summaryrefslogtreecommitdiff
path: root/ssh-pkcs11.c
blob: ea97508f125e4c99ebce2ea3cff3b43252548b90 (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
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
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
/* $OpenBSD: ssh-pkcs11.c,v 1.24 2017/05/30 14:15:17 markus Exp $ */
/*
 * Copyright (c) 2010 Markus Friedl.  All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "includes.h"

#ifdef ENABLE_PKCS11

#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <stdarg.h>
#include <stdio.h>

#include <string.h>
#include <dlfcn.h>

#include "openbsd-compat/sys-queue.h"

#include <openssl/x509.h>

#define CRYPTOKI_COMPAT
#include "pkcs11.h"

#include "log.h"
#include "misc.h"
#include "sshkey.h"
#include "ssh-pkcs11.h"
#include "xmalloc.h"

struct pkcs11_slotinfo {
	CK_TOKEN_INFO		token;
	CK_SESSION_HANDLE	session;
	int			logged_in;
};

struct pkcs11_provider {
	char			*name;
	void			*handle;
	CK_FUNCTION_LIST	*function_list;
	CK_INFO			info;
	CK_ULONG		nslots;
	CK_SLOT_ID		*slotlist;
	struct pkcs11_slotinfo	*slotinfo;
	int			valid;
	int			refcount;
	TAILQ_ENTRY(pkcs11_provider) next;
};

TAILQ_HEAD(, pkcs11_provider) pkcs11_providers;

struct pkcs11_key {
	struct pkcs11_provider	*provider;
	CK_ULONG		slotidx;
	int			(*orig_finish)(RSA *rsa);
	RSA_METHOD		rsa_method;
	char			*keyid;
	int			keyid_len;
};

int pkcs11_interactive = 0;

int
pkcs11_init(int interactive)
{
	pkcs11_interactive = interactive;
	TAILQ_INIT(&pkcs11_providers);
	return (0);
}

/*
 * finalize a provider shared libarary, it's no longer usable.
 * however, there might still be keys referencing this provider,
 * so the actuall freeing of memory is handled by pkcs11_provider_unref().
 * this is called when a provider gets unregistered.
 */
static void
pkcs11_provider_finalize(struct pkcs11_provider *p)
{
	CK_RV rv;
	CK_ULONG i;

	debug("pkcs11_provider_finalize: %p refcount %d valid %d",
	    p, p->refcount, p->valid);
	if (!p->valid)
		return;
	for (i = 0; i < p->nslots; i++) {
		if (p->slotinfo[i].session &&
		    (rv = p->function_list->C_CloseSession(
		    p->slotinfo[i].session)) != CKR_OK)
			error("C_CloseSession failed: %lu", rv);
	}
	if ((rv = p->function_list->C_Finalize(NULL)) != CKR_OK)
		error("C_Finalize failed: %lu", rv);
	p->valid = 0;
	p->function_list = NULL;
	dlclose(p->handle);
}

/*
 * remove a reference to the provider.
 * called when a key gets destroyed or when the provider is unregistered.
 */
static void
pkcs11_provider_unref(struct pkcs11_provider *p)
{
	debug("pkcs11_provider_unref: %p refcount %d", p, p->refcount);
	if (--p->refcount <= 0) {
		if (p->valid)
			error("pkcs11_provider_unref: %p still valid", p);
		free(p->slotlist);
		free(p->slotinfo);
		free(p);
	}
}

/* unregister all providers, keys might still point to the providers */
void
pkcs11_terminate(void)
{
	struct pkcs11_provider *p;

	while ((p = TAILQ_FIRST(&pkcs11_providers)) != NULL) {
		TAILQ_REMOVE(&pkcs11_providers, p, next);
		pkcs11_provider_finalize(p);
		pkcs11_provider_unref(p);
	}
}

/* lookup provider by name */
static struct pkcs11_provider *
pkcs11_provider_lookup(char *provider_id)
{
	struct pkcs11_provider *p;

	TAILQ_FOREACH(p, &pkcs11_providers, next) {
		debug("check %p %s", p, p->name);
		if (!strcmp(provider_id, p->name))
			return (p);
	}
	return (NULL);
}

