (m)->app_data = (void *)(f)
#endif

/* RSA_METHOD ->rsa_private_encrypt calback. */
static int pk11_rsa_encrypt(int mlen, const unsigned char *m, 
                            unsigned char *sigret,
                            RSA *r, int padding)
{
    const RSA_METHOD *method = RSA_get_method(r);
    ne_ssl_pkcs11_provider *prov = RSA_meth_get0_app_data(method);
    ck_rv_t rv;
    struct ck_mechanism mech;
    unsigned long len;

    if (!prov->session || prov->privkey == CK_INVALID_HANDLE) {
        NE_DEBUG(NE_DBG_SSL, "pk11: Cannot sign, no session/key.\n");
        RSAerr(PK11_RSA_ERR,ERR_R_RSA_LIB);
        return 0;
    }

    if (padding != RSA_PKCS1_PADDING) {
        NE_DEBUG(NE_DBG_SSL, "pk11: Cannot sign, unknown padding mode '%d'.\n", padding);
        RSAerr(PK11_RSA_ERR,ERR_R_RSA_LIB);
        return 0;
    }        

    mech.mechanism = CKM_RSA_PKCS;
    mech.parameter = NULL;
    mech.parameter_len = 0;

    /* Initialize signing operation; using the private key discovered
     * earlier. */
    rv = pakchois_sign_init(prov->session, &mech, prov->privkey);
    if (rv != CKR_OK) {
        NE_DEBUG(NE_DBG_SSL, "pk11: SignInit failed: %lx.\n", rv);
        RSAerr(PK11_RSA_ERR, ERR_R_RSA_LIB);
        return 0;
    }

    len = RSA_size(r);
    rv = pakchois_sign(prov->session, (unsigned char *)m, mlen, sigret, &len);
    if (rv != CKR_OK) {
        NE_DEBUG(NE_DBG_SSL, "pk11: Sign failed.\n");
        RSAerr(PK11_RSA_ERR, ERR_R_RSA_LIB);
        return 0;
    }

    NE_DEBUG(NE_DBG_SSL, "pk11: Signed successfully.\n");
    return len;
}

/* Return an RSA_METHOD which will use the PKCS#11 provider to
 * implement the signing operation. */
static RSA_METHOD *pk11_rsa_method(ne_ssl_pkcs11_provider *prov)
{
    RSA_METHOD *m = RSA_meth_new("neon PKCS#11", RSA_METHOD_FLAG_NO_CHECK);

    RSA_meth_set_priv_enc(m, pk11_rsa_encrypt);
    RSA_meth_set0_app_data(m, prov);

    return m;
}
#endif

#ifdef HAVE_GNUTLS
static int pk11_sign_callback(gnutls_privkey_t pkey,
                              void *userdata,
                              const gnutls_datum_t *raw_data,
                              gnutls_datum_t *signature);
#endif

static int pk11_find_x509(ne_ssl_pkcs11_provider *prov,
                          pakchois_session_t *pks, 
                          unsigned char *certid, unsigned long *cid_len)
{
    struct ck_attribute a[3];
    ck_object_class_t class;
    ck_certificate_type_t type;
    ck_rv_t rv;
    ck_object_handle_t obj;
    unsigned long count;
    int found = 0;

    /* Find objects with cert class and X.509 cert type. */
    class = CKO_CERTIFICATE;
    type = CKC_X_509;

    a[0].type = CKA_CLASS;
    a[0].value = &class;
    a[0].value_len = sizeof class;
    a[1].type = CKA_CERTIFICATE_TYPE;
    a[1].value = &type;
    a[1].value_len = sizeof type;

    rv = pakchois_find_objects_init(pks, a, 2);
    if (rv != CKR_OK) {
        NE_DEBUG(NE_DBG_SSL, "pk11: FindObjectsInit failed.\n");
        return 0;
    }

    while (pakchois_find_objects(pks, &obj, 1, &count) == CKR_OK
           && count == 1) {
        unsigned char value[8192], subject[8192];

        a[0].type = CKA_VALUE;
        a[0].value = value;
        a[0].value_len = sizeof value;
        a[1].type = CKA_ID;
        a[1].value = certid;
        a[1].value_len = *cid_len;
        a[2].type = CKA_SUBJECT;
        a[2].value = subject;
        a[2].value_len = sizeof subject;

        if (pakchois_get_attribute_value(pks, obj, a, 3) == CKR_OK) {
            ne_ssl_client_cert *cc;
            
