xref: /freebsd/crypto/openssh/ssh-pkcs11.c (revision e6bfd18d21b225af6a0ed67ceeaf1293b7b9eba5)
1 /* $OpenBSD: ssh-pkcs11.c,v 1.56 2023/03/08 05:33:53 tb Exp $ */
2 /*
3  * Copyright (c) 2010 Markus Friedl.  All rights reserved.
4  * Copyright (c) 2014 Pedro Martelletto. All rights reserved.
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #include "includes.h"
20 
21 #ifdef ENABLE_PKCS11
22 
23 #ifdef HAVE_SYS_TIME_H
24 # include <sys/time.h>
25 #endif
26 
27 #include <sys/types.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 
31 #include <ctype.h>
32 #include <string.h>
33 #include <dlfcn.h>
34 
35 #include "openbsd-compat/sys-queue.h"
36 #include "openbsd-compat/openssl-compat.h"
37 
38 #include <openssl/ecdsa.h>
39 #include <openssl/x509.h>
40 #include <openssl/err.h>
41 
42 #define CRYPTOKI_COMPAT
43 #include "pkcs11.h"
44 
45 #include "log.h"
46 #include "misc.h"
47 #include "sshkey.h"
48 #include "ssh-pkcs11.h"
49 #include "digest.h"
50 #include "xmalloc.h"
51 
52 struct pkcs11_slotinfo {
53 	CK_TOKEN_INFO		token;
54 	CK_SESSION_HANDLE	session;
55 	int			logged_in;
56 };
57 
58 struct pkcs11_provider {
59 	char			*name;
60 	void			*handle;
61 	CK_FUNCTION_LIST	*function_list;
62 	CK_INFO			info;
63 	CK_ULONG		nslots;
64 	CK_SLOT_ID		*slotlist;
65 	struct pkcs11_slotinfo	*slotinfo;
66 	int			valid;
67 	int			refcount;
68 	TAILQ_ENTRY(pkcs11_provider) next;
69 };
70 
71 TAILQ_HEAD(, pkcs11_provider) pkcs11_providers;
72 
73 struct pkcs11_key {
74 	struct pkcs11_provider	*provider;
75 	CK_ULONG		slotidx;
76 	char			*keyid;
77 	int			keyid_len;
78 };
79 
80 int pkcs11_interactive = 0;
81 
82 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
83 static void
84 ossl_error(const char *msg)
85 {
86 	unsigned long    e;
87 
88 	error_f("%s", msg);
89 	while ((e = ERR_get_error()) != 0)
90 		error_f("libcrypto error: %s", ERR_error_string(e, NULL));
91 }
92 #endif /* OPENSSL_HAS_ECC && HAVE_EC_KEY_METHOD_NEW */
93 
94 int
95 pkcs11_init(int interactive)
96 {
97 	pkcs11_interactive = interactive;
98 	TAILQ_INIT(&pkcs11_providers);
99 	return (0);
100 }
101 
102 /*
103  * finalize a provider shared library, it's no longer usable.
104  * however, there might still be keys referencing this provider,
105  * so the actual freeing of memory is handled by pkcs11_provider_unref().
106  * this is called when a provider gets unregistered.
107  */
108 static void
109 pkcs11_provider_finalize(struct pkcs11_provider *p)
110 {
111 	CK_RV rv;
112 	CK_ULONG i;
113 
114 	debug_f("provider \"%s\" refcount %d valid %d",
115 	    p->name, p->refcount, p->valid);
116 	if (!p->valid)
117 		return;
118 	for (i = 0; i < p->nslots; i++) {
119 		if (p->slotinfo[i].session &&
120 		    (rv = p->function_list->C_CloseSession(
121 		    p->slotinfo[i].session)) != CKR_OK)
122 			error("C_CloseSession failed: %lu", rv);
123 	}
124 	if ((rv = p->function_list->C_Finalize(NULL)) != CKR_OK)
125 		error("C_Finalize failed: %lu", rv);
126 	p->valid = 0;
127 	p->function_list = NULL;
128 	dlclose(p->handle);
129 }
130 
131 /*
132  * remove a reference to the provider.
133  * called when a key gets destroyed or when the provider is unregistered.
134  */
135 static void
136 pkcs11_provider_unref(struct pkcs11_provider *p)
137 {
138 	debug_f("provider \"%s\" refcount %d", p->name, p->refcount);
139 	if (--p->refcount <= 0) {
140 		if (p->valid)
141 			error_f("provider \"%s\" still valid", p->name);
142 		free(p->name);
143 		free(p->slotlist);
144 		free(p->slotinfo);
145 		free(p);
146 	}
147 }
148 
149 /* unregister all providers, keys might still point to the providers */
150 void
151 pkcs11_terminate(void)
152 {
153 	struct pkcs11_provider *p;
154 
155 	while ((p = TAILQ_FIRST(&pkcs11_providers)) != NULL) {
156 		TAILQ_REMOVE(&pkcs11_providers, p, next);
157 		pkcs11_provider_finalize(p);
158 		pkcs11_provider_unref(p);
159 	}
160 }
161 
162 /* lookup provider by name */
163 static struct pkcs11_provider *
164 pkcs11_provider_lookup(char *provider_id)
165 {
166 	struct pkcs11_provider *p;
167 
168 	TAILQ_FOREACH(p, &pkcs11_providers, next) {
169 		debug("check provider \"%s\"", p->name);
170 		if (!strcmp(provider_id, p->name))
171 			return (p);
172 	}
173 	return (NULL);
174 }
175 
176 /* unregister provider by name */
177 int
178 pkcs11_del_provider(char *provider_id)
179 {
180 	struct pkcs11_provider *p;
181 
182 	if ((p = pkcs11_provider_lookup(provider_id)) != NULL) {
183 		TAILQ_REMOVE(&pkcs11_providers, p, next);
184 		pkcs11_provider_finalize(p);
185 		pkcs11_provider_unref(p);
186 		return (0);
187 	}
188 	return (-1);
189 }
190 
191 static RSA_METHOD *rsa_method;
192 static int rsa_idx = 0;
193 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
194 static EC_KEY_METHOD *ec_key_method;
195 static int ec_key_idx = 0;
196 #endif /* OPENSSL_HAS_ECC && HAVE_EC_KEY_METHOD_NEW */
197 
198 /* release a wrapped object */
199 static void
200 pkcs11_k11_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad, int idx,
201     long argl, void *argp)
202 {
203 	struct pkcs11_key	*k11 = ptr;
204 
205 	debug_f("parent %p ptr %p idx %d", parent, ptr, idx);
206 	if (k11 == NULL)
207 		return;
208 	if (k11->provider)
209 		pkcs11_provider_unref(k11->provider);
210 	free(k11->keyid);
211 	free(k11);
212 }
213 
214 /* find a single 'obj' for given attributes */
215 static int
216 pkcs11_find(struct pkcs11_provider *p, CK_ULONG slotidx, CK_ATTRIBUTE *attr,
217     CK_ULONG nattr, CK_OBJECT_HANDLE *obj)
218 {
219 	CK_FUNCTION_LIST	*f;
220 	CK_SESSION_HANDLE	session;
221 	CK_ULONG		nfound = 0;
222 	CK_RV			rv;
223 	int			ret = -1;
224 
225 	f = p->function_list;
226 	session = p->slotinfo[slotidx].session;
227 	if ((rv = f->C_FindObjectsInit(session, attr, nattr)) != CKR_OK) {
228 		error("C_FindObjectsInit failed (nattr %lu): %lu", nattr, rv);
229 		return (-1);
230 	}
231 	if ((rv = f->C_FindObjects(session, obj, 1, &nfound)) != CKR_OK ||
232 	    nfound != 1) {
233 		debug("C_FindObjects failed (nfound %lu nattr %lu): %lu",
234 		    nfound, nattr, rv);
235 	} else
236 		ret = 0;
237 	if ((rv = f->C_FindObjectsFinal(session)) != CKR_OK)
238 		error("C_FindObjectsFinal failed: %lu", rv);
239 	return (ret);
240 }
241 
242 static int
243 pkcs11_login_slot(struct pkcs11_provider *provider, struct pkcs11_slotinfo *si,
244     CK_USER_TYPE type)
245 {
246 	char			*pin = NULL, prompt[1024];
247 	CK_RV			 rv;
248 
249 	if (provider == NULL || si == NULL || !provider->valid) {
250 		error("no pkcs11 (valid) provider found");
251 		return (-1);
252 	}
253 
254 	if (!pkcs11_interactive) {
255 		error("need pin entry%s",
256 		    (si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH) ?
