1 /* $OpenBSD: ssh-pkcs11.c,v 1.64 2024/09/20 02:00:46 jsg 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 <sys/types.h>
20 #include <sys/queue.h>
21 #include <stdarg.h>
22 #include <stdio.h>
23
24 #include <ctype.h>
25 #include <string.h>
26 #include <dlfcn.h>
27
28 #include <openssl/ecdsa.h>
29 #include <openssl/x509.h>
30 #include <openssl/err.h>
31
32 #define CRYPTOKI_COMPAT
33 #include "pkcs11.h"
34
35 #include "log.h"
36 #include "misc.h"
37 #include "sshkey.h"
38 #include "ssh-pkcs11.h"
39 #include "digest.h"
40 #include "xmalloc.h"
41
42 struct pkcs11_slotinfo {
43 CK_TOKEN_INFO token;
44 CK_SESSION_HANDLE session;
45 int logged_in;
46 };
47
48 struct pkcs11_provider {
49 char *name;
50 void *handle;
51 CK_FUNCTION_LIST *function_list;
52 CK_INFO info;
53 CK_ULONG nslots;
54 CK_SLOT_ID *slotlist;
55 struct pkcs11_slotinfo *slotinfo;
56 int valid;
57 int refcount;
58 TAILQ_ENTRY(pkcs11_provider) next;
59 };
60
61 TAILQ_HEAD(, pkcs11_provider) pkcs11_providers;
62
63 struct pkcs11_key {
64 struct pkcs11_provider *provider;
65 CK_ULONG slotidx;
66 char *keyid;
67 int keyid_len;
68 };
69
70 int pkcs11_interactive = 0;
71
72 #ifdef HAVE_DLOPEN
73 static void
ossl_error(const char * msg)74 ossl_error(const char *msg)
75 {
76 unsigned long e;
77
78 error_f("%s", msg);
79 while ((e = ERR_get_error()) != 0)
80 error_f("libcrypto error: %s", ERR_error_string(e, NULL));
81 }
82 #endif
83
84 int
pkcs11_init(int interactive)85 pkcs11_init(int interactive)
86 {
87 pkcs11_interactive = interactive;
88 TAILQ_INIT(&pkcs11_providers);
89 return (0);
90 }
91
92 /*
93 * finalize a provider shared library, it's no longer usable.
94 * however, there might still be keys referencing this provider,
95 * so the actual freeing of memory is handled by pkcs11_provider_unref().
96 * this is called when a provider gets unregistered.
97 */
98 static void
pkcs11_provider_finalize(struct pkcs11_provider * p)99 pkcs11_provider_finalize(struct pkcs11_provider *p)
100 {
101 CK_RV rv;
102 CK_ULONG i;
103
104 debug_f("provider \"%s\" refcount %d valid %d",
105 p->name, p->refcount, p->valid);
106 if (!p->valid)
107 return;
108 for (i = 0; i < p->nslots; i++) {
109 if (p->slotinfo[i].session &&
110 (rv = p->function_list->C_CloseSession(
111 p->slotinfo[i].session)) != CKR_OK)
112 error("C_CloseSession failed: %lu", rv);
113 }
114 if ((rv = p->function_list->C_Finalize(NULL)) != CKR_OK)
115 error("C_Finalize failed: %lu", rv);
116 p->valid = 0;
117 p->function_list = NULL;
118 #ifdef HAVE_DLOPEN
119 dlclose(p->handle);
120 #endif
121 }
122
123 /*
124 * remove a reference to the provider.
125 * called when a key gets destroyed or when the provider is unregistered.
126 */
127 static void
pkcs11_provider_unref(struct pkcs11_provider * p)128 pkcs11_provider_unref(struct pkcs11_provider *p)
129 {
130 debug_f("provider \"%s\" refcount %d", p->name, p->refcount);
131 if (--p->refcount <= 0) {
132 if (p->valid)
133 error_f("provider \"%s\" still valid", p->name);
134 free(p->name);
135 free(p->slotlist);
136 free(p->slotinfo);
137 free(p);
138 }
139 }
140
141 /* unregister all providers, keys might still point to the providers */
142 void
pkcs11_terminate(void)143 pkcs11_terminate(void)
144 {
145 struct pkcs11_provider *p;
146
147 while ((p = TAILQ_FIRST(&pkcs11_providers)) != NULL) {
148 TAILQ_REMOVE(&pkcs11_providers, p, next);
149 pkcs11_provider_finalize(p);
150 pkcs11_provider_unref(p);
151 }
152 }
153
154 /* lookup provider by name */
155 static struct pkcs11_provider *
pkcs11_provider_lookup(char * provider_id)156 pkcs11_provider_lookup(char *provider_id)
157 {
158 struct pkcs11_provider *p;
159
160 TAILQ_FOREACH(p, &pkcs11_providers, next) {
161 debug("check provider \"%s\"", p->name);
162 if (!strcmp(provider_id, p->name))
163 return (p);
164 }
165 return (NULL);
166 }
167
168 /* unregister provider by name */
169 int
pkcs11_del_provider(char * provider_id)170 pkcs11_del_provider(char *provider_id)
171 {
172 struct pkcs11_provider *p;
173
174 if ((p = pkcs11_provider_lookup(provider_id)) != NULL) {
175 TAILQ_REMOVE(&pkcs11_providers, p, next);
176 pkcs11_provider_finalize(p);
177 pkcs11_provider_unref(p);
178 return (0);
179 }
180 return (-1);
181 }
182
183 #ifdef HAVE_DLOPEN
184 static RSA_METHOD *rsa_method;
185 static int rsa_idx = 0;
186 static EC_KEY_METHOD *ec_key_method;
187 static int ec_key_idx = 0;
188
189 /* release a wrapped object */
190 static void
pkcs11_k11_free(void * parent,void * ptr,CRYPTO_EX_DATA * ad,int idx,long argl,void * argp)191 pkcs11_k11_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad, int idx,
192 long argl, void *argp)
193 {
194 struct pkcs11_key *k11 = ptr;
195
196 debug_f("parent %p ptr %p idx %d", parent, ptr, idx);
197 if (k11 == NULL)
198 return;
199 if (k11->provider)
200 pkcs11_provider_unref(k11->provider);
201 free(k11->keyid);
202 free(k11);
203 }
204
205 /* find a single 'obj' for given attributes */
206 static int
pkcs11_find(struct pkcs11_provider * p,CK_ULONG slotidx,CK_ATTRIBUTE * attr,CK_ULONG nattr,CK_OBJECT_HANDLE * obj)207 pkcs11_find(struct pkcs11_provider *p, CK_ULONG slotidx, CK_ATTRIBUTE *attr,
208 CK_ULONG nattr, CK_OBJECT_HANDLE *obj)
209 {
210 CK_FUNCTION_LIST *f;
211 CK_SESSION_HANDLE session;
212 CK_ULONG nfound = 0;
213 CK_RV rv;
214 int ret = -1;
215
216 f = p->function_list;
217 session = p->slotinfo[slotidx].session;
218 if ((rv = f->C_FindObjectsInit(session, attr, nattr)) != CKR_OK) {
219 error("C_FindObjectsInit failed (nattr %lu): %lu", nattr, rv);
220 return (-1);
221 }
222 if ((rv = f->C_FindObjects(session, obj, 1, &nfound)) != CKR_OK ||
223 nfound != 1) {
224 debug("C_FindObjects failed (nfound %lu nattr %lu): %lu",
225 nfound, nattr, rv);
226 } else
227 ret = 0;
228 if ((rv = f->C_FindObjectsFinal(session)) != CKR_OK)
229 error("C_FindObjectsFinal failed: %lu", rv);
230 return (ret);
231 }
232
233 static int
pkcs11_login_slot(struct pkcs11_provider * provider,struct pkcs11_slotinfo * si,CK_USER_TYPE type)234 pkcs11_login_slot(struct pkcs11_provider *provider, struct pkcs11_slotinfo *si,
235 CK_USER_TYPE type)
236 {
237 char *pin = NULL, prompt[1024];
238 CK_RV rv;
239
240 if (provider == NULL || si == NULL || !provider->valid) {
241 error("no pkcs11 (valid) provider found");
242 return (-1);
243 }
244
245 if (!pkcs11_interactive) {
246 error("need pin entry%s",
247 (si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH) ?