/* unregister provider by name */
int
pkcs11_del_provider(char *provider_id)
{
	struct pkcs11_provider *p;

	if ((p = pkcs11_provider_lookup(provider_id)) != NULL) {
		TAILQ_REMOVE(&pkcs11_providers, p, next);
		pkcs11_provider_finalize(p);
		pkcs11_provider_unref(p);
		return (0);
	}
	return (-1);
}

/* openssl callback for freeing an RSA key */
static int
pkcs11_rsa_finish(RSA *rsa)
{
	struct pkcs11_key	*k11;
	int rv = -1;

	if ((k11 = RSA_get_app_data(rsa)) != NULL) {
		if (k11->orig_finish)
			rv = k11->orig_finish(rsa);
		if (k11->provider)
			pkcs11_provider_unref(k11->provider);
		free(k11->keyid);
		free(k11);
	}
	return (rv);
}

/* find a single 'obj' for given attributes */
static int
pkcs11_find(struct pkcs11_provider *p, CK_ULONG slotidx, CK_ATTRIBUTE *attr,
    CK_ULONG nattr, CK_OBJECT_HANDLE *obj)
{
	CK_FUNCTION_LIST	*f;
	CK_SESSION_HANDLE	session;
	CK_ULONG		nfound = 0;
	CK_RV			rv;
	int			ret = -1;

	f = p->function_list;
	session = p->slotinfo[slotidx].session;
	if ((rv = f->C_FindObjectsInit(session, attr, nattr)) != CKR_OK) {
		error("C_FindObjectsInit failed (nattr %lu): %lu", nattr, rv);
		return (-1);
	}
	if ((rv = f->C_FindObjects(session, obj, 1, &nfound)) != CKR_OK ||
	    nfound != 1) {
		debug("C_FindObjects failed (nfound %lu nattr %lu): %lu",
		    nfound, nattr, rv);
	} else
		ret = 0;
	if ((rv = f->C_FindObjectsFinal(session)) != CKR_OK)
		error("C_FindObjectsFinal failed: %lu", rv);
	return (ret);
}

/* openssl callback doing the actual signing operation */
static int
pkcs11_rsa_private_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
    int padding)
{
	struct pkcs11_key	*k11;
	struct pkcs11_slotinfo	*si;
	CK_FUNCTION_LIST	*f;
	CK_OBJECT_HANDLE	obj;
	CK_ULONG		tlen = 0;
	CK_RV			rv;
	CK_OBJECT_CLASS	private_key_class = CKO_PRIVATE_KEY;
	CK_BBOOL		true_val = CK_TRUE;
	CK_MECHANISM		mech = {
		CKM_RSA_PKCS, NULL_PTR, 0
	};
	CK_ATTRIBUTE		key_filter[] = {
		{CKA_CLASS, NULL, sizeof(private_key_class) },
		{CKA_ID, NULL, 0},
		{CKA_SIGN, NULL, sizeof(true_val) }
	};
	char			*pin = NULL, prompt[1024];
	int			rval = -1;

	key_filter[0].pValue = &private_key_class;
	key_filter[2].pValue = &true_val;