257 		    " on reader keypad" : "");
258 		return (-1);
259 	}
260 	if (si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH)
261 		verbose("Deferring PIN entry to reader keypad.");
262 	else {
263 		snprintf(prompt, sizeof(prompt), "Enter PIN for '%s': ",
264 		    si->token.label);
265 		if ((pin = read_passphrase(prompt, RP_ALLOW_EOF)) == NULL) {
266 			debug_f("no pin specified");
267 			return (-1);	/* bail out */
268 		}
269 	}
270 	rv = provider->function_list->C_Login(si->session, type, (u_char *)pin,
271 	    (pin != NULL) ? strlen(pin) : 0);
272 	if (pin != NULL)
273 		freezero(pin, strlen(pin));
274 
275 	switch (rv) {
276 	case CKR_OK:
277 	case CKR_USER_ALREADY_LOGGED_IN:
278 		/* success */
279 		break;
280 	case CKR_PIN_LEN_RANGE:
281 		error("PKCS#11 login failed: PIN length out of range");
282 		return -1;
283 	case CKR_PIN_INCORRECT:
284 		error("PKCS#11 login failed: PIN incorrect");
285 		return -1;
286 	case CKR_PIN_LOCKED:
287 		error("PKCS#11 login failed: PIN locked");
288 		return -1;
289 	default:
290 		error("PKCS#11 login failed: error %lu", rv);
291 		return -1;
292 	}
293 	si->logged_in = 1;
294 	return (0);
295 }
296 
297 static int
298 pkcs11_login(struct pkcs11_key *k11, CK_USER_TYPE type)
299 {
300 	if (k11 == NULL || k11->provider == NULL || !k11->provider->valid) {
301 		error("no pkcs11 (valid) provider found");
302 		return (-1);
303 	}
304 
305 	return pkcs11_login_slot(k11->provider,
306 	    &k11->provider->slotinfo[k11->slotidx], type);
307 }
308 
309 
310 static int
311 pkcs11_check_obj_bool_attrib(struct pkcs11_key *k11, CK_OBJECT_HANDLE obj,
312     CK_ATTRIBUTE_TYPE type, int *val)
313 {
314 	struct pkcs11_slotinfo	*si;
315 	CK_FUNCTION_LIST	*f;
316 	CK_BBOOL		flag = 0;
317 	CK_ATTRIBUTE		attr;
318 	CK_RV			 rv;
319 
320 	*val = 0;
321 
322 	if (!k11->provider || !k11->provider->valid) {
323 		error("no pkcs11 (valid) provider found");
324 		return (-1);
325 	}
326 
327 	f = k11->provider->function_list;
328 	si = &k11->provider->slotinfo[k11->slotidx];
329 
330 	attr.type = type;
331 	attr.pValue = &flag;
332 	attr.ulValueLen = sizeof(flag);
333 
334 	rv = f->C_GetAttributeValue(si->session, obj, &attr, 1);
335 	if (rv != CKR_OK) {
336 		error("C_GetAttributeValue failed: %lu", rv);
337 		return (-1);
338 	}
339 	*val = flag != 0;
340 	debug_f("provider \"%s\" slot %lu object %lu: attrib %lu = %d",
341 	    k11->provider->name, k11->slotidx, obj, type, *val);
342 	return (0);
343 }
344 
345 static int
346 pkcs11_get_key(struct pkcs11_key *k11, CK_MECHANISM_TYPE mech_type)
347 {
348 	struct pkcs11_slotinfo	*si;
349 	CK_FUNCTION_LIST	*f;
350 	CK_OBJECT_HANDLE	 obj;
351 	CK_RV			 rv;
352 	CK_OBJECT_CLASS		 private_key_class;
353 	CK_BBOOL		 true_val;
354 	CK_MECHANISM		 mech;
355 	CK_ATTRIBUTE		 key_filter[3];
356 	int			 always_auth = 0;
357 	int			 did_login = 0;
358 
359 	if (!k11->provider || !k11->provider->valid) {
360 		error("no pkcs11 (valid) provider found");
361 		return (-1);
362 	}
363 
364 	f = k11->provider->function_list;
365 	si = &k11->provider->slotinfo[k11->slotidx];
366 
367 	if ((si->token.flags & CKF_LOGIN_REQUIRED) && !si->logged_in) {
368 		if (pkcs11_login(k11, CKU_USER) < 0) {
369 			error("login failed");
370 			return (-1);
371 		}
372 		did_login = 1;
373 	}
374 
375 	memset(&key_filter, 0, sizeof(key_filter));
376 	private_key_class = CKO_PRIVATE_KEY;
377 	key_filter[0].type = CKA_CLASS;
378 	key_filter[0].pValue = &private_key_class;
379 	key_filter[0].ulValueLen = sizeof(private_key_class);
380 
381 	key_filter[1].type = CKA_ID;
382 	key_filter[1].pValue = k11->keyid;
383 	key_filter[1].ulValueLen = k11->keyid_len;
384 
385 	true_val = CK_TRUE;
386 	key_filter[2].type = CKA_SIGN;
387 	key_filter[2].pValue = &true_val;
388 	key_filter[2].ulValueLen = sizeof(true_val);
389 
390 	/* try to find object w/CKA_SIGN first, retry w/o */
391 	if (pkcs11_find(k11->provider, k11->slotidx, key_filter, 3, &obj) < 0 &&
392 	    pkcs11_find(k11->provider, k11->slotidx, key_filter, 2, &obj) < 0) {
393 		error("cannot find private key");
394 		return (-1);
395 	}
396 
397 	memset(&mech, 0, sizeof(mech));
398 	mech.mechanism = mech_type;
399 	mech.pParameter = NULL_PTR;
400 	mech.ulParameterLen = 0;
401 
402 	if ((rv = f->C_SignInit(si->session, &mech, obj)) != CKR_OK) {
403 		error("C_SignInit failed: %lu", rv);
404 		return (-1);
405 	}
406 
407 	pkcs11_check_obj_bool_attrib(k11, obj, CKA_ALWAYS_AUTHENTICATE,
408 	    &always_auth); /* ignore errors here */
409 	if (always_auth && !did_login) {
410 		debug_f("always-auth key");
411 		if (pkcs11_login(k11, CKU_CONTEXT_SPECIFIC) < 0) {
412 			error("login failed for always-auth key");
413 			return (-1);
414 		}
415 	}
416 
417 	return (0);
418 }
419 
420 /* openssl callback doing the actual signing operation */
421 static int
422 pkcs11_rsa_private_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
423     int padding)
424 {
425 	struct pkcs11_key	*k11;
426 	struct pkcs11_slotinfo	*si;
427 	CK_FUNCTION_LIST	*f;
428 	CK_ULONG		tlen = 0;
429 	CK_RV			rv;
430 	int			rval = -1;
431 
432 	if ((k11 = RSA_get_ex_data(rsa, rsa_idx)) == NULL) {
433 		error("RSA_get_ex_data failed");
434 		return (-1);
435 	}
436 
437 	if (pkcs11_get_key(k11, CKM_RSA_PKCS) == -1) {
438 		error("pkcs11_get_key failed");
439 		return (-1);
440 	}
441 
442 	f = k11->provider->function_list;
443 	si = &k11->provider->slotinfo[k11->slotidx];
444 	tlen = RSA_size(rsa);
445 
446 	/* XXX handle CKR_BUFFER_TOO_SMALL */
447 	rv = f->C_Sign(si->session, (CK_BYTE *)from, flen, to, &tlen);
448 	if (rv == CKR_OK)
449 		rval = tlen;
450 	else
451 		error("C_Sign failed: %lu", rv);
452 
453 	return (rval);
454 }
455 
456 static int
457 pkcs11_rsa_private_decrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
458     int padding)
459 {
460 	return (-1);
461 }
462 
463 static int
464 pkcs11_rsa_start_wrapper(void)
465 {
466 	if (rsa_method != NULL)
467 		return (0);
468 	rsa_method = RSA_meth_dup(RSA_get_default_method());
469 	if (rsa_method == NULL)
470 		return (-1);
471 	rsa_idx = RSA_get_ex_new_index(0, "ssh-pkcs11-rsa",
472 	    NULL, NULL, pkcs11_k11_free);
473 	if (rsa_idx == -1)
474 		return (-1);
475 	if (!RSA_meth_set1_name(rsa_method, "pkcs11") ||
476 	    !RSA_meth_set_priv_enc(rsa_method, pkcs11_rsa_private_encrypt) ||
477 	    !RSA_meth_set_priv_dec(rsa_method, pkcs11_rsa_private_decrypt)) {
478 		error_f("setup pkcs11 method failed");
479 		return (-1);
480 	}
481 	return (0);
482 }
483 
484 /* redirect private key operations for rsa key to pkcs11 token */
485 static int
486 pkcs11_rsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
487     CK_ATTRIBUTE *keyid_attrib, RSA *rsa)
488 {
489 	struct pkcs11_key	*k11;
490 
491 	if (pkcs11_rsa_start_wrapper() == -1)
492 		return (-1);
493 
494 	k11 = xcalloc(1, sizeof(*k11));
495 	k11->provider = provider;
496 	provider->refcount++;	/* provider referenced by RSA key */
497 	k11->slotidx = slotidx;