248 " on reader keypad" : "");
249 return (-1);
250 }
251 if (si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH)
252 verbose("Deferring PIN entry to reader keypad.");
253 else {
254 snprintf(prompt, sizeof(prompt), "Enter PIN for '%s': ",
255 si->token.label);
256 if ((pin = read_passphrase(prompt, RP_ALLOW_EOF)) == NULL) {
257 debug_f("no pin specified");
258 return (-1); /* bail out */
259 }
260 }
261 rv = provider->function_list->C_Login(si->session, type, (u_char *)pin,
262 (pin != NULL) ? strlen(pin) : 0);
263 if (pin != NULL)
264 freezero(pin, strlen(pin));
265
266 switch (rv) {
267 case CKR_OK:
268 case CKR_USER_ALREADY_LOGGED_IN:
269 /* success */
270 break;
271 case CKR_PIN_LEN_RANGE:
272 error("PKCS#11 login failed: PIN length out of range");
273 return -1;
274 case CKR_PIN_INCORRECT:
275 error("PKCS#11 login failed: PIN incorrect");
276 return -1;
277 case CKR_PIN_LOCKED:
278 error("PKCS#11 login failed: PIN locked");
279 return -1;
280 default:
281 error("PKCS#11 login failed: error %lu", rv);
282 return -1;
283 }
284 si->logged_in = 1;
285 return (0);
286 }
287
288 static int
pkcs11_login(struct pkcs11_key * k11,CK_USER_TYPE type)289 pkcs11_login(struct pkcs11_key *k11, CK_USER_TYPE type)
290 {
291 if (k11 == NULL || k11->provider == NULL || !k11->provider->valid) {
292 error("no pkcs11 (valid) provider found");
293 return (-1);
294 }
295
296 return pkcs11_login_slot(k11->provider,
297 &k11->provider->slotinfo[k11->slotidx], type);
298 }
299
300
301 static int
pkcs11_check_obj_bool_attrib(struct pkcs11_key * k11,CK_OBJECT_HANDLE obj,CK_ATTRIBUTE_TYPE type,int * val)302 pkcs11_check_obj_bool_attrib(struct pkcs11_key *k11, CK_OBJECT_HANDLE obj,
303 CK_ATTRIBUTE_TYPE type, int *val)
304 {
305 struct pkcs11_slotinfo *si;
306 CK_FUNCTION_LIST *f;
307 CK_BBOOL flag = 0;
308 CK_ATTRIBUTE attr;
309 CK_RV rv;
310
311 *val = 0;
312
313 if (!k11->provider || !k11->provider->valid) {
314 error("no pkcs11 (valid) provider found");
315 return (-1);
316 }
317
318 f = k11->provider->function_list;
319 si = &k11->provider->slotinfo[k11->slotidx];
320
321 attr.type = type;
322 attr.pValue = &flag;
323 attr.ulValueLen = sizeof(flag);
324
325 rv = f->C_GetAttributeValue(si->session, obj, &attr, 1);
326 if (rv != CKR_OK) {
327 error("C_GetAttributeValue failed: %lu", rv);
328 return (-1);
329 }
330 *val = flag != 0;
331 debug_f("provider \"%s\" slot %lu object %lu: attrib %lu = %d",
332 k11->provider->name, k11->slotidx, obj, type, *val);
333 return (0);
334 }
335
336 static int
pkcs11_get_key(struct pkcs11_key * k11,CK_MECHANISM_TYPE mech_type)337 pkcs11_get_key(struct pkcs11_key *k11, CK_MECHANISM_TYPE mech_type)
338 {
339 struct pkcs11_slotinfo *si;
340 CK_FUNCTION_LIST *f;
341 CK_OBJECT_HANDLE obj;
342 CK_RV rv;
343 CK_OBJECT_CLASS private_key_class;
344 CK_BBOOL true_val;
345 CK_MECHANISM mech;
346 CK_ATTRIBUTE key_filter[3];
347 int always_auth = 0;
348 int did_login = 0;
349
350 if (!k11->provider || !k11->provider->valid) {
351 error("no pkcs11 (valid) provider found");
352 return (-1);
353 }
354
355 f = k11->provider->function_list;
356 si = &k11->provider->slotinfo[k11->slotidx];
357
358 if ((si->token.flags & CKF_LOGIN_REQUIRED) && !si->logged_in) {
359 if (pkcs11_login(k11, CKU_USER) < 0) {
360 error("login failed");
361 return (-1);
362 }
363 did_login = 1;
364 }
365
366 memset(&key_filter, 0, sizeof(key_filter));
367 private_key_class = CKO_PRIVATE_KEY;
368 key_filter[0].type = CKA_CLASS;
369 key_filter[0].pValue = &private_key_class;
370 key_filter[0].ulValueLen = sizeof(private_key_class);
371
372 key_filter[1].type = CKA_ID;
373 key_filter[1].pValue = k11->keyid;
374 key_filter[1].ulValueLen = k11->keyid_len;
375
376 true_val = CK_TRUE;
377 key_filter[2].type = CKA_SIGN;
378 key_filter[2].pValue = &true_val;
379 key_filter[2].ulValueLen = sizeof(true_val);
380
381 /* try to find object w/CKA_SIGN first, retry w/o */
382 if (pkcs11_find(k11->provider, k11->slotidx, key_filter, 3, &obj) < 0 &&
383 pkcs11_find(k11->provider, k11->slotidx, key_filter, 2, &obj) < 0) {
384 error("cannot find private key");
385 return (-1);
386 }
387
388 memset(&mech, 0, sizeof(mech));
389 mech.mechanism = mech_type;
390 mech.pParameter = NULL_PTR;
391 mech.ulParameterLen = 0;
392
393 if ((rv = f->C_SignInit(si->session, &mech, obj)) != CKR_OK) {
394 error("C_SignInit failed: %lu", rv);
395 return (-1);
396 }
397
398 pkcs11_check_obj_bool_attrib(k11, obj, CKA_ALWAYS_AUTHENTICATE,
399 &always_auth); /* ignore errors here */
400 if (always_auth && !did_login) {
401 debug_f("always-auth key");
402 if (pkcs11_login(k11, CKU_CONTEXT_SPECIFIC) < 0) {
403 error("login failed for always-auth key");
404 return (-1);
405 }
406 }
407
408 return (0);
409 }
410
411 /* openssl callback doing the actual signing operation */
412 static int
pkcs11_rsa_private_encrypt(int flen,const u_char * from,u_char * to,RSA * rsa,int padding)413 pkcs11_rsa_private_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
414 int padding)
415 {
416 struct pkcs11_key *k11;
417 struct pkcs11_slotinfo *si;
418 CK_FUNCTION_LIST *f;
419 CK_ULONG tlen = 0;
420 CK_RV rv;
421 int rval = -1;
422
423 if ((k11 = RSA_get_ex_data(rsa, rsa_idx)) == NULL) {
424 error("RSA_get_ex_data failed");
425 return (-1);
426 }
427
428 if (pkcs11_get_key(k11, CKM_RSA_PKCS) == -1) {
429 error("pkcs11_get_key failed");
430 return (-1);
431 }
432
433 f = k11->provider->function_list;
434 si = &k11->provider->slotinfo[k11->slotidx];
435 tlen = RSA_size(rsa);
436
437 /* XXX handle CKR_BUFFER_TOO_SMALL */
438 rv = f->C_Sign(si->session, (CK_BYTE *)from, flen, to, &tlen);
439 if (rv == CKR_OK)
440 rval = tlen;
441 else
442 error("C_Sign failed: %lu", rv);
443
444 return (rval);
445 }
446
447 static int
pkcs11_rsa_private_decrypt(int flen,const u_char * from,u_char * to,RSA * rsa,int padding)448 pkcs11_rsa_private_decrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
449 int padding)
450 {
451 return (-1);
452 }
453
454 static int
pkcs11_rsa_start_wrapper(void)455 pkcs11_rsa_start_wrapper(void)
456 {
457 if (rsa_method != NULL)
458 return (0);
459 rsa_method = RSA_meth_dup(RSA_get_default_method());
460 if (rsa_method == NULL)
461 return (-1);
462 rsa_idx = RSA_get_ex_new_index(0, "ssh-pkcs11-rsa",
463 NULL, NULL, pkcs11_k11_free);
464 if (rsa_idx == -1)
465 return (-1);
466 if (!RSA_meth_set1_name(rsa_method, "pkcs11") ||