	if ((k11 = RSA_get_app_data(rsa)) == NULL) {
		error("RSA_get_app_data failed for rsa %p", rsa);
		return (-1);
	}
	if (!k11->provider || !k11->provider->valid) {
		error("no pkcs11 (valid) provider for rsa %p", rsa);
		return (-1);
	}
	f = k11->provider->function_list;
	si = &k11->provider->slotinfo[k11->slotidx];
	if ((si->token.flags & CKF_LOGIN_REQUIRED) && !si->logged_in) {
		if (!pkcs11_interactive) {
			error("need pin entry%s", (si->token.flags &
			    CKF_PROTECTED_AUTHENTICATION_PATH) ?
			    " on reader keypad" : "");
			return (-1);
		}
		if (si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH)
			verbose("Deferring PIN entry to reader keypad.");
		else {
			snprintf(prompt, sizeof(prompt),
			    "Enter PIN for '%s': ", si->token.label);
			pin = read_passphrase(prompt, RP_ALLOW_EOF);
			if (pin == NULL)
				return (-1);	/* bail out */
		}
		rv = f->C_Login(si->session, CKU_USER, (u_char *)pin,
		    (pin != NULL) ? strlen(pin) : 0);
		if (pin != NULL) {
			explicit_bzero(pin, strlen(pin));
			free(pin);
		}
		if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
			error("C_Login failed: %lu", rv);
			return (-1);
		}
		si->logged_in = 1;
	}
	key_filter[1].pValue = k11->keyid;
	key_filter[1].ulValueLen = k11->keyid_len;
	/* try to find object w/CKA_SIGN first, retry w/o */
	if (pkcs11_find(k11->provider, k11->slotidx, key_filter, 3, &obj) < 0 &&
	    pkcs11_find(k11->provider, k11->slotidx, key_filter, 2, &obj) < 0) {
		error("cannot find private key");
	} else if ((rv = f->C_SignInit(si->session, &mech, obj)) != CKR_OK) {
		error("C_SignInit failed: %lu", rv);
	} else {
		/* XXX handle CKR_BUFFER_TOO_SMALL */
		tlen = RSA_size(rsa);
		rv = f->C_Sign(si->session, (CK_BYTE *)from, flen, to, &tlen);
		if (rv == CKR_OK) 
			rval = tlen;
		else 
			error("C_Sign failed: %lu", rv);
	}
	return (rval);
}

static int
pkcs11_rsa_private_decrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
    int padding)
{
	return (-1);
}

/* redirect private key operations for rsa key to pkcs11 token */
static int
pkcs11_rsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
    CK_ATTRIBUTE *keyid_attrib, RSA *rsa)
{
	struct pkcs11_key	*k11;
	const RSA_METHOD	*def = RSA_get_default_method();

	k11 = xcalloc(1, sizeof(*k11));
	k11->provider = provider;
	provider->refcount++;	/* provider referenced by RSA key */
	k11->slotidx = slotidx;
	/* identify key object on smartcard */
	k11->keyid_len = keyid_attrib->ulValueLen;
	if (k11->keyid_len > 0) {
		k11->keyid = xmalloc(k11->keyid_len);
		memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
	}
	k11->orig_finish = def->finish;
	memcpy(&k11->rsa_method, def, sizeof(k11->rsa_method));
	k11->rsa_method.name = "pkcs11";
	k11->rsa_method.rsa_priv_enc = pkcs11_rsa_private_encrypt;
	k11->rsa_method.rsa_priv_dec = pkcs11_rsa_private_decrypt;
	k11->rsa_method.finish = pkcs11_rsa_finish;
	RSA_set_method(rsa, &k11->rsa_method);
	RSA_set_app_data(rsa, k11);
	return (0);
}

/* remove trailing spaces */
static void
rmspace(u_char *buf, size_t len)
{
	size_t i;

	if (!len)
		return;
	for (i = len - 1;  i > 0; i--)
		if (i == len - 1 || buf[i] == ' ')
			buf[i] = '\0';
		else
			break;
}

/*
 * open a pkcs11 session and login if required.
 * if pin == NULL we delay login until key use
 */
static int
pkcs11_open_session(struct pkcs11_provider *p, CK_ULONG slotidx, char *pin)
{
	CK_RV			rv;
	CK_FUNCTION_LIST	*f;
	CK_SESSION_HANDLE	session;
	int			login_required;

	f = p->function_list;
	login_required = p->slotinfo[slotidx].token.flags & CKF_LOGIN_REQUIRED;
	if (pin && login_required && !strlen(pin)) {
		error("pin required");
		return (-1);
	}
	if ((rv = f->C_OpenSession(p->slotlist[slotidx], CKF_RW_SESSION|
	    CKF_SERIAL_SESSION, NULL, NULL, &session))
	    != CKR_OK) {
		error("C_OpenSession failed: %lu", rv);
		return (-1);
	}
	if (login_required && pin) {
		rv = f->C_Login(session, CKU_USER,
		    (u_char *)pin, strlen(pin));
		if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
			error("C_Login failed: %lu", rv);
			if ((rv = f->C_CloseSession(session)) != CKR_OK)
				error("C_CloseSession failed: %lu", rv);
			return (-1);
		}
		p->slotinfo[slotidx].logged_in = 1;
	}
	p->slotinfo[slotidx].session = session;
	return (0);
}