498 	/* identify key object on smartcard */
499 	k11->keyid_len = keyid_attrib->ulValueLen;
500 	if (k11->keyid_len > 0) {
501 		k11->keyid = xmalloc(k11->keyid_len);
502 		memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
503 	}
504 
505 	RSA_set_method(rsa, rsa_method);
506 	RSA_set_ex_data(rsa, rsa_idx, k11);
507 	return (0);
508 }
509 
510 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
511 /* openssl callback doing the actual signing operation */
512 static ECDSA_SIG *
513 ecdsa_do_sign(const unsigned char *dgst, int dgst_len, const BIGNUM *inv,
514     const BIGNUM *rp, EC_KEY *ec)
515 {
516 	struct pkcs11_key	*k11;
517 	struct pkcs11_slotinfo	*si;
518 	CK_FUNCTION_LIST	*f;
519 	CK_ULONG		siglen = 0, bnlen;
520 	CK_RV			rv;
521 	ECDSA_SIG		*ret = NULL;
522 	u_char			*sig;
523 	BIGNUM			*r = NULL, *s = NULL;
524 
525 	if ((k11 = EC_KEY_get_ex_data(ec, ec_key_idx)) == NULL) {
526 		ossl_error("EC_KEY_get_ex_data failed for ec");
527 		return (NULL);
528 	}
529 
530 	if (pkcs11_get_key(k11, CKM_ECDSA) == -1) {
531 		error("pkcs11_get_key failed");
532 		return (NULL);
533 	}
534 
535 	f = k11->provider->function_list;
536 	si = &k11->provider->slotinfo[k11->slotidx];
537 
538 	siglen = ECDSA_size(ec);
539 	sig = xmalloc(siglen);
540 
541 	/* XXX handle CKR_BUFFER_TOO_SMALL */
542 	rv = f->C_Sign(si->session, (CK_BYTE *)dgst, dgst_len, sig, &siglen);
543 	if (rv != CKR_OK) {
544 		error("C_Sign failed: %lu", rv);
545 		goto done;
546 	}
547 	if (siglen < 64 || siglen > 132 || siglen % 2) {
548 		error_f("bad signature length: %lu", (u_long)siglen);
549 		goto done;
550 	}
551 	bnlen = siglen/2;
552 	if ((ret = ECDSA_SIG_new()) == NULL) {
553 		error("ECDSA_SIG_new failed");
554 		goto done;
555 	}
556 	if ((r = BN_bin2bn(sig, bnlen, NULL)) == NULL ||
557 	    (s = BN_bin2bn(sig+bnlen, bnlen, NULL)) == NULL) {
558 		ossl_error("BN_bin2bn failed");
559 		ECDSA_SIG_free(ret);
560 		ret = NULL;
561 		goto done;
562 	}
563 	if (!ECDSA_SIG_set0(ret, r, s)) {
564 		error_f("ECDSA_SIG_set0 failed");
565 		ECDSA_SIG_free(ret);
566 		ret = NULL;
567 		goto done;
568 	}
569 	r = s = NULL; /* now owned by ret */
570 	/* success */
571  done:
572 	BN_free(r);
573 	BN_free(s);
574 	free(sig);
575 
576 	return (ret);
577 }
578 
579 static int
580 pkcs11_ecdsa_start_wrapper(void)
581 {
582 	int (*orig_sign)(int, const unsigned char *, int, unsigned char *,
583 	    unsigned int *, const BIGNUM *, const BIGNUM *, EC_KEY *) = NULL;
584 
585 	if (ec_key_method != NULL)
586 		return (0);
587 	ec_key_idx = EC_KEY_get_ex_new_index(0, "ssh-pkcs11-ecdsa",
588 	    NULL, NULL, pkcs11_k11_free);
589 	if (ec_key_idx == -1)
590 		return (-1);
591 	ec_key_method = EC_KEY_METHOD_new(EC_KEY_OpenSSL());
592 	if (ec_key_method == NULL)
593 		return (-1);
594 	EC_KEY_METHOD_get_sign(ec_key_method, &orig_sign, NULL, NULL);
595 	EC_KEY_METHOD_set_sign(ec_key_method, orig_sign, NULL, ecdsa_do_sign);
596 	return (0);
597 }
598 
599 static int
600 pkcs11_ecdsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
601     CK_ATTRIBUTE *keyid_attrib, EC_KEY *ec)
602 {
603 	struct pkcs11_key	*k11;
604 
605 	if (pkcs11_ecdsa_start_wrapper() == -1)
606 		return (-1);
607 
608 	k11 = xcalloc(1, sizeof(*k11));
609 	k11->provider = provider;
610 	provider->refcount++;	/* provider referenced by ECDSA key */
611 	k11->slotidx = slotidx;
612 	/* identify key object on smartcard */
613 	k11->keyid_len = keyid_attrib->ulValueLen;
614 	if (k11->keyid_len > 0) {
615 		k11->keyid = xmalloc(k11->keyid_len);
616 		memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
617 	}
618 	EC_KEY_set_method(ec, ec_key_method);
619 	EC_KEY_set_ex_data(ec, ec_key_idx, k11);
620 
621 	return (0);
622 }
623 #endif /* OPENSSL_HAS_ECC && HAVE_EC_KEY_METHOD_NEW */
624 
625 /* remove trailing spaces */
626 static void
627 rmspace(u_char *buf, size_t len)
628 {
629 	size_t i;
630 
631 	if (!len)
632 		return;
633 	for (i = len - 1;  i > 0; i--)
634 		if (i == len - 1 || buf[i] == ' ')
635 			buf[i] = '\0';
636 		else
637 			break;
638 }
639 
640 /*
641  * open a pkcs11 session and login if required.
642  * if pin == NULL we delay login until key use
643  */
644 static int
645 pkcs11_open_session(struct pkcs11_provider *p, CK_ULONG slotidx, char *pin,
646     CK_ULONG user)
647 {
648 	struct pkcs11_slotinfo	*si;
649 	CK_FUNCTION_LIST	*f;
650 	CK_RV			rv;
651 	CK_SESSION_HANDLE	session;
652 	int			login_required, ret;
653 
654 	f = p->function_list;
655 	si = &p->slotinfo[slotidx];
656 
657 	login_required = si->token.flags & CKF_LOGIN_REQUIRED;
658 
659 	/* fail early before opening session */
660 	if (login_required && !pkcs11_interactive &&
661 	    (pin == NULL || strlen(pin) == 0)) {
662 		error("pin required");
663 		return (-SSH_PKCS11_ERR_PIN_REQUIRED);
664 	}
665 	if ((rv = f->C_OpenSession(p->slotlist[slotidx], CKF_RW_SESSION|
666 	    CKF_SERIAL_SESSION, NULL, NULL, &session)) != CKR_OK) {
667 		error("C_OpenSession failed: %lu", rv);
668 		return (-1);
669 	}
670 	if (login_required && pin != NULL && strlen(pin) != 0) {
671 		rv = f->C_Login(session, user, (u_char *)pin, strlen(pin));
672 		if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
673 			error("C_Login failed: %lu", rv);
674 			ret = (rv == CKR_PIN_LOCKED) ?
675 			    -SSH_PKCS11_ERR_PIN_LOCKED :
676 			    -SSH_PKCS11_ERR_LOGIN_FAIL;
677 			if ((rv = f->C_CloseSession(session)) != CKR_OK)
678 				error("C_CloseSession failed: %lu", rv);
679 			return (ret);
680 		}
681 		si->logged_in = 1;
682 	}
683 	si->session = session;
684 	return (0);
685 }
686 
687 static int
688 pkcs11_key_included(struct sshkey ***keysp, int *nkeys, struct sshkey *key)
689 {
690 	int i;
691 
692 	for (i = 0; i < *nkeys; i++)
693 		if (sshkey_equal(key, (*keysp)[i]))
694 			return (1);
695 	return (0);
696 }
697 
698 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
699 static struct sshkey *
700 pkcs11_fetch_ecdsa_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
701     CK_OBJECT_HANDLE *obj)
702 {
703 	CK_ATTRIBUTE		 key_attr[3];
704 	CK_SESSION_HANDLE	 session;
705 	CK_FUNCTION_LIST	*f = NULL;
706 	CK_RV			 rv;
707 	ASN1_OCTET_STRING	*octet = NULL;
708 	EC_KEY			*ec = NULL;
709 	EC_GROUP		*group = NULL;
710 	struct sshkey		*key = NULL;
711 	const unsigned char	*attrp = NULL;
712 	int			 i;
713 	int			 nid;
714 
715 	memset(&key_attr, 0, sizeof(key_attr));
716 	key_attr[0].type = CKA_ID;
717 	key_attr[1].type = CKA_EC_POINT;
718 	key_attr[2].type = CKA_EC_PARAMS;
719 
720 	session = p->slotinfo[slotidx].session;
721 	f = p->function_list;
722 
723 	/* figure out size of the attributes */
724 	rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
725 	if (rv != CKR_OK) {
726 		error("C_GetAttributeValue failed: %lu", rv);
727 		return (NULL);
728 	}
729 
730 	/*
731 	 * Allow CKA_ID (always first attribute) to be empty, but
732 	 * ensure that none of the others are zero length.
733 	 * XXX assumes CKA_ID is always first.