467 !RSA_meth_set_priv_enc(rsa_method, pkcs11_rsa_private_encrypt) ||
468 !RSA_meth_set_priv_dec(rsa_method, pkcs11_rsa_private_decrypt)) {
469 error_f("setup pkcs11 method failed");
470 return (-1);
471 }
472 return (0);
473 }
474
475 /* redirect private key operations for rsa key to pkcs11 token */
476 static int
pkcs11_rsa_wrap(struct pkcs11_provider * provider,CK_ULONG slotidx,CK_ATTRIBUTE * keyid_attrib,RSA * rsa)477 pkcs11_rsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
478 CK_ATTRIBUTE *keyid_attrib, RSA *rsa)
479 {
480 struct pkcs11_key *k11;
481
482 if (pkcs11_rsa_start_wrapper() == -1)
483 return (-1);
484
485 k11 = xcalloc(1, sizeof(*k11));
486 k11->provider = provider;
487 provider->refcount++; /* provider referenced by RSA key */
488 k11->slotidx = slotidx;
489 /* identify key object on smartcard */
490 k11->keyid_len = keyid_attrib->ulValueLen;
491 if (k11->keyid_len > 0) {
492 k11->keyid = xmalloc(k11->keyid_len);
493 memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
494 }
495
496 if (RSA_set_method(rsa, rsa_method) != 1)
497 fatal_f("RSA_set_method failed");
498 if (RSA_set_ex_data(rsa, rsa_idx, k11) != 1)
499 fatal_f("RSA_set_ex_data failed");
500 return (0);
501 }
502
503 /* openssl callback doing the actual signing operation */
504 static ECDSA_SIG *
ecdsa_do_sign(const unsigned char * dgst,int dgst_len,const BIGNUM * inv,const BIGNUM * rp,EC_KEY * ec)505 ecdsa_do_sign(const unsigned char *dgst, int dgst_len, const BIGNUM *inv,
506 const BIGNUM *rp, EC_KEY *ec)
507 {
508 struct pkcs11_key *k11;
509 struct pkcs11_slotinfo *si;
510 CK_FUNCTION_LIST *f;
511 CK_ULONG siglen = 0, bnlen;
512 CK_RV rv;
513 ECDSA_SIG *ret = NULL;
514 u_char *sig;
515 BIGNUM *r = NULL, *s = NULL;
516
517 if ((k11 = EC_KEY_get_ex_data(ec, ec_key_idx)) == NULL) {
518 ossl_error("EC_KEY_get_ex_data failed for ec");
519 return (NULL);
520 }
521
522 if (pkcs11_get_key(k11, CKM_ECDSA) == -1) {
523 error("pkcs11_get_key failed");
524 return (NULL);
525 }
526
527 f = k11->provider->function_list;
528 si = &k11->provider->slotinfo[k11->slotidx];
529
530 siglen = ECDSA_size(ec);
531 sig = xmalloc(siglen);
532
533 /* XXX handle CKR_BUFFER_TOO_SMALL */
534 rv = f->C_Sign(si->session, (CK_BYTE *)dgst, dgst_len, sig, &siglen);
535 if (rv != CKR_OK) {
536 error("C_Sign failed: %lu", rv);
537 goto done;
538 }
539 if (siglen < 64 || siglen > 132 || siglen % 2) {
540 error_f("bad signature length: %lu", (u_long)siglen);
541 goto done;
542 }
543 bnlen = siglen/2;
544 if ((ret = ECDSA_SIG_new()) == NULL) {
545 error("ECDSA_SIG_new failed");
546 goto done;
547 }
548 if ((r = BN_bin2bn(sig, bnlen, NULL)) == NULL ||
549 (s = BN_bin2bn(sig+bnlen, bnlen, NULL)) == NULL) {
550 ossl_error("BN_bin2bn failed");
551 ECDSA_SIG_free(ret);
552 ret = NULL;
553 goto done;
554 }
555 if (!ECDSA_SIG_set0(ret, r, s)) {
556 error_f("ECDSA_SIG_set0 failed");
557 ECDSA_SIG_free(ret);
558 ret = NULL;
559 goto done;
560 }
561 r = s = NULL; /* now owned by ret */
562 /* success */
563 done:
564 BN_free(r);
565 BN_free(s);
566 free(sig);
567
568 return (ret);
569 }
570
571 static int
pkcs11_ecdsa_start_wrapper(void)572 pkcs11_ecdsa_start_wrapper(void)
573 {
574 int (*orig_sign)(int, const unsigned char *, int, unsigned char *,
575 unsigned int *, const BIGNUM *, const BIGNUM *, EC_KEY *) = NULL;
576
577 if (ec_key_method != NULL)
578 return (0);
579 ec_key_idx = EC_KEY_get_ex_new_index(0, "ssh-pkcs11-ecdsa",
580 NULL, NULL, pkcs11_k11_free);
581 if (ec_key_idx == -1)
582 return (-1);
583 ec_key_method = EC_KEY_METHOD_new(EC_KEY_OpenSSL());
584 if (ec_key_method == NULL)
585 return (-1);
586 EC_KEY_METHOD_get_sign(ec_key_method, &orig_sign, NULL, NULL);
587 EC_KEY_METHOD_set_sign(ec_key_method, orig_sign, NULL, ecdsa_do_sign);
588 return (0);
589 }
590
591 static int
pkcs11_ecdsa_wrap(struct pkcs11_provider * provider,CK_ULONG slotidx,CK_ATTRIBUTE * keyid_attrib,EC_KEY * ec)592 pkcs11_ecdsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
593 CK_ATTRIBUTE *keyid_attrib, EC_KEY *ec)
594 {
595 struct pkcs11_key *k11;
596
597 if (pkcs11_ecdsa_start_wrapper() == -1)
598 return (-1);
599
600 k11 = xcalloc(1, sizeof(*k11));
601 k11->provider = provider;
602 provider->refcount++; /* provider referenced by ECDSA key */
603 k11->slotidx = slotidx;
604 /* identify key object on smartcard */
605 k11->keyid_len = keyid_attrib->ulValueLen;
606 if (k11->keyid_len > 0) {
607 k11->keyid = xmalloc(k11->keyid_len);
608 memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
609 }
610 if (EC_KEY_set_method(ec, ec_key_method) != 1)
611 fatal_f("EC_KEY_set_method failed");
612 if (EC_KEY_set_ex_data(ec, ec_key_idx, k11) != 1)
613 fatal_f("EC_KEY_set_ex_data failed");
614
615 return (0);
616 }
617
618 /* remove trailing spaces */
619 static char *
rmspace(u_char * buf,size_t len)620 rmspace(u_char *buf, size_t len)
621 {
622 size_t i;
623
624 if (len == 0)
625 return buf;
626 for (i = len - 1; i > 0; i--)
627 if (buf[i] == ' ')
628 buf[i] = '\0';
629 else
630 break;
631 return buf;
632 }
633 /* Used to printf fixed-width, space-padded, unterminated strings using %.*s */
634 #define RMSPACE(s) (int)sizeof(s), rmspace(s, sizeof(s))
635
636 /*
637 * open a pkcs11 session and login if required.
638 * if pin == NULL we delay login until key use
639 */
640 static int
pkcs11_open_session(struct pkcs11_provider * p,CK_ULONG slotidx,char * pin,CK_ULONG user)641 pkcs11_open_session(struct pkcs11_provider *p, CK_ULONG slotidx, char *pin,
642 CK_ULONG user)
643 {
644 struct pkcs11_slotinfo *si;
645 CK_FUNCTION_LIST *f;
646 CK_RV rv;
647 CK_SESSION_HANDLE session;
648 int login_required, ret;
649
650 f = p->function_list;
651 si = &p->slotinfo[slotidx];
652
653 login_required = si->token.flags & CKF_LOGIN_REQUIRED;
654
655 /* fail early before opening session */
656 if (login_required && !pkcs11_interactive &&
657 (pin == NULL || strlen(pin) == 0)) {
658 error("pin required");
659 return (-SSH_PKCS11_ERR_PIN_REQUIRED);
660 }
661 if ((rv = f->C_OpenSession(p->slotlist[slotidx], CKF_RW_SESSION|
662 CKF_SERIAL_SESSION, NULL, NULL, &session)) != CKR_OK) {
663 error("C_OpenSession failed: %lu", rv);
664 return (-1);
665 }
666 if (login_required && pin != NULL && strlen(pin) != 0) {
667 rv = f->C_Login(session, user, (u_char *)pin, strlen(pin));
668 if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
669 error("C_Login failed: %lu", rv);
670 ret = (rv == CKR_PIN_LOCKED) ?
