summaryrefslogtreecommitdiffstats
path: root/security/nss/lib/dev/ckhelper.c
blob: 8ebf58fabde21c95514416652b6d0b312b68e98b (plain)
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
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "pkcs11.h"

#ifndef DEVM_H
#include "devm.h"
#endif /* DEVM_H */

#ifndef CKHELPER_H
#include "ckhelper.h"
#endif /* CKHELPER_H */

extern const NSSError NSS_ERROR_DEVICE_ERROR;

static const CK_BBOOL s_true = CK_TRUE;
NSS_IMPLEMENT_DATA const NSSItem
    g_ck_true = { (CK_VOID_PTR)&s_true, sizeof(s_true) };

static const CK_BBOOL s_false = CK_FALSE;
NSS_IMPLEMENT_DATA const NSSItem
    g_ck_false = { (CK_VOID_PTR)&s_false, sizeof(s_false) };

static const CK_OBJECT_CLASS s_class_cert = CKO_CERTIFICATE;
NSS_IMPLEMENT_DATA const NSSItem
    g_ck_class_cert = { (CK_VOID_PTR)&s_class_cert, sizeof(s_class_cert) };

static const CK_OBJECT_CLASS s_class_pubkey = CKO_PUBLIC_KEY;
NSS_IMPLEMENT_DATA const NSSItem
    g_ck_class_pubkey = { (CK_VOID_PTR)&s_class_pubkey, sizeof(s_class_pubkey) };

static const CK_OBJECT_CLASS s_class_privkey = CKO_PRIVATE_KEY;
NSS_IMPLEMENT_DATA const NSSItem
    g_ck_class_privkey = { (CK_VOID_PTR)&s_class_privkey, sizeof(s_class_privkey) };

static PRBool
is_string_attribute(
    CK_ATTRIBUTE_TYPE aType)
{
    PRBool isString;
    switch (aType) {
        case CKA_LABEL:
        case CKA_NSS_EMAIL:
            isString = PR_TRUE;
            break;
        default:
            isString = PR_FALSE;
            break;
    }
    return isString;
}

NSS_IMPLEMENT PRStatus
nssCKObject_GetAttributes(
    CK_OBJECT_HANDLE object,
    CK_ATTRIBUTE_PTR obj_template,
    CK_ULONG count,
    NSSArena *arenaOpt,
    nssSession *session,
    NSSSlot *slot)
{
    nssArenaMark *mark = NULL;
    CK_SESSION_HANDLE hSession;
    CK_ULONG i = 0;
    CK_RV ckrv;
    PRStatus nssrv;
    PRBool alloced = PR_FALSE;
    void *epv = nssSlot_GetCryptokiEPV(slot);
    hSession = session->handle;
    if (arenaOpt) {
        mark = nssArena_Mark(arenaOpt);
        if (!mark) {
            goto loser;
        }
    }
    nssSession_EnterMonitor(session);
    /* XXX kinda hacky, if the storage size is already in the first template
     * item, then skip the alloc portion
     */
    if (obj_template[0].ulValueLen == 0) {
        /* Get the storage size needed for each attribute */
        ckrv = CKAPI(epv)->C_GetAttributeValue(hSession,
                                               object, obj_template, count);
        if (ckrv != CKR_OK &&
            ckrv != CKR_ATTRIBUTE_TYPE_INVALID &&
            ckrv != CKR_ATTRIBUTE_SENSITIVE) {
            nssSession_ExitMonitor(session);
            nss_SetError(NSS_ERROR_DEVICE_ERROR);
            goto loser;
        }
        /* Allocate memory for each attribute. */
        for (i = 0; i < count; i++) {
            CK_ULONG ulValueLen = obj_template[i].ulValueLen;
            if (ulValueLen == 0 || ulValueLen == (CK_ULONG)-1) {
                obj_template[i].pValue = NULL;
                obj_template[i].ulValueLen = 0;
                continue;
            }
            if (is_string_attribute(obj_template[i].type)) {
                ulValueLen++;
            }
            obj_template[i].pValue = nss_ZAlloc(arenaOpt, ulValueLen);
            if (!obj_template[i].pValue) {
                nssSession_ExitMonitor(session);
                goto loser;
            }
        }
        alloced = PR_TRUE;
    }
    /* Obtain the actual attribute values. */
    ckrv = CKAPI(epv)->C_GetAttributeValue(hSession,
                                           object, obj_template, count);
    nssSession_ExitMonitor(session);
    if (ckrv != CKR_OK &&
        ckrv != CKR_ATTRIBUTE_TYPE_INVALID &&
        ckrv != CKR_ATTRIBUTE_SENSITIVE) {
        nss_SetError(NSS_ERROR_DEVICE_ERROR);
        goto loser;
    }
    if (alloced && arenaOpt) {
        nssrv = nssArena_Unmark(arenaOpt, mark);
        if (nssrv != PR_SUCCESS) {
            goto loser;
        }
    }