734 	 */
735 	if (key_attr[1].ulValueLen == 0 ||
736 	    key_attr[2].ulValueLen == 0) {
737 		error("invalid attribute length");
738 		return (NULL);
739 	}
740 
741 	/* allocate buffers for attributes */
742 	for (i = 0; i < 3; i++)
743 		if (key_attr[i].ulValueLen > 0)
744 			key_attr[i].pValue = xcalloc(1, key_attr[i].ulValueLen);
745 
746 	/* retrieve ID, public point and curve parameters of EC key */
747 	rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
748 	if (rv != CKR_OK) {
749 		error("C_GetAttributeValue failed: %lu", rv);
750 		goto fail;
751 	}
752 
753 	ec = EC_KEY_new();
754 	if (ec == NULL) {
755 		error("EC_KEY_new failed");
756 		goto fail;
757 	}
758 
759 	attrp = key_attr[2].pValue;
760 	group = d2i_ECPKParameters(NULL, &attrp, key_attr[2].ulValueLen);
761 	if (group == NULL) {
762 		ossl_error("d2i_ECPKParameters failed");
763 		goto fail;
764 	}
765 
766 	if (EC_KEY_set_group(ec, group) == 0) {
767 		ossl_error("EC_KEY_set_group failed");
768 		goto fail;
769 	}
770 
771 	if (key_attr[1].ulValueLen <= 2) {
772 		error("CKA_EC_POINT too small");
773 		goto fail;
774 	}
775 
776 	attrp = key_attr[1].pValue;
777 	octet = d2i_ASN1_OCTET_STRING(NULL, &attrp, key_attr[1].ulValueLen);
778 	if (octet == NULL) {
779 		ossl_error("d2i_ASN1_OCTET_STRING failed");
780 		goto fail;
781 	}
782 	attrp = octet->data;
783 	if (o2i_ECPublicKey(&ec, &attrp, octet->length) == NULL) {
784 		ossl_error("o2i_ECPublicKey failed");
785 		goto fail;
786 	}
787 
788 	nid = sshkey_ecdsa_key_to_nid(ec);
789 	if (nid < 0) {
790 		error("couldn't get curve nid");
791 		goto fail;
792 	}
793 
794 	if (pkcs11_ecdsa_wrap(p, slotidx, &key_attr[0], ec))
795 		goto fail;
796 
797 	key = sshkey_new(KEY_UNSPEC);
798 	if (key == NULL) {
799 		error("sshkey_new failed");
800 		goto fail;
801 	}
802 
803 	key->ecdsa = ec;
804 	key->ecdsa_nid = nid;
805 	key->type = KEY_ECDSA;
806 	key->flags |= SSHKEY_FLAG_EXT;
807 	ec = NULL;	/* now owned by key */
808 
809 fail:
810 	for (i = 0; i < 3; i++)
811 		free(key_attr[i].pValue);
812 	if (ec)
813 		EC_KEY_free(ec);
814 	if (group)
815 		EC_GROUP_free(group);
816 	if (octet)
817 		ASN1_OCTET_STRING_free(octet);
818 
819 	return (key);
820 }
821 #endif /* OPENSSL_HAS_ECC && HAVE_EC_KEY_METHOD_NEW */
822 
823 static struct sshkey *
824 pkcs11_fetch_rsa_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
825     CK_OBJECT_HANDLE *obj)
826 {
827 	CK_ATTRIBUTE		 key_attr[3];
828 	CK_SESSION_HANDLE	 session;
829 	CK_FUNCTION_LIST	*f = NULL;
830 	CK_RV			 rv;
831 	RSA			*rsa = NULL;
832 	BIGNUM			*rsa_n, *rsa_e;
833 	struct sshkey		*key = NULL;
834 	int			 i;
835 
836 	memset(&key_attr, 0, sizeof(key_attr));
837 	key_attr[0].type = CKA_ID;
838 	key_attr[1].type = CKA_MODULUS;
839 	key_attr[2].type = CKA_PUBLIC_EXPONENT;
840 
841 	session = p->slotinfo[slotidx].session;
842 	f = p->function_list;
843 
844 	/* figure out size of the attributes */
845 	rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
846 	if (rv != CKR_OK) {
847 		error("C_GetAttributeValue failed: %lu", rv);
848 		return (NULL);
849 	}
850 
851 	/*
852 	 * Allow CKA_ID (always first attribute) to be empty, but
853 	 * ensure that none of the others are zero length.
854 	 * XXX assumes CKA_ID is always first.
855 	 */
856 	if (key_attr[1].ulValueLen == 0 ||
857 	    key_attr[2].ulValueLen == 0) {
858 		error("invalid attribute length");
859 		return (NULL);
860 	}
861 
862 	/* allocate buffers for attributes */
863 	for (i = 0; i < 3; i++)
864 		if (key_attr[i].ulValueLen > 0)
865 			key_attr[i].pValue = xcalloc(1, key_attr[i].ulValueLen);
866 
867 	/* retrieve ID, modulus and public exponent of RSA key */
868 	rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
869 	if (rv != CKR_OK) {
870 		error("C_GetAttributeValue failed: %lu", rv);
871 		goto fail;
872 	}
873 
874 	rsa = RSA_new();
875 	if (rsa == NULL) {
876 		error("RSA_new failed");
877 		goto fail;
878 	}
879 
880 	rsa_n = BN_bin2bn(key_attr[1].pValue, key_attr[1].ulValueLen, NULL);
881 	rsa_e = BN_bin2bn(key_attr[2].pValue, key_attr[2].ulValueLen, NULL);
882 	if (rsa_n == NULL || rsa_e == NULL) {
883 		error("BN_bin2bn failed");
884 		goto fail;
885 	}
886 	if (!RSA_set0_key(rsa, rsa_n, rsa_e, NULL))
887 		fatal_f("set key");
888 	rsa_n = rsa_e = NULL; /* transferred */
889 
890 	if (pkcs11_rsa_wrap(p, slotidx, &key_attr[0], rsa))
891 		goto fail;
892 
893 	key = sshkey_new(KEY_UNSPEC);
894 	if (key == NULL) {
895 		error("sshkey_new failed");
896 		goto fail;
897 	}
898 
899 	key->rsa = rsa;
900 	key->type = KEY_RSA;
901 	key->flags |= SSHKEY_FLAG_EXT;
902 	rsa = NULL;	/* now owned by key */
903 
904 fail:
905 	for (i = 0; i < 3; i++)
906 		free(key_attr[i].pValue);
907 	RSA_free(rsa);
908 
909 	return (key);
910 }
911 
912 static int
913 pkcs11_fetch_x509_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
914     CK_OBJECT_HANDLE *obj, struct sshkey **keyp, char **labelp)
915 {
916 	CK_ATTRIBUTE		 cert_attr[3];
917 	CK_SESSION_HANDLE	 session;
918 	CK_FUNCTION_LIST	*f = NULL;
919 	CK_RV			 rv;
920 	X509			*x509 = NULL;
921 	X509_NAME		*x509_name = NULL;
922 	EVP_PKEY		*evp;
923 	RSA			*rsa = NULL;
924 #ifdef OPENSSL_HAS_ECC
925 	EC_KEY			*ec = NULL;
926 #endif
927 	struct sshkey		*key = NULL;
928 	int			 i;
929 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
930 	int			 nid;
931 #endif
932 	const u_char		*cp;
933 	char			*subject = NULL;
934 
935 	*keyp = NULL;
936 	*labelp = NULL;
937 
938 	memset(&cert_attr, 0, sizeof(cert_attr));
939 	cert_attr[0].type = CKA_ID;
940 	cert_attr[1].type = CKA_SUBJECT;
941 	cert_attr[2].type = CKA_VALUE;
942 
943 	session = p->slotinfo[slotidx].session;
944 	f = p->function_list;
945 
946 	/* figure out size of the attributes */
947 	rv = f->C_GetAttributeValue(session, *obj, cert_attr, 3);
948 	if (rv != CKR_OK) {
949 		error("C_GetAttributeValue failed: %lu", rv);
950 		return -1;
951 	}
952 
953 	/*
954 	 * Allow CKA_ID (always first attribute) to be empty, but
955 	 * ensure that none of the others are zero length.
956 	 * XXX assumes CKA_ID is always first.
957 	 */
958 	if (cert_attr[1].ulValueLen == 0 ||
959 	    cert_attr[2].ulValueLen == 0) {
960 		error("invalid attribute length");
961 		return -1;
962 	}
963 
964 	/* allocate buffers for attributes */
965 	for (i = 0; i < 3; i++)
966 		if (cert_attr[i].ulValueLen > 0)
967 			cert_attr[i].pValue = xcalloc(1, cert_attr[i].ulValueLen);
968 
969 	/* retrieve ID, subject and value of certificate */
970 	rv = f->C_GetAttributeValue(session, *obj, cert_attr, 3);
971 	if (rv != CKR_OK) {
972 		error("C_GetAttributeValue failed: %lu", rv);
973 		goto out;
974 	}
975 
976 	/* Decode DER-encoded cert subject */
977 	cp = cert_attr[1].pValue;
978 	if ((x509_name = d2i_X509_NAME(NULL, &cp,
979 	    cert_attr[1].ulValueLen)) == NULL ||
980 	    (subject = X509_NAME_oneline(x509_name, NULL, 0)) == NULL)
981 		subject = xstrdup("invalid subject");
982 	X509_NAME_free(x509_name);
983 
984 	cp = cert_attr[2].pValue;
985 	if ((x509 = d2i_X509(NULL, &cp, cert_attr[2].ulValueLen)) == NULL) {
986 		error("d2i_x509 failed");
987 		goto out;
988 	}
989 
990 	if ((evp = X509_get_pubkey(x509)) == NULL) {
991 		error("X509_get_pubkey failed");
992 		goto out;
993 	}
994 
995 	if (EVP_PKEY_base_id(evp) == EVP_PKEY_RSA) {
996 		if (EVP_PKEY_get0_RSA(evp) == NULL) {
997 			error("invalid x509; no rsa key");
998 			goto out;
999 		}
1000 		if ((rsa = RSAPublicKey_dup(EVP_PKEY_get0_RSA(evp))) == NULL) {
1001 			error("RSAPublicKey_dup failed");
1002 			goto out;
1003 		}
1004 
1005 		if (pkcs11_rsa_wrap(p, slotidx, &cert_attr[0], rsa))
1006 			goto out;
1007 
1008 		key = sshkey_new(KEY_UNSPEC);
1009 		if (key == NULL) {
1010 			error("sshkey_new failed");
1011 			goto out;
1012 		}
1013 
1014 		key->rsa = rsa;
1015 		key->type = KEY_RSA;
1016 		key->flags |= SSHKEY_FLAG_EXT;
1017 		rsa = NULL;	/* now owned by key */
1018 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
1019 	} else if (EVP_PKEY_base_id(evp) == EVP_PKEY_EC) {
1020 		if (EVP_PKEY_get0_EC_KEY(evp) == NULL) {
1021 			error("invalid x509; no ec key");
1022 			goto out;
1023 		}
1024 		if ((ec = EC_KEY_dup(EVP_PKEY_get0_EC_KEY(evp))) == NULL) {
1025 			error("EC_KEY_dup failed");
1026 			goto out;
1027 		}
1028 
1029 		nid = sshkey_ecdsa_key_to_nid(ec);
1030 		if (nid < 0) {
1031 			error("couldn't get curve nid");
1032 			goto out;
1033 		}
1034 
1035 		if (pkcs11_ecdsa_wrap(p, slotidx, &cert_attr[0], ec))
1036 			goto out;
1037 
1038 		key = sshkey_new(KEY_UNSPEC);
1039 		if (key == NULL) {
1040 			error("sshkey_new failed");
1041 			goto out;
1042 		}
1043 
1044 		key->ecdsa = ec;
1045 		key->ecdsa_nid = nid;
1046 		key->type = KEY_ECDSA;
1047 		key->flags |= SSHKEY_FLAG_EXT;
1048 		ec = NULL;	/* now owned by key */
1049 #endif /* OPENSSL_HAS_ECC && HAVE_EC_KEY_METHOD_NEW */
1050 	} else {
1051 		error("unknown certificate key type");
1052 		goto out;
1053 	}
1054  out:
1055 	for (i = 0; i < 3; i++)
1056 		free(cert_attr[i].pValue);
1057 	X509_free(x509);
1058 	RSA_free(rsa);
1059 #ifdef OPENSSL_HAS_ECC
1060 	EC_KEY_free(ec);
1061 #endif
1062 	if (key == NULL) {
1063 		free(subject);
1064 		return -1;
1065 	}
1066 	/* success */
1067 	*keyp = key;
1068 	*labelp = subject;
1069 	return 0;
1070 }
1071 
1072 #if 0
1073 static int
1074 have_rsa_key(const RSA *rsa)
1075 {
1076 	const BIGNUM *rsa_n, *rsa_e;
1077 
1078 	RSA_get0_key(rsa, &rsa_n, &rsa_e, NULL);
1079 	return rsa_n != NULL && rsa_e != NULL;
1080 }
1081 #endif
1082 
1083 static void
1084 note_key(struct pkcs11_provider *p, CK_ULONG slotidx, const char *context,
1085     struct sshkey *key)
1086 {
1087 	char *fp;
1088 
1089 	if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
1090 	    SSH_FP_DEFAULT)) == NULL) {
1091 		error_f("sshkey_fingerprint failed");
1092 		return;
1093 	}
1094 	debug2("%s: provider %s slot %lu: %s %s", context, p->name,
1095 	    (u_long)slotidx, sshkey_type(key), fp);
1096 	free(fp);
1097 }
1098 
1099 /*
1100  * lookup certificates for token in slot identified by slotidx,
1101  * add 'wrapped' public keys to the 'keysp' array and increment nkeys.