671 -SSH_PKCS11_ERR_PIN_LOCKED :
672 -SSH_PKCS11_ERR_LOGIN_FAIL;
673 if ((rv = f->C_CloseSession(session)) != CKR_OK)
674 error("C_CloseSession failed: %lu", rv);
675 return (ret);
676 }
677 si->logged_in = 1;
678 }
679 si->session = session;
680 return (0);
681 }
682
683 static int
pkcs11_key_included(struct sshkey *** keysp,int * nkeys,struct sshkey * key)684 pkcs11_key_included(struct sshkey ***keysp, int *nkeys, struct sshkey *key)
685 {
686 int i;
687
688 for (i = 0; i < *nkeys; i++)
689 if (sshkey_equal(key, (*keysp)[i]))
690 return (1);
691 return (0);
692 }
693
694 static struct sshkey *
pkcs11_fetch_ecdsa_pubkey(struct pkcs11_provider * p,CK_ULONG slotidx,CK_OBJECT_HANDLE * obj)695 pkcs11_fetch_ecdsa_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
696 CK_OBJECT_HANDLE *obj)
697 {
698 CK_ATTRIBUTE key_attr[3];
699 CK_SESSION_HANDLE session;
700 CK_FUNCTION_LIST *f = NULL;
701 CK_RV rv;
702 ASN1_OCTET_STRING *octet = NULL;
703 EC_KEY *ec = NULL;
704 EC_GROUP *group = NULL;
705 struct sshkey *key = NULL;
706 const unsigned char *attrp = NULL;
707 int i;
708 int nid;
709
710 memset(&key_attr, 0, sizeof(key_attr));
711 key_attr[0].type = CKA_ID;
712 key_attr[1].type = CKA_EC_POINT;
713 key_attr[2].type = CKA_EC_PARAMS;
714
715 session = p->slotinfo[slotidx].session;
716 f = p->function_list;
717
718 /* figure out size of the attributes */
719 rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
720 if (rv != CKR_OK) {
721 error("C_GetAttributeValue failed: %lu", rv);
722 return (NULL);
723 }
724
725 /*
726 * Allow CKA_ID (always first attribute) to be empty, but
727 * ensure that none of the others are zero length.
728 * XXX assumes CKA_ID is always first.
729 */
730 if (key_attr[1].ulValueLen == 0 ||
731 key_attr[2].ulValueLen == 0) {
732 error("invalid attribute length");
733 return (NULL);
734 }
735
736 /* allocate buffers for attributes */
737 for (i = 0; i < 3; i++)
738 if (key_attr[i].ulValueLen > 0)
739 key_attr[i].pValue = xcalloc(1, key_attr[i].ulValueLen);
740
741 /* retrieve ID, public point and curve parameters of EC key */
742 rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
743 if (rv != CKR_OK) {
744 error("C_GetAttributeValue failed: %lu", rv);
745 goto fail;
746 }
747
748 ec = EC_KEY_new();
749 if (ec == NULL) {
750 error("EC_KEY_new failed");
751 goto fail;
752 }
753
754 attrp = key_attr[2].pValue;
755 group = d2i_ECPKParameters(NULL, &attrp, key_attr[2].ulValueLen);
756 if (group == NULL) {
757 ossl_error("d2i_ECPKParameters failed");
758 goto fail;
759 }
760
761 if (EC_KEY_set_group(ec, group) == 0) {
762 ossl_error("EC_KEY_set_group failed");
763 goto fail;
764 }
765
766 if (key_attr[1].ulValueLen <= 2) {
767 error("CKA_EC_POINT too small");
768 goto fail;
769 }
770
771 attrp = key_attr[1].pValue;
772 octet = d2i_ASN1_OCTET_STRING(NULL, &attrp, key_attr[1].ulValueLen);
773 if (octet == NULL) {
774 ossl_error("d2i_ASN1_OCTET_STRING failed");
775 goto fail;
776 }
777 attrp = octet->data;
778 if (o2i_ECPublicKey(&ec, &attrp, octet->length) == NULL) {
779 ossl_error("o2i_ECPublicKey failed");
780 goto fail;
781 }
782
783 nid = sshkey_ecdsa_key_to_nid(ec);
784 if (nid < 0) {
785 error("couldn't get curve nid");
786 goto fail;
787 }
788
789 if (pkcs11_ecdsa_wrap(p, slotidx, &key_attr[0], ec))
790 goto fail;
791
792 key = sshkey_new(KEY_UNSPEC);
793 if (key == NULL) {
794 error("sshkey_new failed");
795 goto fail;
796 }
797
798 EVP_PKEY_free(key->pkey);
799 if ((key->pkey = EVP_PKEY_new()) == NULL)
800 fatal("EVP_PKEY_new failed");
801 if (EVP_PKEY_set1_EC_KEY(key->pkey, ec) != 1)
802 fatal("EVP_PKEY_set1_EC_KEY failed");
803 key->ecdsa_nid = nid;
804 key->type = KEY_ECDSA;
805 key->flags |= SSHKEY_FLAG_EXT;
806
807 fail:
808 for (i = 0; i < 3; i++)
809 free(key_attr[i].pValue);
810 if (ec)
811 EC_KEY_free(ec);
812 if (group)
813 EC_GROUP_free(group);
814 if (octet)
815 ASN1_OCTET_STRING_free(octet);
816
817 return (key);
818 }
819
820 static struct sshkey *
pkcs11_fetch_rsa_pubkey(struct pkcs11_provider * p,CK_ULONG slotidx,CK_OBJECT_HANDLE * obj)821 pkcs11_fetch_rsa_pubkey(struct pkcs11_provider *p, CK_ULONG slotidx,
822 CK_OBJECT_HANDLE *obj)
823 {
824 CK_ATTRIBUTE key_attr[3];
825 CK_SESSION_HANDLE session;
826 CK_FUNCTION_LIST *f = NULL;
827 CK_RV rv;
828 RSA *rsa = NULL;
829 BIGNUM *rsa_n, *rsa_e;
830 struct sshkey *key = NULL;
831 int i;
832
833 memset(&key_attr, 0, sizeof(key_attr));
834 key_attr[0].type = CKA_ID;
835 key_attr[1].type = CKA_MODULUS;
836 key_attr[2].type = CKA_PUBLIC_EXPONENT;
837
838 session = p->slotinfo[slotidx].session;
839 f = p->function_list;
840
841 /* figure out size of the attributes */
842 rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
843 if (rv != CKR_OK) {
844 error("C_GetAttributeValue failed: %lu", rv);
845 return (NULL);
846 }
847
848 /*
849 * Allow CKA_ID (always first attribute) to be empty, but
850 * ensure that none of the others are zero length.
851 * XXX assumes CKA_ID is always first.