#ifdef HAVE_GNUTLS
            cc = ne__ssl_clicert_exkey_import(value, a[0].value_len, pk11_sign_callback, prov);
#else
            cc = ne__ssl_clicert_exkey_import(value, a[0].value_len, prov->method);
#endif
            if (cc) {
                NE_DEBUG(NE_DBG_SSL, "pk11: Imported X.509 cert.\n");
                prov->clicert = cc;
                found = 1;
                *cid_len = a[1].value_len;
                break;
            }
        }
        else {
            NE_DEBUG(NE_DBG_SSL, "pk11: Skipped cert, missing attrs.\n");
        }
    }

    pakchois_find_objects_final(pks);
    return found;    
}

#ifdef HAVE_OPENSSL
/* No DSA support for OpenSSL (yet, anyway). */
#define KEYTYPE_IS_DSA(kt) (0)
#else
#define KEYTYPE_IS_DSA(kt) (kt == CKK_DSA)
#endif

static int pk11_find_pkey(ne_ssl_pkcs11_provider *prov, 
                          pakchois_session_t *pks,
                          unsigned char *certid, unsigned long cid_len)
{
    struct ck_attribute a[3];
    ck_object_class_t class;
    ck_rv_t rv;
    ck_object_handle_t obj;
    unsigned long count;
    int found = 0;

    class = CKO_PRIVATE_KEY;

    /* Find an object with private key class and a certificate ID
     * which matches the certificate. */
    /* FIXME: also match the cert subject. */
    a[0].type = CKA_CLASS;
    a[0].value = &class;
    a[0].value_len = sizeof class;
    a[1].type = CKA_ID;
    a[1].value = certid;
    a[1].value_len = cid_len;

    rv = pakchois_find_objects_init(pks, a, 2);
    if (rv != CKR_OK) {
        NE_DEBUG(NE_DBG_SSL, "pk11: FindObjectsInit failed.\n");
        /* TODO: error propagation */
        return 0;
    }

    rv = pakchois_find_objects(pks, &obj, 1, &count);
    if (rv == CKR_OK && count == 1) {
        NE_DEBUG(NE_DBG_SSL, "pk11: Found private key.\n");

        a[0].type = CKA_KEY_TYPE;
        a[0].value = &prov->keytype;
        a[0].value_len = sizeof prov->keytype;

        if (pakchois_get_attribute_value(pks, obj, a, 1) == CKR_OK
            && (prov->keytype == CKK_RSA || KEYTYPE_IS_DSA(prov->keytype))) {
            found = 1;
            prov->privkey = obj;
        }
        else {
            NE_DEBUG(NE_DBG_SSL, "pk11: Could not determine key type.\n");
        }
    }

    pakchois_find_objects_final(pks);

    return found;
}

static int find_client_cert(ne_ssl_pkcs11_provider *prov,
                            pakchois_session_t *pks)
{
    unsigned char certid[8192];
    unsigned long cid_len = sizeof certid;

    /* TODO: match cert subject too. */
    return pk11_find_x509(prov, pks, certid, &cid_len) 
        && pk11_find_pkey(prov, pks, certid, cid_len);
}

#ifdef HAVE_GNUTLS
/* Callback invoked by GnuTLS to provide the signature.  The signature
 * operation is handled here by the PKCS#11 provider.  */
static int pk11_sign_callback(gnutls_privkey_t pkey,
                              void *userdata,
                              const gnutls_datum_t *hash,
                              gnutls_datum_t *signature)
{
    ne_ssl_pkcs11_provider *prov = userdata;
    ck_rv_t rv;
    struct ck_mechanism mech;
    unsigned long siglen;

    if (!prov->session || prov->privkey == CK_INVALID_HANDLE) {
        NE_DEBUG(NE_DBG_SSL, "pk11: Cannot sign, no session/key.\n");
        return GNUTLS_E_NO_CERTIFICATE_FOUND;
    }

    mech.mechanism = prov->keytype == CKK_DSA ? CKM_DSA : CKM_RSA_PKCS;
    mech.parameter = NULL;
    mech.parameter_len = 0;

    /* Initialize signing operation; using the private key discovered
     * earlier. */
    rv = pakchois_sign_init(prov->session, &mech, prov->privkey);
    if (rv != CKR_OK) {
        NE_DEBUG(NE_DBG_SSL, "pk11: SignInit failed: %lx.\n", rv);
        return GNUTLS_E_PK_SIGN_FAILED;
    }

    /* Work out how long the signature must be: */
    rv = pakchois_sign(prov->session, hash->data, hash->size, NULL, &siglen);
    if (rv != CKR_OK) {
        NE_DEBUG(NE_DBG_SSL, "pk11: Sign1 failed.\n");
        return GNUTLS_E_PK_SIGN_FAILED;
    }

    signature->data = gnutls_malloc(siglen);
    signature->size = siglen;

    rv = pakchois_sign(prov->session, hash->data, hash->size, 
                       signature->data, &siglen);
    if (rv != CKR_OK) {
        NE_DEBUG(NE_DBG_SSL, "pk11: Sign2 failed.\n");
        return GNUTLS_E_PK_SIGN_FAILED;
    }