1102  * keysp points to an (possibly empty) array with *nkeys keys.
1103  */
1104 static int
1105 pkcs11_fetch_certs(struct pkcs11_provider *p, CK_ULONG slotidx,
1106     struct sshkey ***keysp, char ***labelsp, int *nkeys)
1107 {
1108 	struct sshkey		*key = NULL;
1109 	CK_OBJECT_CLASS		 key_class;
1110 	CK_ATTRIBUTE		 key_attr[1];
1111 	CK_SESSION_HANDLE	 session;
1112 	CK_FUNCTION_LIST	*f = NULL;
1113 	CK_RV			 rv;
1114 	CK_OBJECT_HANDLE	 obj;
1115 	CK_ULONG		 n = 0;
1116 	int			 ret = -1;
1117 	char			*label;
1118 
1119 	memset(&key_attr, 0, sizeof(key_attr));
1120 	memset(&obj, 0, sizeof(obj));
1121 
1122 	key_class = CKO_CERTIFICATE;
1123 	key_attr[0].type = CKA_CLASS;
1124 	key_attr[0].pValue = &key_class;
1125 	key_attr[0].ulValueLen = sizeof(key_class);
1126 
1127 	session = p->slotinfo[slotidx].session;
1128 	f = p->function_list;
1129 
1130 	rv = f->C_FindObjectsInit(session, key_attr, 1);
1131 	if (rv != CKR_OK) {
1132 		error("C_FindObjectsInit failed: %lu", rv);
1133 		goto fail;
1134 	}
1135 
1136 	while (1) {
1137 		CK_CERTIFICATE_TYPE	ck_cert_type;
1138 
1139 		rv = f->C_FindObjects(session, &obj, 1, &n);
1140 		if (rv != CKR_OK) {
1141 			error("C_FindObjects failed: %lu", rv);
1142 			goto fail;
1143 		}
1144 		if (n == 0)
1145 			break;
1146 
1147 		memset(&ck_cert_type, 0, sizeof(ck_cert_type));
1148 		memset(&key_attr, 0, sizeof(key_attr));
1149 		key_attr[0].type = CKA_CERTIFICATE_TYPE;
1150 		key_attr[0].pValue = &ck_cert_type;
1151 		key_attr[0].ulValueLen = sizeof(ck_cert_type);
1152 
1153 		rv = f->C_GetAttributeValue(session, obj, key_attr, 1);
1154 		if (rv != CKR_OK) {
1155 			error("C_GetAttributeValue failed: %lu", rv);
1156 			goto fail;
1157 		}
1158 
1159 		key = NULL;
1160 		label = NULL;
1161 		switch (ck_cert_type) {
1162 		case CKC_X_509:
1163 			if (pkcs11_fetch_x509_pubkey(p, slotidx, &obj,
1164 			    &key, &label) != 0) {
1165 				error("failed to fetch key");
1166 				continue;
1167 			}
1168 			break;
1169 		default:
1170 			error("skipping unsupported certificate type %lu",
1171 			    ck_cert_type);
1172 			continue;
1173 		}
1174 		note_key(p, slotidx, __func__, key);
1175 		if (pkcs11_key_included(keysp, nkeys, key)) {
1176 			debug2_f("key already included");;
1177 			sshkey_free(key);
1178 		} else {
1179 			/* expand key array and add key */
1180 			*keysp = xrecallocarray(*keysp, *nkeys,
1181 			    *nkeys + 1, sizeof(struct sshkey *));
1182 			(*keysp)[*nkeys] = key;
1183 			if (labelsp != NULL) {
1184 				*labelsp = xrecallocarray(*labelsp, *nkeys,
1185 				    *nkeys + 1, sizeof(char *));
1186 				(*labelsp)[*nkeys] = xstrdup((char *)label);
1187 			}
1188 			*nkeys = *nkeys + 1;
1189 			debug("have %d keys", *nkeys);
1190 		}
1191 	}
1192 
1193 	ret = 0;
1194 fail:
1195 	rv = f->C_FindObjectsFinal(session);
1196 	if (rv != CKR_OK) {
1197 		error("C_FindObjectsFinal failed: %lu", rv);
1198 		ret = -1;
1199 	}
1200 
1201 	return (ret);
1202 }
1203 
1204 /*
1205  * lookup public keys for token in slot identified by slotidx,
1206  * add 'wrapped' public keys to the 'keysp' array and increment nkeys.
1207  * keysp points to an (possibly empty) array with *nkeys keys.
1208  */
1209 static int
1210 pkcs11_fetch_keys(struct pkcs11_provider *p, CK_ULONG slotidx,
1211     struct sshkey ***keysp, char ***labelsp, int *nkeys)
1212 {
1213 	struct sshkey		*key = NULL;
1214 	CK_OBJECT_CLASS		 key_class;
1215 	CK_ATTRIBUTE		 key_attr[2];
1216 	CK_SESSION_HANDLE	 session;
1217 	CK_FUNCTION_LIST	*f = NULL;
1218 	CK_RV			 rv;
1219 	CK_OBJECT_HANDLE	 obj;
1220 	CK_ULONG		 n = 0;
1221 	int			 ret = -1;
1222 
1223 	memset(&key_attr, 0, sizeof(key_attr));
1224 	memset(&obj, 0, sizeof(obj));
1225 
1226 	key_class = CKO_PUBLIC_KEY;
1227 	key_attr[0].type = CKA_CLASS;
1228 	key_attr[0].pValue = &key_class;
1229 	key_attr[0].ulValueLen = sizeof(key_class);
1230 
1231 	session = p->slotinfo[slotidx].session;
1232 	f = p->function_list;
1233 
1234 	rv = f->C_FindObjectsInit(session, key_attr, 1);
1235 	if (rv != CKR_OK) {
1236 		error("C_FindObjectsInit failed: %lu", rv);
1237 		goto fail;
1238 	}
1239 
1240 	while (1) {
1241 		CK_KEY_TYPE	ck_key_type;
1242 		CK_UTF8CHAR	label[256];
1243 
1244 		rv = f->C_FindObjects(session, &obj, 1, &n);
1245 		if (rv != CKR_OK) {
1246 			error("C_FindObjects failed: %lu", rv);
1247 			goto fail;
1248 		}
1249 		if (n == 0)
1250 			break;
1251 
1252 		memset(&ck_key_type, 0, sizeof(ck_key_type));
1253 		memset(&key_attr, 0, sizeof(key_attr));
1254 		key_attr[0].type = CKA_KEY_TYPE;
1255 		key_attr[0].pValue = &ck_key_type;
1256 		key_attr[0].ulValueLen = sizeof(ck_key_type);
1257 		key_attr[1].type = CKA_LABEL;
1258 		key_attr[1].pValue = &label;
1259 		key_attr[1].ulValueLen = sizeof(label) - 1;
1260 
1261 		rv = f->C_GetAttributeValue(session, obj, key_attr, 2);
1262 		if (rv != CKR_OK) {
1263 			error("C_GetAttributeValue failed: %lu", rv);
1264 			goto fail;
1265 		}
1266 
1267 		label[key_attr[1].ulValueLen] = '\0';
1268 
1269 		switch (ck_key_type) {
1270 		case CKK_RSA:
1271 			key = pkcs11_fetch_rsa_pubkey(p, slotidx, &obj);
1272 			break;
1273 #if defined(OPENSSL_HAS_ECC) && defined(HAVE_EC_KEY_METHOD_NEW)
1274 		case CKK_ECDSA:
1275 			key = pkcs11_fetch_ecdsa_pubkey(p, slotidx, &obj);
1276 			break;
1277 #endif /* OPENSSL_HAS_ECC && HAVE_EC_KEY_METHOD_NEW */
1278 		default:
1279 			/* XXX print key type? */
1280 			key = NULL;
1281 			error("skipping unsupported key type");
1282 		}
1283 
1284 		if (key == NULL) {
1285 			error("failed to fetch key");
1286 			continue;
1287 		}
1288 		note_key(p, slotidx, __func__, key);
1289 		if (pkcs11_key_included(keysp, nkeys, key)) {
1290 			debug2_f("key already included");;
1291 			sshkey_free(key);
1292 		} else {
1293 			/* expand key array and add key */
1294 			*keysp = xrecallocarray(*keysp, *nkeys,
1295 			    *nkeys + 1, sizeof(struct sshkey *));
1296 			(*keysp)[*nkeys] = key;
1297 			if (labelsp != NULL) {
1298 				*labelsp = xrecallocarray(*labelsp, *nkeys,
1299 				    *nkeys + 1, sizeof(char *));
1300 				(*labelsp)[*nkeys] = xstrdup((char *)label);
1301 			}
1302 			*nkeys = *nkeys + 1;
1303 			debug("have %d keys", *nkeys);
1304 		}
1305 	}
1306 
1307 	ret = 0;
1308 fail:
1309 	rv = f->C_FindObjectsFinal(session);
1310 	if (rv != CKR_OK) {
1311 		error("C_FindObjectsFinal failed: %lu", rv);
1312 		ret = -1;
1313 	}
1314 
1315 	return (ret);
1316 }
1317 
1318 #ifdef WITH_PKCS11_KEYGEN
1319 #define FILL_ATTR(attr, idx, typ, val, len) \
1320 	{ (attr[idx]).type=(typ); (attr[idx]).pValue=(val); (attr[idx]).ulValueLen=len; idx++; }
1321 
1322 static struct sshkey *
1323 pkcs11_rsa_generate_private_key(struct pkcs11_provider *p, CK_ULONG slotidx,