852 */
853 if (key_attr[1].ulValueLen == 0 ||
854 key_attr[2].ulValueLen == 0) {
855 error("invalid attribute length");
856 return (NULL);
857 }
858
859 /* allocate buffers for attributes */
860 for (i = 0; i < 3; i++)
861 if (key_attr[i].ulValueLen > 0)
862 key_attr[i].pValue = xcalloc(1, key_attr[i].ulValueLen);
863
864 /* retrieve ID, modulus and public exponent of RSA key */
865 rv = f->C_GetAttributeValue(session, *obj, key_attr, 3);
866 if (rv != CKR_OK) {
867 error("C_GetAttributeValue failed: %lu", rv);
868 goto fail;
869 }
870
871 rsa = RSA_new();
872 if (rsa == NULL) {
873 error("RSA_new failed");
874 goto fail;
875 }
876
877 rsa_n = BN_bin2bn(key_attr[1].pValue, key_attr[1].ulValueLen, NULL);
878 rsa_e = BN_bin2bn(key_attr[2].pValue, key_attr[2].ulValueLen, NULL);
879 if (rsa_n == NULL || rsa_e == NULL) {
880 error("BN_bin2bn failed");
881 goto fail;
882 }
883 if (!RSA_set0_key(rsa, rsa_n, rsa_e, NULL))
884 fatal_f("set key");
885 rsa_n = rsa_e = NULL; /* transferred */
886
887 if (pkcs11_rsa_wrap(p, slotidx, &key_attr[0], rsa))
888 goto fail;
889
890 key = sshkey_new(KEY_UNSPEC);
891 if (key == NULL) {
892 error("sshkey_new failed");
893 goto fail;
894 }
895
896 EVP_PKEY_free(key->pkey);
897 if ((key->pkey = EVP_PKEY_new()) == NULL)
898 fatal("EVP_PKEY_new failed");
899 if (EVP_PKEY_set1_RSA(key->pkey, rsa) != 1)
900 fatal("EVP_PKEY_set1_RSA failed");
901 key->type = KEY_RSA;
902 key->flags |= SSHKEY_FLAG_EXT;
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
pkcs11_fetch_x509_pubkey(struct pkcs11_provider * p,CK_ULONG slotidx,CK_OBJECT_HANDLE * obj,struct sshkey ** keyp,char ** labelp)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 EC_KEY *ec = NULL;
925 struct sshkey *key = NULL;
926 int i;
927 int nid;
928 const u_char *cp;
929 char *subject = NULL;
930
931 *keyp = NULL;
932 *labelp = NULL;
933
934 memset(&cert_attr, 0, sizeof(cert_attr));
935 cert_attr[0].type = CKA_ID;
936 cert_attr[1].type = CKA_SUBJECT;
937 cert_attr[2].type = CKA_VALUE;
938
939 session = p->slotinfo[slotidx].session;
940 f = p->function_list;
941
942 /* figure out size of the attributes */
943 rv = f->C_GetAttributeValue(session, *obj, cert_attr, 3);
944 if (rv != CKR_OK) {
945 error("C_GetAttributeValue failed: %lu", rv);
946 return -1;
947 }
948
949 /*
950 * Allow CKA_ID (always first attribute) to be empty, but
951 * ensure that none of the others are zero length.
952 * XXX assumes CKA_ID is always first.
953 */
954 if (cert_attr[1].ulValueLen == 0 ||
955 cert_attr[2].ulValueLen == 0) {
956 error("invalid attribute length");
957 return -1;
958 }
959
960 /* allocate buffers for attributes */
961 for (i = 0; i < 3; i++)
962 if (cert_attr[i].ulValueLen > 0)
963 cert_attr[i].pValue = xcalloc(1, cert_attr[i].ulValueLen);
964
965 /* retrieve ID, subject and value of certificate */
966 rv = f->C_GetAttributeValue(session, *obj, cert_attr, 3);
967 if (rv != CKR_OK) {
968 error("C_GetAttributeValue failed: %lu", rv);
969 goto out;
970 }
971
972 /* Decode DER-encoded cert subject */
973 cp = cert_attr[1].pValue;
974 if ((x509_name = d2i_X509_NAME(NULL, &cp,
975 cert_attr[1].ulValueLen)) == NULL ||
976 (subject = X509_NAME_oneline(x509_name, NULL, 0)) == NULL)
977 subject = xstrdup("invalid subject");
978 X509_NAME_free(x509_name);
979
980 cp = cert_attr[2].pValue;
981 if ((x509 = d2i_X509(NULL, &cp, cert_attr[2].ulValueLen)) == NULL) {
982 error("d2i_x509 failed");
983 goto out;
984 }
985
986 if ((evp = X509_get_pubkey(x509)) == NULL) {
987 error("X509_get_pubkey failed");
988 goto out;
989 }
990
991 if (EVP_PKEY_base_id(evp) == EVP_PKEY_RSA) {
992 if (EVP_PKEY_get0_RSA(evp) == NULL) {
993 error("invalid x509; no rsa key");
994 goto out;
995 }
996 if ((rsa = RSAPublicKey_dup(EVP_PKEY_get0_RSA(evp))) == NULL) {
997 error("RSAPublicKey_dup failed");
998 goto out;
999 }
1000
1001 if (pkcs11_rsa_wrap(p, slotidx, &cert_attr[0], rsa))
1002 goto out;
1003
1004 key = sshkey_new(KEY_UNSPEC);
1005 if (key == NULL) {
1006 error("sshkey_new failed");
1007 goto out;
1008 }
1009
1010 EVP_PKEY_free(key->pkey);
1011 if ((key->pkey = EVP_PKEY_new()) == NULL)
1012 fatal("EVP_PKEY_new failed");
1013 if (EVP_PKEY_set1_RSA(key->pkey, rsa) != 1)
1014 fatal("EVP_PKEY_set1_RSA failed");
1015 key->type = KEY_RSA;
1016 key->flags |= SSHKEY_FLAG_EXT;
1017 } else if (EVP_PKEY_base_id(evp) == EVP_PKEY_EC) {
1018 if (EVP_PKEY_get0_EC_KEY(evp) == NULL) {
1019 error("invalid x509; no ec key");
1020 goto out;
1021 }
1022 if ((ec = EC_KEY_dup(EVP_PKEY_get0_EC_KEY(evp))) == NULL) {
1023 error("EC_KEY_dup failed");
1024 goto out;
1025 }
1026
1027 nid = sshkey_ecdsa_key_to_nid(ec);
1028 if (nid < 0) {
1029 error("couldn't get curve nid");
1030 goto out;
1031 }
1032
1033 if (pkcs11_ecdsa_wrap(p, slotidx, &cert_attr[0], ec))
1034 goto out;
1035
1036 key = sshkey_new(KEY_UNSPEC);
1037 if (key == NULL) {
1038 error("sshkey_new failed");
1039 goto out;
1040 }
1041
1042 EVP_PKEY_free(key->pkey);
1043 if ((key->pkey = EVP_PKEY_new()) == NULL)
1044 fatal("EVP_PKEY_new failed");
1045 if (EVP_PKEY_set1_EC_KEY(key->pkey, ec) != 1)
1046 fatal("EVP_PKEY_set1_EC_KEY failed");
1047 key->ecdsa_nid = nid;
1048 key->type = KEY_ECDSA;
1049 key->flags |= SSHKEY_FLAG_EXT;
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 EC_KEY_free(ec);
1060 if (key == NULL) {
1061 free(subject);
1062 return -1;
1063 }
1064 /* success */
1065 *keyp = key;
1066 *labelp = subject;
1067 return 0;
1068 }
1069
1070 #if 0
1071 static int
1072 have_rsa_key(const RSA *rsa)
1073 {
1074 const BIGNUM *rsa_n, *rsa_e;
1075
1076 RSA_get0_key(rsa, &rsa_n, &rsa_e, NULL);
1077 return rsa_n != NULL && rsa_e != NULL;
1078 }
1079 #endif
1080
1081 static void
note_key(struct pkcs11_provider * p,CK_ULONG slotidx,const char * context,struct sshkey * key)1082 note_key(struct pkcs11_provider *p, CK_ULONG slotidx, const char *context,
1083 struct sshkey *key)
1084 {
1085 char *fp;
1086
1087 if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
1088 SSH_FP_DEFAULT)) == NULL) {
1089 error_f("sshkey_fingerprint failed");
1090 return;
1091 }
1092 debug2("%s: provider %s slot %lu: %s %s", context, p->name,
1093 (u_long)slotidx, sshkey_type(key), fp);
1094 free(fp);
1095 }
1096
1097 /*
1098 * lookup certificates for token in slot identified by slotidx,
1099 * add 'wrapped' public keys to the 'keysp' array and increment nkeys.
1100 * keysp points to an (possibly empty) array with *nkeys keys.