/*
 * lookup public keys for token in slot identified by slotidx,
 * add 'wrapped' public keys to the 'keysp' array and increment nkeys.
 * keysp points to an (possibly empty) array with *nkeys keys.
 */
static int pkcs11_fetch_keys_filter(struct pkcs11_provider *, CK_ULONG,
    CK_ATTRIBUTE [], CK_ATTRIBUTE [3], struct sshkey ***, int *)
	__attribute__((__bounded__(__minbytes__,4, 3 * sizeof(CK_ATTRIBUTE))));

static int
pkcs11_fetch_keys(struct pkcs11_provider *p, CK_ULONG slotidx,
    struct sshkey ***keysp, int *nkeys)
{
	CK_OBJECT_CLASS	pubkey_class = CKO_PUBLIC_KEY;
	CK_OBJECT_CLASS	cert_class = CKO_CERTIFICATE;
	CK_ATTRIBUTE		pubkey_filter[] = {
		{ CKA_CLASS, NULL, sizeof(pubkey_class) }
	};
	CK_ATTRIBUTE		cert_filter[] = {
		{ CKA_CLASS, NULL, sizeof(cert_class) }
	};
	CK_ATTRIBUTE		pubkey_attribs[] = {
		{ CKA_ID, NULL, 0 },
		{ CKA_MODULUS, NULL, 0 },
		{ CKA_PUBLIC_EXPONENT, NULL, 0 }
	};
	CK_ATTRIBUTE		cert_attribs[] = {
		{ CKA_ID, NULL, 0 },
		{ CKA_SUBJECT, NULL, 0 },
		{ CKA_VALUE, NULL, 0 }
	};
	pubkey_filter[0].pValue = &pubkey_class;
	cert_filter[0].pValue = &cert_class;

	if (pkcs11_fetch_keys_filter(p, slotidx, pubkey_filter, pubkey_attribs,
	    keysp, nkeys) < 0 ||
	    pkcs11_fetch_keys_filter(p, slotidx, cert_filter, cert_attribs,
	    keysp, nkeys) < 0)
		return (-1);
	return (0);
}

static int
pkcs11_key_included(struct sshkey ***keysp, int *nkeys, struct sshkey *key)
{
	int i;

	for (i = 0; i < *nkeys; i++)
		if (sshkey_equal(key, (*keysp)[i]))
			return (1);
	return (0);
}

static int
pkcs11_fetch_keys_filter(struct pkcs11_provider *p, CK_ULONG slotidx,
    CK_ATTRIBUTE filter[], CK_ATTRIBUTE attribs[3],
    struct sshkey ***keysp, int *nkeys)
{
	struct sshkey		*key;
	RSA			*rsa;
	X509 			*x509;
	EVP_PKEY		*evp;
	int			i;
	const u_char		*cp;
	CK_RV			rv;
	CK_OBJECT_HANDLE	obj;
	CK_ULONG		nfound;
	CK_SESSION_HANDLE	session;
	CK_FUNCTION_LIST	*f;

	f = p->function_list;
	session = p->slotinfo[slotidx].session;
	/* setup a filter the looks for public keys */
	if ((rv = f->C_FindObjectsInit(session, filter, 1)) != CKR_OK) {
		error("C_FindObjectsInit failed: %lu", rv);
		return (-1);
	}
	while (1) {
		/* XXX 3 attributes in attribs[] */
		for (i = 0; i < 3; i++) {
			attribs[i].pValue = NULL;
			attribs[i].ulValueLen = 0;
		}
		if ((rv = f->C_FindObjects(session, &obj, 1, &nfound)) != CKR_OK
		    || nfound == 0)
			break;
		/* found a key, so figure out size of the attributes */
		if ((rv = f->C_GetAttributeValue(session, obj, attribs, 3))
		    != CKR_OK) {
			error("C_GetAttributeValue failed: %lu", rv);
			continue;
		}
		/*
		 * Allow CKA_ID (always first attribute) to be empty, but
		 * ensure that none of the others are zero length.
		 * XXX assumes CKA_ID is always first.
		 */
		if (attribs[1].ulValueLen == 0 ||
		    attribs[2].ulValueLen == 0) {
			continue;
		}
		/* allocate buffers for attributes */
		for (i = 0; i < 3; i++) {
			if (attribs[i].ulValueLen > 0) {
				attribs[i].pValue = xmalloc(
				    attribs[i].ulValueLen);
			}
		}