1324     char *label, CK_ULONG bits, CK_BYTE keyid, u_int32_t *err)
1325 {
1326 	struct pkcs11_slotinfo	*si;
1327 	char			*plabel = label ? label : "";
1328 	int			 npub = 0, npriv = 0;
1329 	CK_RV			 rv;
1330 	CK_FUNCTION_LIST	*f;
1331 	CK_SESSION_HANDLE	 session;
1332 	CK_BBOOL		 true_val = CK_TRUE, false_val = CK_FALSE;
1333 	CK_OBJECT_HANDLE	 pubKey, privKey;
1334 	CK_ATTRIBUTE		 tpub[16], tpriv[16];
1335 	CK_MECHANISM		 mech = {
1336 	    CKM_RSA_PKCS_KEY_PAIR_GEN, NULL_PTR, 0
1337 	};
1338 	CK_BYTE			 pubExponent[] = {
1339 	    0x01, 0x00, 0x01 /* RSA_F4 in bytes */
1340 	};
1341 	pubkey_filter[0].pValue = &pubkey_class;
1342 	cert_filter[0].pValue = &cert_class;
1343 
1344 	*err = 0;
1345 
1346 	FILL_ATTR(tpub, npub, CKA_TOKEN, &true_val, sizeof(true_val));
1347 	FILL_ATTR(tpub, npub, CKA_LABEL, plabel, strlen(plabel));
1348 	FILL_ATTR(tpub, npub, CKA_ENCRYPT, &false_val, sizeof(false_val));
1349 	FILL_ATTR(tpub, npub, CKA_VERIFY, &true_val, sizeof(true_val));
1350 	FILL_ATTR(tpub, npub, CKA_VERIFY_RECOVER, &false_val,
1351 	    sizeof(false_val));
1352 	FILL_ATTR(tpub, npub, CKA_WRAP, &false_val, sizeof(false_val));
1353 	FILL_ATTR(tpub, npub, CKA_DERIVE, &false_val, sizeof(false_val));
1354 	FILL_ATTR(tpub, npub, CKA_MODULUS_BITS, &bits, sizeof(bits));
1355 	FILL_ATTR(tpub, npub, CKA_PUBLIC_EXPONENT, pubExponent,
1356 	    sizeof(pubExponent));
1357 	FILL_ATTR(tpub, npub, CKA_ID, &keyid, sizeof(keyid));
1358 
1359 	FILL_ATTR(tpriv, npriv, CKA_TOKEN,  &true_val, sizeof(true_val));
1360 	FILL_ATTR(tpriv, npriv, CKA_LABEL,  plabel, strlen(plabel));
1361 	FILL_ATTR(tpriv, npriv, CKA_PRIVATE,  &true_val, sizeof(true_val));
1362 	FILL_ATTR(tpriv, npriv, CKA_SENSITIVE,  &true_val, sizeof(true_val));
1363 	FILL_ATTR(tpriv, npriv, CKA_DECRYPT,  &false_val, sizeof(false_val));
1364 	FILL_ATTR(tpriv, npriv, CKA_SIGN,  &true_val, sizeof(true_val));
1365 	FILL_ATTR(tpriv, npriv, CKA_SIGN_RECOVER,  &false_val,
1366 	    sizeof(false_val));
1367 	FILL_ATTR(tpriv, npriv, CKA_UNWRAP,  &false_val, sizeof(false_val));
1368 	FILL_ATTR(tpriv, npriv, CKA_DERIVE,  &false_val, sizeof(false_val));
1369 	FILL_ATTR(tpriv, npriv, CKA_ID, &keyid, sizeof(keyid));
1370 
1371 	f = p->function_list;
1372 	si = &p->slotinfo[slotidx];
1373 	session = si->session;
1374 
1375 	if ((rv = f->C_GenerateKeyPair(session, &mech, tpub, npub, tpriv, npriv,
1376 	    &pubKey, &privKey)) != CKR_OK) {
1377 		error_f("key generation failed: error 0x%lx", rv);
1378 		*err = rv;
1379 		return NULL;
1380 	}
1381 
1382 	return pkcs11_fetch_rsa_pubkey(p, slotidx, &pubKey);
1383 }
1384 
1385 static int
1386 pkcs11_decode_hex(const char *hex, unsigned char **dest, size_t *rlen)
1387 {
1388 	size_t	i, len;
1389 	char	ptr[3];
1390 
1391 	if (dest)
1392 		*dest = NULL;
1393 	if (rlen)
1394 		*rlen = 0;
1395 
1396 	if ((len = strlen(hex)) % 2)
1397 		return -1;
1398 	len /= 2;
1399 
1400 	*dest = xmalloc(len);
1401 
1402 	ptr[2] = '\0';
1403 	for (i = 0; i < len; i++) {
1404 		ptr[0] = hex[2 * i];
1405 		ptr[1] = hex[(2 * i) + 1];
1406 		if (!isxdigit(ptr[0]) || !isxdigit(ptr[1]))
1407 			return -1;
1408 		(*dest)[i] = (unsigned char)strtoul(ptr, NULL, 16);
1409 	}
1410 
1411 	if (rlen)
1412 		*rlen = len;
1413 
1414 	return 0;
1415 }
1416 
1417 static struct ec_curve_info {
1418 	const char	*name;
1419 	const char	*oid;
1420 	const char	*oid_encoded;
1421 	size_t		 size;
1422 } ec_curve_infos[] = {
1423 	{"prime256v1",	"1.2.840.10045.3.1.7",	"06082A8648CE3D030107", 256},
1424 	{"secp384r1",	"1.3.132.0.34",		"06052B81040022",	384},
1425 	{"secp521r1",	"1.3.132.0.35",		"06052B81040023",	521},
1426 	{NULL,		NULL,			NULL,			0},
1427 };
1428 
1429 static struct sshkey *
1430 pkcs11_ecdsa_generate_private_key(struct pkcs11_provider *p, CK_ULONG slotidx,
1431     char *label, CK_ULONG bits, CK_BYTE keyid, u_int32_t *err)
1432 {
1433 	struct pkcs11_slotinfo	*si;
1434 	char			*plabel = label ? label : "";
1435 	int			 i;
1436 	size_t			 ecparams_size;
1437 	unsigned char		*ecparams = NULL;
1438 	int			 npub = 0, npriv = 0;
1439 	CK_RV			 rv;
1440 	CK_FUNCTION_LIST	*f;
1441 	CK_SESSION_HANDLE	 session;
1442 	CK_BBOOL		 true_val = CK_TRUE, false_val = CK_FALSE;
1443 	CK_OBJECT_HANDLE	 pubKey, privKey;
1444 	CK_MECHANISM		 mech = {
1445 	    CKM_EC_KEY_PAIR_GEN, NULL_PTR, 0
1446 	};
1447 	CK_ATTRIBUTE		 tpub[16], tpriv[16];
1448 
1449 	*err = 0;
1450 
1451 	for (i = 0; ec_curve_infos[i].name; i++) {
1452 		if (ec_curve_infos[i].size == bits)
1453 			break;
1454 	}
1455 	if (!ec_curve_infos[i].name) {
1456 		error_f("invalid key size %lu", bits);
1457 		return NULL;
1458 	}
1459 	if (pkcs11_decode_hex(ec_curve_infos[i].oid_encoded, &ecparams,
1460 	    &ecparams_size) == -1) {
1461 		error_f("invalid oid");
1462 		return NULL;
1463 	}
1464 
1465 	FILL_ATTR(tpub, npub, CKA_TOKEN, &true_val, sizeof(true_val));
1466 	FILL_ATTR(tpub, npub, CKA_LABEL, plabel, strlen(plabel));
1467 	FILL_ATTR(tpub, npub, CKA_ENCRYPT, &false_val, sizeof(false_val));
1468 	FILL_ATTR(tpub, npub, CKA_VERIFY, &true_val, sizeof(true_val));
1469 	FILL_ATTR(tpub, npub, CKA_VERIFY_RECOVER, &false_val,
1470 	    sizeof(false_val));
1471 	FILL_ATTR(tpub, npub, CKA_WRAP, &false_val, sizeof(false_val));
1472 	FILL_ATTR(tpub, npub, CKA_DERIVE, &false_val, sizeof(false_val));
1473 	FILL_ATTR(tpub, npub, CKA_EC_PARAMS, ecparams, ecparams_size);
1474 	FILL_ATTR(tpub, npub, CKA_ID, &keyid, sizeof(keyid));
1475 
1476 	FILL_ATTR(tpriv, npriv, CKA_TOKEN, &true_val, sizeof(true_val));
1477 	FILL_ATTR(tpriv, npriv, CKA_LABEL, plabel, strlen(plabel));
1478 	FILL_ATTR(tpriv, npriv, CKA_PRIVATE, &true_val, sizeof(true_val));
1479 	FILL_ATTR(tpriv, npriv, CKA_SENSITIVE, &true_val, sizeof(true_val));
1480 	FILL_ATTR(tpriv, npriv, CKA_DECRYPT, &false_val, sizeof(false_val));
1481 	FILL_ATTR(tpriv, npriv, CKA_SIGN, &true_val, sizeof(true_val));
1482 	FILL_ATTR(tpriv, npriv, CKA_SIGN_RECOVER, &false_val,
1483 	    sizeof(false_val));
1484 	FILL_ATTR(tpriv, npriv, CKA_UNWRAP, &false_val, sizeof(false_val));
1485 	FILL_ATTR(tpriv, npriv, CKA_DERIVE, &false_val, sizeof(false_val));
1486 	FILL_ATTR(tpriv, npriv, CKA_ID, &keyid, sizeof(keyid));
1487 
1488 	f = p->function_list;
1489 	si = &p->slotinfo[slotidx];
1490 	session = si->session;
1491 
1492 	if ((rv = f->C_GenerateKeyPair(session, &mech, tpub, npub, tpriv, npriv,
1493 	    &pubKey, &privKey)) != CKR_OK) {
1494 		error_f("key generation failed: error 0x%lx", rv);
1495 		*err = rv;
1496 		return NULL;
1497 	}
1498 
1499 	return pkcs11_fetch_ecdsa_pubkey(p, slotidx, &pubKey);
1500 }
1501 #endif /* WITH_PKCS11_KEYGEN */
1502 
1503 /*
1504  * register a new provider, fails if provider already exists. if
1505  * keyp is provided, fetch keys.