    NE_DEBUG(NE_DBG_SSL, "pk11: Signed successfully.\n");

    return 0;
}
#endif

static void terminate_string(unsigned char *str, size_t len)
{
    unsigned char *ptr = str + len - 1;

    while ((*ptr == ' ' || *ptr == '\t' || *ptr == '\0') && ptr >= str)
        ptr--;
    
    if (ptr == str - 1)
        str[0] = '\0';
    else if (ptr == str + len - 1)
        str[len-1] = '\0';
    else
        ptr[1] = '\0';
}

static int pk11_login(ne_ssl_pkcs11_provider *prov, ck_slot_id_t slot_id,
                      pakchois_session_t *pks, struct ck_slot_info *sinfo)
{
    struct ck_token_info tinfo;
    int attempt = 0;
    ck_rv_t rv;

    if (pakchois_get_token_info(prov->module, slot_id, &tinfo) != CKR_OK) {
        NE_DEBUG(NE_DBG_SSL, "pk11: GetTokenInfo failed\n");
        /* TODO: propagate error. */
        return -1;
    }

    if ((tinfo.flags & CKF_LOGIN_REQUIRED) == 0) {
        NE_DEBUG(NE_DBG_SSL, "pk11: No login required.\n");
        return 0;
    }

    /* For a token with a "protected" (out-of-band) authentication
     * path, calling login with a NULL username is all that is
     * required. */
    if (tinfo.flags & CKF_PROTECTED_AUTHENTICATION_PATH) {
        if (pakchois_login(pks, CKU_USER, NULL, 0) == CKR_OK) {
            return 0;
        }
        else {
            NE_DEBUG(NE_DBG_SSL, "pk11: Protected login failed.\n");
            /* TODO: error propagation. */
            return -1;
        }
    }

    /* Otherwise, PIN entry is necessary for login, so fail if there's
     * no callback. */
    if (!prov->pin_fn) {
        NE_DEBUG(NE_DBG_SSL, "pk11: No pin callback but login required.\n");
        /* TODO: propagate error. */
        return -1;
    }

    terminate_string(sinfo->slot_description, sizeof sinfo->slot_description);

    do {
        char pin[NE_SSL_P11PINLEN];
        unsigned int flags = 0;

        /* If login has been attempted once already, check the token
         * status again, the flags might change. */
        if (attempt) {
            if (pakchois_get_token_info(prov->module, slot_id, 
                                        &tinfo) != CKR_OK) {
                NE_DEBUG(NE_DBG_SSL, "pk11: GetTokenInfo failed\n");
                /* TODO: propagate error. */
                return -1;
            }
        }

        if (tinfo.flags & CKF_USER_PIN_COUNT_LOW)
            flags |= NE_SSL_P11PIN_COUNT_LOW;
        if (tinfo.flags & CKF_USER_PIN_FINAL_TRY)
            flags |= NE_SSL_P11PIN_FINAL_TRY;
        
        terminate_string(tinfo.label, sizeof tinfo.label);

        if (prov->pin_fn(prov->pin_data, attempt++,
                         (char *)sinfo->slot_description,
                         (char *)tinfo.label, flags, pin)) {
            return -1;
        }

        rv = pakchois_login(pks, CKU_USER, (unsigned char *)pin, strlen(pin));
        
        /* Try to scrub the pin off the stack.  Clever compilers will
         * probably optimize this away, oh well. */
        memset(pin, 0, sizeof pin);
    } while (rv == CKR_PIN_INCORRECT);

    NE_DEBUG(NE_DBG_SSL, "pk11: Login result = %lu\n", rv);

    return (rv == CKR_OK || rv == CKR_USER_ALREADY_LOGGED_IN) ? 0 : -1;
}

static void pk11_provide(void *userdata, ne_session *sess,
                         const ne_ssl_dname *const *dnames,
                         int dncount)
{
    ne_ssl_pkcs11_provider *prov = userdata;
    ck_slot_id_t *slots;
    unsigned long scount, n;

    if (prov->clicert) {
        NE_DEBUG(NE_DBG_SSL, "pk11: Using existing clicert.\n");
        ne_ssl_set_clicert(sess, prov->clicert);
        return;
    }

    if (pakchois_get_slot_list(prov->module, 1, NULL, &scount) != CKR_OK
        || scount == 0) {
        NE_DEBUG(NE_DBG_SSL, "pk11: No slots.\n");
        /* TODO: propagate error. */
        return;
    }

    slots = ne_malloc(scount * sizeof *slots);
    if (pakchois_get_slot_list(prov->module, 1, slots, &scount) != CKR_OK)  {
        ne_free(slots);
        NE_DEBUG(NE_DBG_SSL, "pk11: Really, no slots?\n");
        /* TODO: propagate error. */
        return;
    }