		/*
		 * retrieve ID, modulus and public exponent of RSA key,
		 * or ID, subject and value for certificates.
		 */
		rsa = NULL;
		if ((rv = f->C_GetAttributeValue(session, obj, attribs, 3))
		    != CKR_OK) {
			error("C_GetAttributeValue failed: %lu", rv);
		} else if (attribs[1].type == CKA_MODULUS ) {
			if ((rsa = RSA_new()) == NULL) {
				error("RSA_new failed");
			} else {
				rsa->n = BN_bin2bn(attribs[1].pValue,
				    attribs[1].ulValueLen, NULL);
				rsa->e = BN_bin2bn(attribs[2].pValue,
				    attribs[2].ulValueLen, NULL);
			}
		} else {
			cp = attribs[2].pValue;
			if ((x509 = X509_new()) == NULL) {
				error("X509_new failed");
			} else if (d2i_X509(&x509, &cp, attribs[2].ulValueLen)
			    == NULL) {
				error("d2i_X509 failed");
			} else if ((evp = X509_get_pubkey(x509)) == NULL ||
			    evp->type != EVP_PKEY_RSA ||
			    evp->pkey.rsa == NULL) {
				debug("X509_get_pubkey failed or no rsa");
			} else if ((rsa = RSAPublicKey_dup(evp->pkey.rsa))
			    == NULL) {
				error("RSAPublicKey_dup");
			}
			if (x509)
				X509_free(x509);
		}
		if (rsa && rsa->n && rsa->e &&
		    pkcs11_rsa_wrap(p, slotidx, &attribs[0], rsa) == 0) {
			if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
				fatal("sshkey_new failed");
			key->rsa = rsa;
			key->type = KEY_RSA;
			key->flags |= SSHKEY_FLAG_EXT;
			if (pkcs11_key_included(keysp, nkeys, key)) {
				sshkey_free(key);
			} else {
				/* expand key array and add key */
				*keysp = xreallocarray(*keysp, *nkeys + 1,
				    sizeof(struct sshkey *));
				(*keysp)[*nkeys] = key;
				*nkeys = *nkeys + 1;
				debug("have %d keys", *nkeys);
			}
		} else if (rsa) {
			RSA_free(rsa);
		}
		for (i = 0; i < 3; i++)
			free(attribs[i].pValue);
	}
	if ((rv = f->C_FindObjectsFinal(session)) != CKR_OK)
		error("C_FindObjectsFinal failed: %lu", rv);
	return (0);
}

/* register a new provider, fails if provider already exists */
int
pkcs11_add_provider(char *provider_id, char *pin, struct sshkey ***keyp)
{
	int nkeys, need_finalize = 0;
	struct pkcs11_provider *p = NULL;
	void *handle = NULL;
	CK_RV (*getfunctionlist)(CK_FUNCTION_LIST **);
	CK_RV rv;
	CK_FUNCTION_LIST *f = NULL;
	CK_TOKEN_INFO *token;
	CK_ULONG i;