1506  */
1507 static int
1508 pkcs11_register_provider(char *provider_id, char *pin,
1509     struct sshkey ***keyp, char ***labelsp,
1510     struct pkcs11_provider **providerp, CK_ULONG user)
1511 {
1512 	int nkeys, need_finalize = 0;
1513 	int ret = -1;
1514 	struct pkcs11_provider *p = NULL;
1515 	void *handle = NULL;
1516 	CK_RV (*getfunctionlist)(CK_FUNCTION_LIST **);
1517 	CK_RV rv;
1518 	CK_FUNCTION_LIST *f = NULL;
1519 	CK_TOKEN_INFO *token;
1520 	CK_ULONG i;
1521 
1522 	if (providerp == NULL)
1523 		goto fail;
1524 	*providerp = NULL;
1525 
1526 	if (keyp != NULL)
1527 		*keyp = NULL;
1528 	if (labelsp != NULL)
1529 		*labelsp = NULL;
1530 
1531 	if (pkcs11_provider_lookup(provider_id) != NULL) {
1532 		debug_f("provider already registered: %s", provider_id);
1533 		goto fail;
1534 	}
1535 	/* open shared pkcs11-library */
1536 	if ((handle = dlopen(provider_id, RTLD_NOW)) == NULL) {
1537 		error("dlopen %s failed: %s", provider_id, dlerror());
1538 		goto fail;
1539 	}
1540 	if ((getfunctionlist = dlsym(handle, "C_GetFunctionList")) == NULL) {
1541 		error("dlsym(C_GetFunctionList) failed: %s", dlerror());
1542 		goto fail;
1543 	}
1544 	p = xcalloc(1, sizeof(*p));
1545 	p->name = xstrdup(provider_id);
1546 	p->handle = handle;
1547 	/* setup the pkcs11 callbacks */
1548 	if ((rv = (*getfunctionlist)(&f)) != CKR_OK) {
1549 		error("C_GetFunctionList for provider %s failed: %lu",
1550 		    provider_id, rv);
1551 		goto fail;
1552 	}
1553 	p->function_list = f;
1554 	if ((rv = f->C_Initialize(NULL)) != CKR_OK) {
1555 		error("C_Initialize for provider %s failed: %lu",
1556 		    provider_id, rv);
1557 		goto fail;
1558 	}
1559 	need_finalize = 1;
1560 	if ((rv = f->C_GetInfo(&p->info)) != CKR_OK) {
1561 		error("C_GetInfo for provider %s failed: %lu",
1562 		    provider_id, rv);
1563 		goto fail;
1564 	}
1565 	rmspace(p->info.manufacturerID, sizeof(p->info.manufacturerID));
1566 	rmspace(p->info.libraryDescription, sizeof(p->info.libraryDescription));
1567 	debug("provider %s: manufacturerID <%s> cryptokiVersion %d.%d"
1568 	    " libraryDescription <%s> libraryVersion %d.%d",
1569 	    provider_id,
1570 	    p->info.manufacturerID,
1571 	    p->info.cryptokiVersion.major,
1572 	    p->info.cryptokiVersion.minor,
1573 	    p->info.libraryDescription,
1574 	    p->info.libraryVersion.major,
1575 	    p->info.libraryVersion.minor);
1576 	if ((rv = f->C_GetSlotList(CK_TRUE, NULL, &p->nslots)) != CKR_OK) {
1577 		error("C_GetSlotList failed: %lu", rv);
1578 		goto fail;
1579 	}
1580 	if (p->nslots == 0) {
1581 		debug_f("provider %s returned no slots", provider_id);
1582 		ret = -SSH_PKCS11_ERR_NO_SLOTS;
1583 		goto fail;
1584 	}
1585 	p->slotlist = xcalloc(p->nslots, sizeof(CK_SLOT_ID));
1586 	if ((rv = f->C_GetSlotList(CK_TRUE, p->slotlist, &p->nslots))
1587 	    != CKR_OK) {
1588 		error("C_GetSlotList for provider %s failed: %lu",
1589 		    provider_id, rv);
1590 		goto fail;
1591 	}
1592 	p->slotinfo = xcalloc(p->nslots, sizeof(struct pkcs11_slotinfo));
1593 	p->valid = 1;
1594 	nkeys = 0;
1595 	for (i = 0; i < p->nslots; i++) {
1596 		token = &p->slotinfo[i].token;
1597 		if ((rv = f->C_GetTokenInfo(p->slotlist[i], token))
1598 		    != CKR_OK) {
1599 			error("C_GetTokenInfo for provider %s slot %lu "
1600 			    "failed: %lu", provider_id, (u_long)i, rv);
1601 			continue;
1602 		}
1603 		if ((token->flags & CKF_TOKEN_INITIALIZED) == 0) {
1604 			debug2_f("ignoring uninitialised token in "
1605 			    "provider %s slot %lu", provider_id, (u_long)i);
1606 			continue;
1607 		}
1608 		rmspace(token->label, sizeof(token->label));
1609 		rmspace(token->manufacturerID, sizeof(token->manufacturerID));
1610 		rmspace(token->model, sizeof(token->model));
1611 		rmspace(token->serialNumber, sizeof(token->serialNumber));
1612 		debug("provider %s slot %lu: label <%s> manufacturerID <%s> "
1613 		    "model <%s> serial <%s> flags 0x%lx",
1614 		    provider_id, (unsigned long)i,
1615 		    token->label, token->manufacturerID, token->model,
1616 		    token->serialNumber, token->flags);
1617 		/*
1618 		 * open session, login with pin and retrieve public
1619 		 * keys (if keyp is provided)
1620 		 */
1621 		if ((ret = pkcs11_open_session(p, i, pin, user)) != 0 ||
1622 		    keyp == NULL)
1623 			continue;
1624 		pkcs11_fetch_keys(p, i, keyp, labelsp, &nkeys);
1625 		pkcs11_fetch_certs(p, i, keyp, labelsp, &nkeys);
1626 		if (nkeys == 0 && !p->slotinfo[i].logged_in &&
1627 		    pkcs11_interactive) {
1628 			/*
1629 			 * Some tokens require login before they will
1630 			 * expose keys.