    if (count > 1 && ((ckrv == CKR_ATTRIBUTE_TYPE_INVALID) ||
                      (ckrv == CKR_ATTRIBUTE_SENSITIVE))) {
        /* old tokens would keep the length of '0' and not deal with any
         * of the attributes we passed. For those tokens read them one at
         * a time */
        for (i = 0; i < count; i++) {
            if ((obj_template[i].ulValueLen == 0) ||
                (obj_template[i].ulValueLen == -1)) {
                obj_template[i].ulValueLen = 0;
                (void)nssCKObject_GetAttributes(object, &obj_template[i], 1,
                                                arenaOpt, session, slot);
            }
        }
    }
    return PR_SUCCESS;
loser:
    if (alloced) {
        if (arenaOpt) {
            /* release all arena memory allocated before the failure. */
            (void)nssArena_Release(arenaOpt, mark);
        } else {
            CK_ULONG j;
            /* free each heap object that was allocated before the failure. */
            for (j = 0; j < i; j++) {
                nss_ZFreeIf(obj_template[j].pValue);
            }
        }
    }
    return PR_FAILURE;
}

NSS_IMPLEMENT PRStatus
nssCKObject_GetAttributeItem(
    CK_OBJECT_HANDLE object,
    CK_ATTRIBUTE_TYPE attribute,
    NSSArena *arenaOpt,
    nssSession *session,
    NSSSlot *slot,
    NSSItem *rvItem)
{
    CK_ATTRIBUTE attr = { 0, NULL, 0 };
    PRStatus nssrv;
    attr.type = attribute;
    nssrv = nssCKObject_GetAttributes(object, &attr, 1,
                                      arenaOpt, session, slot);
    if (nssrv != PR_SUCCESS) {
        return nssrv;
    }
    rvItem->data = (void *)attr.pValue;
    rvItem->size = (PRUint32)attr.ulValueLen;
    return PR_SUCCESS;
}

NSS_IMPLEMENT PRBool
nssCKObject_IsAttributeTrue(
    CK_OBJECT_HANDLE object,
    CK_ATTRIBUTE_TYPE attribute,
    nssSession *session,
    NSSSlot *slot,
    PRStatus *rvStatus)
{
    CK_BBOOL bool;
    CK_ATTRIBUTE_PTR attr;
    CK_ATTRIBUTE atemplate = { 0, NULL, 0 };
    CK_RV ckrv;
    void *epv = nssSlot_GetCryptokiEPV(slot);
    attr = &atemplate;
    NSS_CK_SET_ATTRIBUTE_VAR(attr, attribute, bool);
    nssSession_EnterMonitor(session);
    ckrv = CKAPI(epv)->C_GetAttributeValue(session->handle, object,
                                           &atemplate, 1);
    nssSession_ExitMonitor(session);
    if (ckrv != CKR_OK) {
        *rvStatus = PR_FAILURE;
        return PR_FALSE;
    }
    *rvStatus = PR_SUCCESS;
    return (PRBool)(bool == CK_TRUE);
}

NSS_IMPLEMENT PRStatus
nssCKObject_SetAttributes(
    CK_OBJECT_HANDLE object,
    CK_ATTRIBUTE_PTR obj_template,
    CK_ULONG count,
    nssSession *session,
    NSSSlot *slot)
{
    CK_RV ckrv;
    void *epv = nssSlot_GetCryptokiEPV(slot);
    nssSession_EnterMonitor(session);
    ckrv = CKAPI(epv)->C_SetAttributeValue(session->handle, object,
                                           obj_template, count);
    nssSession_ExitMonitor(session);
    if (ckrv == CKR_OK) {
        return PR_SUCCESS;
    } else {
        return PR_FAILURE;
    }
}