	*keyp = NULL;
	if (pkcs11_provider_lookup(provider_id) != NULL) {
		debug("%s: provider already registered: %s",
		    __func__, provider_id);
		goto fail;
	}
	/* open shared pkcs11-libarary */
	if ((handle = dlopen(provider_id, RTLD_NOW)) == NULL) {
		error("dlopen %s failed: %s", provider_id, dlerror());
		goto fail;
	}
	if ((getfunctionlist = dlsym(handle, "C_GetFunctionList")) == NULL) {
		error("dlsym(C_GetFunctionList) failed: %s", dlerror());
		goto fail;
	}
	p = xcalloc(1, sizeof(*p));
	p->name = xstrdup(provider_id);
	p->handle = handle;
	/* setup the pkcs11 callbacks */
	if ((rv = (*getfunctionlist)(&f)) != CKR_OK) {
		error("C_GetFunctionList for provider %s failed: %lu",
		    provider_id, rv);
		goto fail;
	}
	p->function_list = f;
	if ((rv = f->C_Initialize(NULL)) != CKR_OK) {
		error("C_Initialize for provider %s failed: %lu",
		    provider_id, rv);
		goto fail;
	}
	need_finalize = 1;
	if ((rv = f->C_GetInfo(&p->info)) != CKR_OK) {
		error("C_GetInfo for provider %s failed: %lu",
		    provider_id, rv);
		goto fail;
	}
	rmspace(p->info.manufacturerID, sizeof(p->info.manufacturerID));
	rmspace(p->info.libraryDescription, sizeof(p->info.libraryDescription));
	debug("provider %s: manufacturerID <%s> cryptokiVersion %d.%d"
	    " libraryDescription <%s> libraryVersion %d.%d",
	    provider_id,
	    p->info.manufacturerID,
	    p->info.cryptokiVersion.major,
	    p->info.cryptokiVersion.minor,
	    p->info.libraryDescription,
	    p->info.libraryVersion.major,
	    p->info.libraryVersion.minor);
	if ((rv = f->C_GetSlotList(CK_TRUE, NULL, &p->nslots)) != CKR_OK) {
		error("C_GetSlotList failed: %lu", rv);
		goto fail;
	}
	if (p->nslots == 0) {
		debug("%s: provider %s returned no slots", __func__,
		    provider_id);
		goto fail;
	}
	p->slotlist = xcalloc(p->nslots, sizeof(CK_SLOT_ID));
	if ((rv = f->C_GetSlotList(CK_TRUE, p->slotlist, &p->nslots))
	    != CKR_OK) {
		error("C_GetSlotList for provider %s failed: %lu",
		    provider_id, rv);
		goto fail;
	}
	p->slotinfo = xcalloc(p->nslots, sizeof(struct pkcs11_slotinfo));
	p->valid = 1;
	nkeys = 0;
	for (i = 0; i < p->nslots; i++) {
		token = &p->slotinfo[i].token;
		if ((rv = f->C_GetTokenInfo(p->slotlist[i], token))
		    != CKR_OK) {
			error("C_GetTokenInfo for provider %s slot %lu "
			    "failed: %lu", provider_id, (unsigned long)i, rv);
			continue;
		}
		if ((token->flags & CKF_TOKEN_INITIALIZED) == 0) {
			debug2("%s: ignoring uninitialised token in "
			    "provider %s slot %lu", __func__,
			    provider_id, (unsigned long)i);
			continue;
		}
		rmspace(token->label, sizeof(token->label));
		rmspace(token->manufacturerID, sizeof(token->manufacturerID));
		rmspace(token->model, sizeof(token->model));
		rmspace(token->serialNumber, sizeof(token->serialNumber));
		debug("provider %s slot %lu: label <%s> manufacturerID <%s> "
		    "model <%s> serial <%s> flags 0x%lx",
		    provider_id, (unsigned long)i,
		    token->label, token->manufacturerID, token->model,
		    token->serialNumber, token->flags);
		/* open session, login with pin and retrieve public keys */
		if (pkcs11_open_session(p, i, pin) == 0)
			pkcs11_fetch_keys(p, i, keyp, &nkeys);
	}
	if (nkeys > 0) {
		TAILQ_INSERT_TAIL(&pkcs11_providers, p, next);
		p->refcount++;	/* add to provider list */
		return (nkeys);
	}
	debug("%s: provider %s returned no keys", __func__, provider_id);
	/* don't add the provider, since it does not have any keys */
fail:
	if (need_finalize && (rv = f->C_Finalize(NULL)) != CKR_OK)
		error("C_Finalize for provider %s failed: %lu",
		    provider_id, rv);
	if (p) {
		free(p->slotlist);
		free(p->slotinfo);
		free(p);
	}
	if (handle)
		dlclose(handle);
	return (-1);
}

#else

int
pkcs11_init(int interactive)
{
	return (0);
}

void
pkcs11_terminate(void)
{
	return;
}

#endif /* ENABLE_PKCS11 */