1101 */
1102 static int
pkcs11_fetch_certs(struct pkcs11_provider * p,CK_ULONG slotidx,struct sshkey *** keysp,char *** labelsp,int * nkeys)1103 pkcs11_fetch_certs(struct pkcs11_provider *p, CK_ULONG slotidx,
1104 struct sshkey ***keysp, char ***labelsp, int *nkeys)
1105 {
1106 struct sshkey *key = NULL;
1107 CK_OBJECT_CLASS key_class;
1108 CK_ATTRIBUTE key_attr[1];
1109 CK_SESSION_HANDLE session;
1110 CK_FUNCTION_LIST *f = NULL;
1111 CK_RV rv;
1112 CK_OBJECT_HANDLE obj;
1113 CK_ULONG n = 0;
1114 int ret = -1;
1115 char *label;
1116
1117 memset(&key_attr, 0, sizeof(key_attr));
1118 memset(&obj, 0, sizeof(obj));
1119
1120 key_class = CKO_CERTIFICATE;
1121 key_attr[0].type = CKA_CLASS;
1122 key_attr[0].pValue = &key_class;
1123 key_attr[0].ulValueLen = sizeof(key_class);
1124
1125 session = p->slotinfo[slotidx].session;
1126 f = p->function_list;
1127
1128 rv = f->C_FindObjectsInit(session, key_attr, 1);
1129 if (rv != CKR_OK) {
1130 error("C_FindObjectsInit failed: %lu", rv);
1131 goto fail;
1132 }
1133
1134 while (1) {
1135 CK_CERTIFICATE_TYPE ck_cert_type;
1136
1137 rv = f->C_FindObjects(session, &obj, 1, &n);
1138 if (rv != CKR_OK) {
1139 error("C_FindObjects failed: %lu", rv);
1140 goto fail;
1141 }
1142 if (n == 0)
1143 break;
1144
1145 memset(&ck_cert_type, 0, sizeof(ck_cert_type));
1146 memset(&key_attr, 0, sizeof(key_attr));
1147 key_attr[0].type = CKA_CERTIFICATE_TYPE;
1148 key_attr[0].pValue = &ck_cert_type;
1149 key_attr[0].ulValueLen = sizeof(ck_cert_type);
1150
1151 rv = f->C_GetAttributeValue(session, obj, key_attr, 1);
1152 if (rv != CKR_OK) {
1153 error("C_GetAttributeValue failed: %lu", rv);
1154 goto fail;
1155 }
1156
1157 key = NULL;
1158 label = NULL;
1159 switch (ck_cert_type) {
1160 case CKC_X_509:
1161 if (pkcs11_fetch_x509_pubkey(p, slotidx, &obj,
1162 &key, &label) != 0) {
1163 error("failed to fetch key");
1164 continue;
1165 }
1166 break;
1167 default:
1168 error("skipping unsupported certificate type %lu",
1169 ck_cert_type);
1170 continue;
1171 }
1172 note_key(p, slotidx, __func__, key);
1173 if (pkcs11_key_included(keysp, nkeys, key)) {
1174 debug2_f("key already included");
1175 sshkey_free(key);
1176 } else {
1177 /* expand key array and add key */
1178 *keysp = xrecallocarray(*keysp, *nkeys,
1179 *nkeys + 1, sizeof(struct sshkey *));
1180 (*keysp)[*nkeys] = key;
1181 if (labelsp != NULL) {
1182 *labelsp = xrecallocarray(*labelsp, *nkeys,
1183 *nkeys + 1, sizeof(char *));
1184 (*labelsp)[*nkeys] = xstrdup((char *)label);
1185 }
1186 *nkeys = *nkeys + 1;
1187 debug("have %d keys", *nkeys);
1188 }
1189 }
1190
1191 ret = 0;
1192 fail:
1193 rv = f->C_FindObjectsFinal(session);
1194 if (rv != CKR_OK) {
1195 error("C_FindObjectsFinal failed: %lu", rv);
1196 ret = -1;
1197 }
1198
1199 return (ret);
1200 }
1201
1202 /*
1203 * lookup public keys for token in slot identified by slotidx,
1204 * add 'wrapped' public keys to the 'keysp' array and increment nkeys.
1205 * keysp points to an (possibly empty) array with *nkeys keys.
1206 */
1207 static int
pkcs11_fetch_keys(struct pkcs11_provider * p,CK_ULONG slotidx,struct sshkey *** keysp,char *** labelsp,int * nkeys)1208 pkcs11_fetch_keys(struct pkcs11_provider *p, CK_ULONG slotidx,
1209 struct sshkey ***keysp, char ***labelsp, int *nkeys)
1210 {
1211 struct sshkey *key = NULL;
1212 CK_OBJECT_CLASS key_class;
1213 CK_ATTRIBUTE key_attr[2];
1214 CK_SESSION_HANDLE session;
1215 CK_FUNCTION_LIST *f = NULL;
1216 CK_RV rv;
1217 CK_OBJECT_HANDLE obj;
1218 CK_ULONG n = 0;
1219 int ret = -1;
1220
1221 memset(&key_attr, 0, sizeof(key_attr));
1222 memset(&obj, 0, sizeof(obj));
1223
1224 key_class = CKO_PUBLIC_KEY;
1225 key_attr[0].type = CKA_CLASS;
1226 key_attr[0].pValue = &key_class;
1227 key_attr[0].ulValueLen = sizeof(key_class);
1228
1229 session = p->slotinfo[slotidx].session;
1230 f = p->function_list;
1231
1232 rv = f->C_FindObjectsInit(session, key_attr, 1);
1233 if (rv != CKR_OK) {
1234 error("C_FindObjectsInit failed: %lu", rv);
1235 goto fail;
1236 }
1237
1238 while (1) {
1239 CK_KEY_TYPE ck_key_type;
1240 CK_UTF8CHAR label[256];
1241
1242 rv = f->C_FindObjects(session, &obj, 1, &n);
1243 if (rv != CKR_OK) {
1244 error("C_FindObjects failed: %lu", rv);
1245 goto fail;
1246 }
1247 if (n == 0)
1248 break;
1249
1250 memset(&ck_key_type, 0, sizeof(ck_key_type));
1251 memset(&key_attr, 0, sizeof(key_attr));
1252 key_attr[0].type = CKA_KEY_TYPE;
1253 key_attr[0].pValue = &ck_key_type;
1254 key_attr[0].ulValueLen = sizeof(ck_key_type);
1255 key_attr[1].type = CKA_LABEL;
1256 key_attr[1].pValue = &label;
1257 key_attr[1].ulValueLen = sizeof(label) - 1;
1258
1259 rv = f->C_GetAttributeValue(session, obj, key_attr, 2);
1260 if (rv != CKR_OK) {
1261 error("C_GetAttributeValue failed: %lu", rv);
1262 goto fail;
1263 }
1264
1265 label[key_attr[1].ulValueLen] = '\0';
1266
1267 switch (ck_key_type) {
1268 case CKK_RSA:
1269 key = pkcs11_fetch_rsa_pubkey(p, slotidx, &obj);
1270 break;
1271 case CKK_ECDSA:
1272 key = pkcs11_fetch_ecdsa_pubkey(p, slotidx, &obj);
1273 break;
1274 default:
1275 /* XXX print key type? */
1276 key = NULL;
1277 error("skipping unsupported key type");
1278 }
1279
1280 if (key == NULL) {
1281 error("failed to fetch key");
1282 continue;
1283 }
1284 note_key(p, slotidx, __func__, key);
1285 if (pkcs11_key_included(keysp, nkeys, key)) {
1286 debug2_f("key already included");
1287 sshkey_free(key);
1288 } else {
1289 /* expand key array and add key */
1290 *keysp = xrecallocarray(*keysp, *nkeys,
1291 *nkeys + 1, sizeof(struct sshkey *));
1292 (*keysp)[*nkeys] = key;
1293 if (labelsp != NULL) {
1294 *labelsp = xrecallocarray(*labelsp, *nkeys,
1295 *nkeys + 1, sizeof(char *));
1296 (*labelsp)[*nkeys] = xstrdup((char *)label);
1297 }
1298 *nkeys = *nkeys + 1;
1299 debug("have %d keys", *nkeys);
1300 }
1301 }
1302
1303 ret = 0;
1304 fail:
1305 rv = f->C_FindObjectsFinal(session);
1306 if (rv != CKR_OK) {
1307 error("C_FindObjectsFinal failed: %lu", rv);
1308 ret = -1;
1309 }
1310
1311 return (ret);
1312 }
1313
1314 #ifdef WITH_PKCS11_KEYGEN
1315 #define FILL_ATTR(attr, idx, typ, val, len) \
1316 { (attr[idx]).type=(typ); (attr[idx]).pValue=(val); (attr[idx]).ulValueLen=len; idx++; }
1317
1318 static struct sshkey *
pkcs11_rsa_generate_private_key(struct pkcs11_provider * p,CK_ULONG slotidx,char * label,CK_ULONG bits,CK_BYTE keyid,u_int32_t * err)1319 pkcs11_rsa_generate_private_key(struct pkcs11_provider *p, CK_ULONG slotidx,
1320 char *label, CK_ULONG bits, CK_BYTE keyid, u_int32_t *err)
1321 {
1322 struct pkcs11_slotinfo *si;
1323 char *plabel = label ? label : "";