NSS_IMPLEMENT PRBool
nssCKObject_IsTokenObjectTemplate(
    CK_ATTRIBUTE_PTR objectTemplate,
    CK_ULONG otsize)
{
    CK_ULONG ul;
    for (ul = 0; ul < otsize; ul++) {
        if (objectTemplate[ul].type == CKA_TOKEN) {
            return (*((CK_BBOOL *)objectTemplate[ul].pValue) == CK_TRUE);
        }
    }
    return PR_FALSE;
}

static NSSCertificateType
nss_cert_type_from_ck_attrib(CK_ATTRIBUTE_PTR attrib)
{
    CK_CERTIFICATE_TYPE ckCertType;
    if (!attrib->pValue) {
        /* default to PKIX */
        return NSSCertificateType_PKIX;
    }
    ckCertType = *((CK_ULONG *)attrib->pValue);
    switch (ckCertType) {
        case CKC_X_509:
            return NSSCertificateType_PKIX;
        default:
            break;
    }
    return NSSCertificateType_Unknown;
}

/* incoming pointers must be valid */
NSS_IMPLEMENT PRStatus
nssCryptokiCertificate_GetAttributes(
    nssCryptokiObject *certObject,
    nssSession *sessionOpt,
    NSSArena *arenaOpt,
    NSSCertificateType *certTypeOpt,
    NSSItem *idOpt,
    NSSDER *encodingOpt,
    NSSDER *issuerOpt,
    NSSDER *serialOpt,
    NSSDER *subjectOpt)
{
    PRStatus status;
    PRUint32 i;
    nssSession *session;
    NSSSlot *slot;
    CK_ULONG template_size;
    CK_ATTRIBUTE_PTR attr;
    CK_ATTRIBUTE cert_template[6];
    /* Set up a template of all options chosen by caller */
    NSS_CK_TEMPLATE_START(cert_template, attr, template_size);
    if (certTypeOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_CERTIFICATE_TYPE);
    }
    if (idOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_ID);
    }
    if (encodingOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_VALUE);
    }
    if (issuerOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_ISSUER);
    }
    if (serialOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_SERIAL_NUMBER);
    }
    if (subjectOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_SUBJECT);
    }
    NSS_CK_TEMPLATE_FINISH(cert_template, attr, template_size);
    if (template_size == 0) {
        /* caller didn't want anything */
        return PR_SUCCESS;
    }

    status = nssToken_GetCachedObjectAttributes(certObject->token, arenaOpt,
                                                certObject, CKO_CERTIFICATE,
                                                cert_template, template_size);
    if (status != PR_SUCCESS) {

        session = sessionOpt ? sessionOpt
                             : nssToken_GetDefaultSession(certObject->token);
        if (!session) {
            nss_SetError(NSS_ERROR_INVALID_ARGUMENT);
            return PR_FAILURE;
        }

        slot = nssToken_GetSlot(certObject->token);
        status = nssCKObject_GetAttributes(certObject->handle,
                                           cert_template, template_size,
                                           arenaOpt, session, slot);
        nssSlot_Destroy(slot);
        if (status != PR_SUCCESS) {
            return status;
        }
    }

    i = 0;
    if (certTypeOpt) {
        *certTypeOpt = nss_cert_type_from_ck_attrib(&cert_template[i]);
        i++;
    }
    if (idOpt) {
        NSS_CK_ATTRIBUTE_TO_ITEM(&cert_template[i], idOpt);
        i++;
    }
    if (encodingOpt) {
        NSS_CK_ATTRIBUTE_TO_ITEM(&cert_template[i], encodingOpt);
        i++;
    }
    if (issuerOpt) {
        NSS_CK_ATTRIBUTE_TO_ITEM(&cert_template[i], issuerOpt);
        i++;
    }
    if (serialOpt) {
        NSS_CK_ATTRIBUTE_TO_ITEM(&cert_template[i], serialOpt);
        i++;
    }
    if (subjectOpt) {
        NSS_CK_ATTRIBUTE_TO_ITEM(&cert_template[i], subjectOpt);
        i++;
    }
    return PR_SUCCESS;
}

static nssTrustLevel
get_nss_trust(
    CK_TRUST ckt)
{
    nssTrustLevel t;
    switch (ckt) {
        case CKT_NSS_NOT_TRUSTED:
            t = nssTrustLevel_NotTrusted;
            break;
        case CKT_NSS_TRUSTED_DELEGATOR:
            t = nssTrustLevel_TrustedDelegator;
            break;
        case CKT_NSS_VALID_DELEGATOR:
            t = nssTrustLevel_ValidDelegator;
            break;
        case CKT_NSS_TRUSTED:
            t = nssTrustLevel_Trusted;
            break;
        case CKT_NSS_MUST_VERIFY_TRUST:
            t = nssTrustLevel_MustVerify;
            break;
        case CKT_NSS_TRUST_UNKNOWN:
        default:
            t = nssTrustLevel_Unknown;
            break;
    }
    return t;
}