1631 			 */
1632 			if (pkcs11_login_slot(p, &p->slotinfo[i],
1633 			    CKU_USER) < 0) {
1634 				error("login failed");
1635 				continue;
1636 			}
1637 			pkcs11_fetch_keys(p, i, keyp, labelsp, &nkeys);
1638 			pkcs11_fetch_certs(p, i, keyp, labelsp, &nkeys);
1639 		}
1640 	}
1641 
1642 	/* now owned by caller */
1643 	*providerp = p;
1644 
1645 	TAILQ_INSERT_TAIL(&pkcs11_providers, p, next);
1646 	p->refcount++;	/* add to provider list */
1647 
1648 	return (nkeys);
1649 fail:
1650 	if (need_finalize && (rv = f->C_Finalize(NULL)) != CKR_OK)
1651 		error("C_Finalize for provider %s failed: %lu",
1652 		    provider_id, rv);
1653 	if (p) {
1654 		free(p->name);
1655 		free(p->slotlist);
1656 		free(p->slotinfo);
1657 		free(p);
1658 	}
1659 	if (handle)
1660 		dlclose(handle);
1661 	if (ret > 0)
1662 		ret = -1;
1663 	return (ret);
1664 }
1665 
1666 /*
1667  * register a new provider and get number of keys hold by the token,
1668  * fails if provider already exists
1669  */
1670 int
1671 pkcs11_add_provider(char *provider_id, char *pin, struct sshkey ***keyp,
1672     char ***labelsp)
1673 {
1674 	struct pkcs11_provider *p = NULL;
1675 	int nkeys;
1676 
1677 	nkeys = pkcs11_register_provider(provider_id, pin, keyp, labelsp,
1678 	    &p, CKU_USER);
1679 
1680 	/* no keys found or some other error, de-register provider */
1681 	if (nkeys <= 0 && p != NULL) {
1682 		TAILQ_REMOVE(&pkcs11_providers, p, next);
1683 		pkcs11_provider_finalize(p);
1684 		pkcs11_provider_unref(p);
1685 	}
1686 	if (nkeys == 0)
1687 		debug_f("provider %s returned no keys", provider_id);
1688 
1689 	return (nkeys);
1690 }
1691 
1692 #ifdef WITH_PKCS11_KEYGEN
1693 struct sshkey *
1694 pkcs11_gakp(char *provider_id, char *pin, unsigned int slotidx, char *label,
1695     unsigned int type, unsigned int bits, unsigned char keyid, u_int32_t *err)
1696 {
1697 	struct pkcs11_provider	*p = NULL;
1698 	struct pkcs11_slotinfo	*si;
1699 	CK_FUNCTION_LIST	*f;
1700 	CK_SESSION_HANDLE	 session;
1701 	struct sshkey		*k = NULL;
1702 	int			 ret = -1, reset_pin = 0, reset_provider = 0;
1703 	CK_RV			 rv;
1704 
1705 	*err = 0;
1706 
1707 	if ((p = pkcs11_provider_lookup(provider_id)) != NULL)
1708 		debug_f("provider \"%s\" available", provider_id);
1709 	else if ((ret = pkcs11_register_provider(provider_id, pin, NULL, NULL,
1710 	    &p, CKU_SO)) < 0) {
1711 		debug_f("could not register provider %s", provider_id);
1712 		goto out;
1713 	} else
1714 		reset_provider = 1;
1715 
1716 	f = p->function_list;
1717 	si = &p->slotinfo[slotidx];
1718 	session = si->session;
1719 
1720 	if ((rv = f->C_SetOperationState(session , pin, strlen(pin),
1721 	    CK_INVALID_HANDLE, CK_INVALID_HANDLE)) != CKR_OK) {
1722 		debug_f("could not supply SO pin: %lu", rv);
1723 		reset_pin = 0;
1724 	} else
1725 		reset_pin = 1;
1726 
1727 	switch (type) {
1728 	case KEY_RSA:
1729 		if ((k = pkcs11_rsa_generate_private_key(p, slotidx, label,
1730 		    bits, keyid, err)) == NULL) {
1731 			debug_f("failed to generate RSA key");
1732 			goto out;
1733 		}
1734 		break;
1735 	case KEY_ECDSA:
1736 		if ((k = pkcs11_ecdsa_generate_private_key(p, slotidx, label,
1737 		    bits, keyid, err)) == NULL) {
1738 			debug_f("failed to generate ECDSA key");
1739 			goto out;
1740 		}
1741 		break;
1742 	default:
1743 		*err = SSH_PKCS11_ERR_GENERIC;
1744 		debug_f("unknown type %d", type);
1745 		goto out;
1746 	}
1747 
1748 out:
1749 	if (reset_pin)
1750 		f->C_SetOperationState(session , NULL, 0, CK_INVALID_HANDLE,
1751 		    CK_INVALID_HANDLE);
1752 
1753 	if (reset_provider)
1754 		pkcs11_del_provider(provider_id);
1755 
1756 	return (k);
1757 }
1758 
1759 struct sshkey *
1760 pkcs11_destroy_keypair(char *provider_id, char *pin, unsigned long slotidx,
1761     unsigned char keyid, u_int32_t *err)
1762 {
1763 	struct pkcs11_provider	*p = NULL;
1764 	struct pkcs11_slotinfo	*si;
1765 	struct sshkey		*k = NULL;
1766 	int			 reset_pin = 0, reset_provider = 0;
1767 	CK_ULONG		 nattrs;
1768 	CK_FUNCTION_LIST	*f;
1769 	CK_SESSION_HANDLE	 session;
1770 	CK_ATTRIBUTE		 attrs[16];
1771 	CK_OBJECT_CLASS		 key_class;
1772 	CK_KEY_TYPE		 key_type;
1773 	CK_OBJECT_HANDLE	 obj = CK_INVALID_HANDLE;
1774 	CK_RV			 rv;
1775 
1776 	*err = 0;
1777 
1778 	if ((p = pkcs11_provider_lookup(provider_id)) != NULL) {
1779 		debug_f("using provider \"%s\"", provider_id);
1780 	} else if (pkcs11_register_provider(provider_id, pin, NULL, NULL, &p,
1781 	    CKU_SO) < 0) {
1782 		debug_f("could not register provider %s",
1783 		    provider_id);
1784 		goto out;
1785 	} else
1786 		reset_provider = 1;
1787 
1788 	f = p->function_list;
1789 	si = &p->slotinfo[slotidx];
1790 	session = si->session;
1791 
1792 	if ((rv = f->C_SetOperationState(session , pin, strlen(pin),
1793 	    CK_INVALID_HANDLE, CK_INVALID_HANDLE)) != CKR_OK) {
1794 		debug_f("could not supply SO pin: %lu", rv);
1795 		reset_pin = 0;
1796 	} else
1797 		reset_pin = 1;
1798 
1799 	/* private key */
1800 	nattrs = 0;
1801 	key_class = CKO_PRIVATE_KEY;
1802 	FILL_ATTR(attrs, nattrs, CKA_CLASS, &key_class, sizeof(key_class));
1803 	FILL_ATTR(attrs, nattrs, CKA_ID, &keyid, sizeof(keyid));
1804 
1805 	if (pkcs11_find(p, slotidx, attrs, nattrs, &obj) == 0 &&
1806 	    obj != CK_INVALID_HANDLE) {
1807 		if ((rv = f->C_DestroyObject(session, obj)) != CKR_OK) {
1808 			debug_f("could not destroy private key 0x%hhx",
1809 			    keyid);
1810 			*err = rv;
1811 			goto out;
1812 		}
1813 	}
1814 
1815 	/* public key */
1816 	nattrs = 0;
1817 	key_class = CKO_PUBLIC_KEY;
1818 	FILL_ATTR(attrs, nattrs, CKA_CLASS, &key_class, sizeof(key_class));
1819 	FILL_ATTR(attrs, nattrs, CKA_ID, &keyid, sizeof(keyid));
1820 
1821 	if (pkcs11_find(p, slotidx, attrs, nattrs, &obj) == 0 &&
1822 	    obj != CK_INVALID_HANDLE) {
1823 
1824 		/* get key type */
1825 		nattrs = 0;
1826 		FILL_ATTR(attrs, nattrs, CKA_KEY_TYPE, &key_type,
1827 		    sizeof(key_type));
1828 		rv = f->C_GetAttributeValue(session, obj, attrs, nattrs);
1829 		if (rv != CKR_OK) {
1830 			debug_f("could not get key type of public key 0x%hhx",
1831 			    keyid);
1832 			*err = rv;
1833 			key_type = -1;
1834 		}
1835 		if (key_type == CKK_RSA)
1836 			k = pkcs11_fetch_rsa_pubkey(p, slotidx, &obj);
1837 		else if (key_type == CKK_ECDSA)
1838 			k = pkcs11_fetch_ecdsa_pubkey(p, slotidx, &obj);
1839 
1840 		if ((rv = f->C_DestroyObject(session, obj)) != CKR_OK) {
1841 			debug_f("could not destroy public key 0x%hhx", keyid);
1842 			*err = rv;
1843 			goto out;
1844 		}
1845 	}
1846 
1847 out:
1848 	if (reset_pin)
1849 		f->C_SetOperationState(session , NULL, 0, CK_INVALID_HANDLE,
1850 		    CK_INVALID_HANDLE);
1851 
1852 	if (reset_provider)
1853 		pkcs11_del_provider(provider_id);
1854 
1855 	return (k);
1856 }
1857 #endif /* WITH_PKCS11_KEYGEN */
1858 #else /* ENABLE_PKCS11 */
1859 
1860 #include <sys/types.h>
1861 #include <stdarg.h>
1862 #include <stdio.h>
1863 
1864 #include "log.h"
1865 #include "sshkey.h"
1866 
1867 int
1868 pkcs11_init(int interactive)
1869 {
1870 	error("%s: dlopen() not supported", __func__);
1871 	return (-1);
1872 }
1873 
1874 int
1875 pkcs11_add_provider(char *provider_id, char *pin, struct sshkey ***keyp,
1876     char ***labelsp)
1877 {
1878 	error("%s: dlopen() not supported", __func__);
1879 	return (-1);
1880 }
1881 
1882 void
1883 pkcs11_terminate(void)
1884 {
1885 	error("%s: dlopen() not supported", __func__);
1886 }
1887 #endif /* ENABLE_PKCS11 */
1888