1324 int npub = 0, npriv = 0;
1325 CK_RV rv;
1326 CK_FUNCTION_LIST *f;
1327 CK_SESSION_HANDLE session;
1328 CK_BBOOL true_val = CK_TRUE, false_val = CK_FALSE;
1329 CK_OBJECT_HANDLE pubKey, privKey;
1330 CK_ATTRIBUTE tpub[16], tpriv[16];
1331 CK_MECHANISM mech = {
1332 CKM_RSA_PKCS_KEY_PAIR_GEN, NULL_PTR, 0
1333 };
1334 CK_BYTE pubExponent[] = {
1335 0x01, 0x00, 0x01 /* RSA_F4 in bytes */
1336 };
1337
1338 *err = 0;
1339
1340 FILL_ATTR(tpub, npub, CKA_TOKEN, &true_val, sizeof(true_val));
1341 FILL_ATTR(tpub, npub, CKA_LABEL, plabel, strlen(plabel));
1342 FILL_ATTR(tpub, npub, CKA_ENCRYPT, &false_val, sizeof(false_val));
1343 FILL_ATTR(tpub, npub, CKA_VERIFY, &true_val, sizeof(true_val));
1344 FILL_ATTR(tpub, npub, CKA_VERIFY_RECOVER, &false_val,
1345 sizeof(false_val));
1346 FILL_ATTR(tpub, npub, CKA_WRAP, &false_val, sizeof(false_val));
1347 FILL_ATTR(tpub, npub, CKA_DERIVE, &false_val, sizeof(false_val));
1348 FILL_ATTR(tpub, npub, CKA_MODULUS_BITS, &bits, sizeof(bits));
1349 FILL_ATTR(tpub, npub, CKA_PUBLIC_EXPONENT, pubExponent,
1350 sizeof(pubExponent));
1351 FILL_ATTR(tpub, npub, CKA_ID, &keyid, sizeof(keyid));
1352
1353 FILL_ATTR(tpriv, npriv, CKA_TOKEN, &true_val, sizeof(true_val));
1354 FILL_ATTR(tpriv, npriv, CKA_LABEL, plabel, strlen(plabel));
1355 FILL_ATTR(tpriv, npriv, CKA_PRIVATE, &true_val, sizeof(true_val));
1356 FILL_ATTR(tpriv, npriv, CKA_SENSITIVE, &true_val, sizeof(true_val));
1357 FILL_ATTR(tpriv, npriv, CKA_DECRYPT, &false_val, sizeof(false_val));
1358 FILL_ATTR(tpriv, npriv, CKA_SIGN, &true_val, sizeof(true_val));
1359 FILL_ATTR(tpriv, npriv, CKA_SIGN_RECOVER, &false_val,
1360 sizeof(false_val));
1361 FILL_ATTR(tpriv, npriv, CKA_UNWRAP, &false_val, sizeof(false_val));
1362 FILL_ATTR(tpriv, npriv, CKA_DERIVE, &false_val, sizeof(false_val));
1363 FILL_ATTR(tpriv, npriv, CKA_ID, &keyid, sizeof(keyid));
1364
1365 f = p->function_list;
1366 si = &p->slotinfo[slotidx];
1367 session = si->session;
1368
1369 if ((rv = f->C_GenerateKeyPair(session, &mech, tpub, npub, tpriv, npriv,
1370 &pubKey, &privKey)) != CKR_OK) {
1371 error_f("key generation failed: error 0x%lx", rv);
1372 *err = rv;
1373 return NULL;
1374 }
1375
1376 return pkcs11_fetch_rsa_pubkey(p, slotidx, &pubKey);
1377 }
1378
1379 static int
h2i(char c)1380 h2i(char c)
1381 {
1382 if (c >= '0' && c <= '9')
1383 return c - '0';
1384 else if (c >= 'a' && c <= 'f')
1385 return c - 'a' + 10;
1386 else if (c >= 'A' && c <= 'F')
1387 return c - 'A' + 10;
1388 else
1389 return -1;
1390 }
1391
1392 static int
pkcs11_decode_hex(const char * hex,unsigned char ** dest,size_t * rlen)1393 pkcs11_decode_hex(const char *hex, unsigned char **dest, size_t *rlen)
1394 {
1395 size_t i, len;
1396
1397 if (dest)
1398 *dest = NULL;
1399 if (rlen)
1400 *rlen = 0;
1401
1402 if ((len = strlen(hex)) % 2)
1403 return -1;
1404 len /= 2;
1405
1406 *dest = xmalloc(len);
1407
1408 for (i = 0; i < len; i++) {
1409 int hi, low;
1410
1411 hi = h2i(hex[2 * i]);
1412 lo = h2i(hex[(2 * i) + 1]);
1413 if (hi == -1 || lo == -1)
1414 return -1;
1415 (*dest)[i] = (hi << 4) | lo;
1416 }
1417
1418 if (rlen)
1419 *rlen = len;
1420
1421 return 0;
1422 }
1423
1424 static struct ec_curve_info {
1425 const char *name;
1426 const char *oid;
1427 const char *oid_encoded;
1428 size_t size;
1429 } ec_curve_infos[] = {
1430 {"prime256v1", "1.2.840.10045.3.1.7", "06082A8648CE3D030107", 256},
1431 {"secp384r1", "1.3.132.0.34", "06052B81040022", 384},
1432 {"secp521r1", "1.3.132.0.35", "06052B81040023", 521},
1433 {NULL, NULL, NULL, 0},
1434 };
1435
1436 static struct sshkey *
pkcs11_ecdsa_generate_private_key(struct pkcs11_provider * p,CK_ULONG slotidx,char * label,CK_ULONG bits,CK_BYTE keyid,u_int32_t * err)1437 pkcs11_ecdsa_generate_private_key(struct pkcs11_provider *p, CK_ULONG slotidx,
1438 char *label, CK_ULONG bits, CK_BYTE keyid, u_int32_t *err)
1439 {
1440 struct pkcs11_slotinfo *si;
1441 char *plabel = label ? label : "";
1442 int i;
1443 size_t ecparams_size;
1444 unsigned char *ecparams = NULL;
1445 int npub = 0, npriv = 0;
1446 CK_RV rv;
1447 CK_FUNCTION_LIST *f;
1448 CK_SESSION_HANDLE session;
1449 CK_BBOOL true_val = CK_TRUE, false_val = CK_FALSE;
1450 CK_OBJECT_HANDLE pubKey, privKey;
1451 CK_MECHANISM mech = {
1452 CKM_EC_KEY_PAIR_GEN, NULL_PTR, 0
1453 };
1454 CK_ATTRIBUTE tpub[16], tpriv[16];
1455
1456 *err = 0;
1457
1458 for (i = 0; ec_curve_infos[i].name; i++) {
1459 if (ec_curve_infos[i].size == bits)
1460 break;
1461 }
1462 if (!ec_curve_infos[i].name) {
1463 error_f("invalid key size %lu", bits);
1464 return NULL;
1465 }
1466 if (pkcs11_decode_hex(ec_curve_infos[i].oid_encoded, &ecparams,
1467 &ecparams_size) == -1) {
1468 error_f("invalid oid");
1469 return NULL;
1470 }
1471
1472 FILL_ATTR(tpub, npub, CKA_TOKEN, &true_val, sizeof(true_val));
1473 FILL_ATTR(tpub, npub, CKA_LABEL, plabel, strlen(plabel));
1474 FILL_ATTR(tpub, npub, CKA_ENCRYPT, &false_val, sizeof(false_val));
1475 FILL_ATTR(tpub, npub, CKA_VERIFY, &true_val, sizeof(true_val));
1476 FILL_ATTR(tpub, npub, CKA_VERIFY_RECOVER, &false_val,
1477 sizeof(false_val));
1478 FILL_ATTR(tpub, npub, CKA_WRAP, &false_val, sizeof(false_val));
1479 FILL_ATTR(tpub, npub, CKA_DERIVE, &false_val, sizeof(false_val));
1480 FILL_ATTR(tpub, npub, CKA_EC_PARAMS, ecparams, ecparams_size);
1481 FILL_ATTR(tpub, npub, CKA_ID, &keyid, sizeof(keyid));
1482
1483 FILL_ATTR(tpriv, npriv, CKA_TOKEN, &true_val, sizeof(true_val));
1484 FILL_ATTR(tpriv, npriv, CKA_LABEL, plabel, strlen(plabel));
1485 FILL_ATTR(tpriv, npriv, CKA_PRIVATE, &true_val, sizeof(true_val));
1486 FILL_ATTR(tpriv, npriv, CKA_SENSITIVE, &true_val, sizeof(true_val));
1487 FILL_ATTR(tpriv, npriv, CKA_DECRYPT, &false_val, sizeof(false_val));
1488 FILL_ATTR(tpriv, npriv, CKA_SIGN, &true_val, sizeof(true_val));
1489 FILL_ATTR(tpriv, npriv, CKA_SIGN_RECOVER, &false_val,
1490 sizeof(false_val));
1491 FILL_ATTR(tpriv, npriv, CKA_UNWRAP, &false_val, sizeof(false_val));
1492 FILL_ATTR(tpriv, npriv, CKA_DERIVE, &false_val, sizeof(false_val));
1493 FILL_ATTR(tpriv, npriv, CKA_ID, &keyid, sizeof(keyid));
1494
1495 f = p->function_list;
1496 si = &p->slotinfo[slotidx];
1497 session = si->session;
1498
1499 if ((rv = f->C_GenerateKeyPair(session, &mech, tpub, npub, tpriv, npriv,
1500 &pubKey, &privKey)) != CKR_OK) {
1501 error_f("key generation failed: error 0x%lx", rv);
1502 *err = rv;
1503 return NULL;
1504 }
1505
1506 return pkcs11_fetch_ecdsa_pubkey(p, slotidx, &pubKey);
1507 }
1508 #endif /* WITH_PKCS11_KEYGEN */
1509
1510 /*
1511 * register a new provider, fails if provider already exists. if
1512 * keyp is provided, fetch keys.