NSS_IMPLEMENT PRStatus
nssCryptokiTrust_GetAttributes(
    nssCryptokiObject *trustObject,
    nssSession *sessionOpt,
    NSSItem *sha1_hash,
    nssTrustLevel *serverAuth,
    nssTrustLevel *clientAuth,
    nssTrustLevel *codeSigning,
    nssTrustLevel *emailProtection,
    PRBool *stepUpApproved)
{
    PRStatus status;
    NSSSlot *slot;
    nssSession *session;
    CK_BBOOL isToken = PR_FALSE;
    /* default values if the trust is record does not exist. In the highly
     * unlikely case that these change, be sure to update softoken's
     * 'sftkdb_isNullTrust()' function */
    CK_BBOOL stepUp = PR_FALSE;
    CK_TRUST saTrust = CKT_NSS_TRUST_UNKNOWN;
    CK_TRUST caTrust = CKT_NSS_TRUST_UNKNOWN;
    CK_TRUST epTrust = CKT_NSS_TRUST_UNKNOWN;
    CK_TRUST csTrust = CKT_NSS_TRUST_UNKNOWN;
    CK_ATTRIBUTE_PTR attr;
    CK_ATTRIBUTE trust_template[7];
    CK_ATTRIBUTE_PTR sha1_hash_attr;
    CK_ULONG trust_size;

    /* Use the trust object to find the trust settings */
    NSS_CK_TEMPLATE_START(trust_template, attr, trust_size);
    NSS_CK_SET_ATTRIBUTE_VAR(attr, CKA_TOKEN, isToken);
    NSS_CK_SET_ATTRIBUTE_VAR(attr, CKA_TRUST_SERVER_AUTH, saTrust);
    NSS_CK_SET_ATTRIBUTE_VAR(attr, CKA_TRUST_CLIENT_AUTH, caTrust);
    NSS_CK_SET_ATTRIBUTE_VAR(attr, CKA_TRUST_EMAIL_PROTECTION, epTrust);
    NSS_CK_SET_ATTRIBUTE_VAR(attr, CKA_TRUST_CODE_SIGNING, csTrust);
    NSS_CK_SET_ATTRIBUTE_VAR(attr, CKA_TRUST_STEP_UP_APPROVED, stepUp);
    sha1_hash_attr = attr;
    NSS_CK_SET_ATTRIBUTE_ITEM(attr, CKA_CERT_SHA1_HASH, sha1_hash);
    NSS_CK_TEMPLATE_FINISH(trust_template, attr, trust_size);

    status = nssToken_GetCachedObjectAttributes(trustObject->token, NULL,
                                                trustObject,
                                                CKO_NSS_TRUST,
                                                trust_template, trust_size);
    if (status != PR_SUCCESS) {
        session = sessionOpt ? sessionOpt
                             : nssToken_GetDefaultSession(trustObject->token);
        if (!session) {
            nss_SetError(NSS_ERROR_INVALID_ARGUMENT);
            return PR_FAILURE;
        }

        slot = nssToken_GetSlot(trustObject->token);
        status = nssCKObject_GetAttributes(trustObject->handle,
                                           trust_template, trust_size,
                                           NULL, session, slot);
        nssSlot_Destroy(slot);
        if (status != PR_SUCCESS) {
            return status;
        }
    }

    if (sha1_hash_attr->ulValueLen == -1) {
        /* The trust object does not have the CKA_CERT_SHA1_HASH attribute. */
        sha1_hash_attr->ulValueLen = 0;
    }
    sha1_hash->size = sha1_hash_attr->ulValueLen;
    *serverAuth = get_nss_trust(saTrust);
    *clientAuth = get_nss_trust(caTrust);
    *emailProtection = get_nss_trust(epTrust);
    *codeSigning = get_nss_trust(csTrust);
    *stepUpApproved = stepUp;
    return PR_SUCCESS;
}

NSS_IMPLEMENT PRStatus
nssCryptokiCRL_GetAttributes(
    nssCryptokiObject *crlObject,
    nssSession *sessionOpt,
    NSSArena *arenaOpt,
    NSSItem *encodingOpt,
    NSSItem *subjectOpt,
    CK_ULONG *crl_class,
    NSSUTF8 **urlOpt,
    PRBool *isKRLOpt)
{
    PRStatus status;
    NSSSlot *slot;
    nssSession *session;
    CK_ATTRIBUTE_PTR attr;
    CK_ATTRIBUTE crl_template[7];
    CK_ULONG crl_size;
    PRUint32 i;