    NE_DEBUG(NE_DBG_SSL, "pk11: Found %ld slots.\n", scount);

    for (n = 0; n < scount; n++) {
        pakchois_session_t *pks;
        ck_rv_t rv;
        struct ck_slot_info sinfo;

        if (pakchois_get_slot_info(prov->module, slots[n], &sinfo) != CKR_OK) {
            NE_DEBUG(NE_DBG_SSL, "pk11: GetSlotInfo failed\n");
            continue;
        }

        if ((sinfo.flags & CKF_TOKEN_PRESENT) == 0) {
            NE_DEBUG(NE_DBG_SSL, "pk11: slot empty, ignoring\n");
            continue;
        }
        
        rv = pakchois_open_session(prov->module, slots[n], 
                                   CKF_SERIAL_SESSION,
                                   NULL, NULL, &pks);
        if (rv != CKR_OK) {
            NE_DEBUG(NE_DBG_SSL, "pk11: could not open slot, %ld (%ld: %ld)\n", 
                     rv, n, slots[n]);
            continue;
        }

        if (pk11_login(prov, slots[n], pks, &sinfo) == 0) {
            if (find_client_cert(prov, pks)) {
                NE_DEBUG(NE_DBG_SSL, "pk11: Setup complete.\n");
                prov->session = pks;
                ne_ssl_set_clicert(sess, prov->clicert);
                ne_free(slots);
                return;
            }
        }

        pakchois_close_session(pks);
    }

    ne_free(slots);
}

static int pk11_init(ne_ssl_pkcs11_provider **provider,
                     pakchois_module_t *module)
{
    ne_ssl_pkcs11_provider *prov;

    prov = *provider = ne_calloc(sizeof *prov);
    prov->module = module;
    prov->privkey = CK_INVALID_HANDLE;

#ifdef HAVE_OPENSSL
    prov->method = pk11_rsa_method(prov);
#endif    
    
    return NE_PK11_OK;
}

int ne_ssl_pkcs11_provider_init(ne_ssl_pkcs11_provider **provider,
                                const char *name)
{
    pakchois_module_t *pm;
    
    if (pakchois_module_load(&pm, name) == CKR_OK) {
        return pk11_init(provider, pm);
    }
    else {
        return NE_PK11_FAILED;
    }
}

int ne_ssl_pkcs11_nss_provider_init(ne_ssl_pkcs11_provider **provider,
                                    const char *name, const char *directory,
                                    const char *cert_prefix, 
                                    const char *key_prefix,
                                    const char *secmod_db)
{
    pakchois_module_t *pm;
    
    if (pakchois_module_nssload(&pm, name, directory, cert_prefix,
                                key_prefix, secmod_db) == CKR_OK) {
        return pk11_init(provider, pm);
    }
    else {
        return NE_PK11_FAILED;
    }
}

void ne_ssl_pkcs11_provider_pin(ne_ssl_pkcs11_provider *provider,
                                ne_ssl_pkcs11_pin_fn fn,
                                void *userdata)
{
    provider->pin_fn = fn;
    provider->pin_data = userdata;
}

void ne_ssl_set_pkcs11_provider(ne_session *sess, 
                                ne_ssl_pkcs11_provider *provider)
{
    ne_ssl_provide_clicert(sess, pk11_provide, provider);
}

void ne_ssl_pkcs11_provider_destroy(ne_ssl_pkcs11_provider *prov)
{
    if (prov->session) {
        pakchois_close_session(prov->session);
    }
    if (prov->clicert) {
        ne_ssl_clicert_free(prov->clicert);
    }
    pakchois_module_destroy(prov->module);
#ifdef HAVE_OPENSSL
    RSA_meth_free(prov->method);
#endif
    ne_free(prov);
}

#else /* !HAVE_PAKCHOIS */

int ne_ssl_pkcs11_provider_init(ne_ssl_pkcs11_provider **provider,
                                const char *name)
{
    return NE_PK11_NOTIMPL;
}

int ne_ssl_pkcs11_nss_provider_init(ne_ssl_pkcs11_provider **provider,
                                    const char *name, const char *directory,
                                    const char *cert_prefix, 
                                    const char *key_prefix,
                                    const char *secmod_db)
{
    return NE_PK11_NOTIMPL;
}

void ne_ssl_pkcs11_provider_destroy(ne_ssl_pkcs11_provider *provider) { }

void ne_ssl_pkcs11_provider_pin(ne_ssl_pkcs11_provider *provider,
                                ne_ssl_pkcs11_pin_fn fn,
                                void *userdata) { }

void ne_ssl_set_pkcs11_provider(ne_session *sess,
                                ne_ssl_pkcs11_provider *provider) { }

#endif /* HAVE_PAKCHOIS */