    NSS_CK_TEMPLATE_START(crl_template, attr, crl_size);
    if (crl_class) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_CLASS);
    }
    if (encodingOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_VALUE);
    }
    if (urlOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_NSS_URL);
    }
    if (isKRLOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_NSS_KRL);
    }
    if (subjectOpt) {
        NSS_CK_SET_ATTRIBUTE_NULL(attr, CKA_SUBJECT);
    }
    NSS_CK_TEMPLATE_FINISH(crl_template, attr, crl_size);

    status = nssToken_GetCachedObjectAttributes(crlObject->token, NULL,
                                                crlObject,
                                                CKO_NSS_CRL,
                                                crl_template, crl_size);
    if (status != PR_SUCCESS) {
        session = sessionOpt ? sessionOpt
                             : nssToken_GetDefaultSession(crlObject->token);
        if (session == NULL) {
            nss_SetError(NSS_ERROR_INVALID_ARGUMENT);
            return PR_FAILURE;
        }

        slot = nssToken_GetSlot(crlObject->token);
        status = nssCKObject_GetAttributes(crlObject->handle,
                                           crl_template, crl_size,
                                           arenaOpt, session, slot);
        nssSlot_Destroy(slot);
        if (status != PR_SUCCESS) {
            return status;
        }
    }

    i = 0;
    if (crl_class) {
        NSS_CK_ATTRIBUTE_TO_ULONG(&crl_template[i], *crl_class);
        i++;
    }
    if (encodingOpt) {
        NSS_CK_ATTRIBUTE_TO_ITEM(&crl_template[i], encodingOpt);
        i++;
    }
    if (urlOpt) {
        NSS_CK_ATTRIBUTE_TO_UTF8(&crl_template[i], *urlOpt);
        i++;
    }
    if (isKRLOpt) {
        NSS_CK_ATTRIBUTE_TO_BOOL(&crl_template[i], *isKRLOpt);
        i++;
    }
    if (subjectOpt) {
        NSS_CK_ATTRIBUTE_TO_ITEM(&crl_template[i], subjectOpt);
        i++;
    }
    return PR_SUCCESS;
}

NSS_IMPLEMENT PRStatus
nssCryptokiPrivateKey_SetCertificate(
    nssCryptokiObject *keyObject,
    nssSession *sessionOpt,
    const NSSUTF8 *nickname,
    NSSItem *id,
    NSSDER *subject)
{
    CK_RV ckrv;
    CK_ATTRIBUTE_PTR attr;
    CK_ATTRIBUTE key_template[3];
    CK_ULONG key_size;
    void *epv = nssToken_GetCryptokiEPV(keyObject->token);
    nssSession *session;
    NSSToken *token = keyObject->token;
    nssSession *defaultSession = nssToken_GetDefaultSession(token);
    PRBool createdSession = PR_FALSE;

    NSS_CK_TEMPLATE_START(key_template, attr, key_size);
    NSS_CK_SET_ATTRIBUTE_UTF8(attr, CKA_LABEL, nickname);
    NSS_CK_SET_ATTRIBUTE_ITEM(attr, CKA_ID, id);
    NSS_CK_SET_ATTRIBUTE_ITEM(attr, CKA_SUBJECT, subject);
    NSS_CK_TEMPLATE_FINISH(key_template, attr, key_size);

    if (sessionOpt) {
        if (!nssSession_IsReadWrite(sessionOpt)) {
            return PR_FAILURE;
        }
        session = sessionOpt;
    } else if (defaultSession && nssSession_IsReadWrite(defaultSession)) {
        session = defaultSession;
    } else {
        NSSSlot *slot = nssToken_GetSlot(token);
        session = nssSlot_CreateSession(token->slot, NULL, PR_TRUE);
        nssSlot_Destroy(slot);
        if (!session) {
            return PR_FAILURE;
        }
        createdSession = PR_TRUE;
    }

    ckrv = CKAPI(epv)->C_SetAttributeValue(session->handle,
                                           keyObject->handle,
                                           key_template,
                                           key_size);

    if (createdSession) {
        nssSession_Destroy(session);
    }

    return (ckrv == CKR_OK) ? PR_SUCCESS : PR_FAILURE;
}