1513 */
1514 static int
pkcs11_register_provider(char * provider_id,char * pin,struct sshkey *** keyp,char *** labelsp,struct pkcs11_provider ** providerp,CK_ULONG user)1515 pkcs11_register_provider(char *provider_id, char *pin,
1516 struct sshkey ***keyp, char ***labelsp,
1517 struct pkcs11_provider **providerp, CK_ULONG user)
1518 {
1519 int nkeys, need_finalize = 0;
1520 int ret = -1;
1521 struct pkcs11_provider *p = NULL;
1522 void *handle = NULL;
1523 CK_RV (*getfunctionlist)(CK_FUNCTION_LIST **);
1524 CK_RV rv;
1525 CK_FUNCTION_LIST *f = NULL;
1526 CK_TOKEN_INFO *token;
1527 CK_ULONG i;
1528
1529 if (providerp == NULL)
1530 goto fail;
1531 *providerp = NULL;
1532
1533 if (keyp != NULL)
1534 *keyp = NULL;
1535 if (labelsp != NULL)
1536 *labelsp = NULL;
1537
1538 if (pkcs11_provider_lookup(provider_id) != NULL) {
1539 debug_f("provider already registered: %s", provider_id);
1540 goto fail;
1541 }
1542 if (lib_contains_symbol(provider_id, "C_GetFunctionList") != 0) {
1543 error("provider %s is not a PKCS11 library", provider_id);
1544 goto fail;
1545 }
1546 /* open shared pkcs11-library */
1547 if ((handle = dlopen(provider_id, RTLD_NOW)) == NULL) {
1548 error("dlopen %s failed: %s", provider_id, dlerror());
1549 goto fail;
1550 }
1551 if ((getfunctionlist = dlsym(handle, "C_GetFunctionList")) == NULL)
1552 fatal("dlsym(C_GetFunctionList) failed: %s", dlerror());
1553 p = xcalloc(1, sizeof(*p));
1554 p->name = xstrdup(provider_id);
1555 p->handle = handle;
1556 /* setup the pkcs11 callbacks */
1557 if ((rv = (*getfunctionlist)(&f)) != CKR_OK) {
1558 error("C_GetFunctionList for provider %s failed: %lu",
1559 provider_id, rv);
1560 goto fail;
1561 }
1562 p->function_list = f;
1563 if ((rv = f->C_Initialize(NULL)) != CKR_OK) {
1564 error("C_Initialize for provider %s failed: %lu",
1565 provider_id, rv);
1566 goto fail;
1567 }
1568 need_finalize = 1;
1569 if ((rv = f->C_GetInfo(&p->info)) != CKR_OK) {
1570 error("C_GetInfo for provider %s failed: %lu",
1571 provider_id, rv);
1572 goto fail;
1573 }
1574 debug("provider %s: manufacturerID <%.*s> cryptokiVersion %d.%d"
1575 " libraryDescription <%.*s> libraryVersion %d.%d",
1576 provider_id,
1577 RMSPACE(p->info.manufacturerID),
1578 p->info.cryptokiVersion.major,
1579 p->info.cryptokiVersion.minor,
1580 RMSPACE(p->info.libraryDescription),
1581 p->info.libraryVersion.major,
1582 p->info.libraryVersion.minor);
1583 if ((rv = f->C_GetSlotList(CK_TRUE, NULL, &p->nslots)) != CKR_OK) {
1584 error("C_GetSlotList failed: %lu", rv);
1585 goto fail;
1586 }
1587 if (p->nslots == 0) {
1588 debug_f("provider %s returned no slots", provider_id);
1589 ret = -SSH_PKCS11_ERR_NO_SLOTS;
1590 goto fail;
1591 }
1592 p->slotlist = xcalloc(p->nslots, sizeof(CK_SLOT_ID));
1593 if ((rv = f->C_GetSlotList(CK_TRUE, p->slotlist, &p->nslots))
1594 != CKR_OK) {
1595 error("C_GetSlotList for provider %s failed: %lu",
1596 provider_id, rv);
1597 goto fail;
1598 }
1599 p->slotinfo = xcalloc(p->nslots, sizeof(struct pkcs11_slotinfo));
1600 p->valid = 1;
1601 nkeys = 0;
1602 for (i = 0; i < p->nslots; i++) {
1603 token = &p->slotinfo[i].token;
1604 if ((rv = f->C_GetTokenInfo(p->slotlist[i], token))
1605 != CKR_OK) {
1606 error("C_GetTokenInfo for provider %s slot %lu "
1607 "failed: %lu", provider_id, (u_long)i, rv);
1608 continue;
1609 }
1610 if ((token->flags & CKF_TOKEN_INITIALIZED) == 0) {
1611 debug2_f("ignoring uninitialised token in "
1612 "provider %s slot %lu", provider_id, (u_long)i);
1613 continue;
1614 }
1615 debug("provider %s slot %lu: label <%.*s> "
1616 "manufacturerID <%.*s> model <%.*s> serial <%.*s> "
1617 "flags 0x%lx",
1618 provider_id, (unsigned long)i,
1619 RMSPACE(token->label), RMSPACE(token->manufacturerID),
1620 RMSPACE(token->model), RMSPACE(token->serialNumber),
1621 token->flags);
1622 /*
1623 * open session, login with pin and retrieve public
1624 * keys (if keyp is provided)
1625 */
1626 if ((ret = pkcs11_open_session(p, i, pin, user)) != 0 ||
1627 keyp == NULL)
1628 continue;
1629 pkcs11_fetch_keys(p, i, keyp, labelsp, &nkeys);
1630 pkcs11_fetch_certs(p, i, keyp, labelsp, &nkeys);
1631 if (nkeys == 0 && !p->slotinfo[i].logged_in &&
1632 pkcs11_interactive) {
1633 /*
1634 * Some tokens require login before they will
1635 * expose keys.
1636 */
1637 if (pkcs11_login_slot(p, &p->slotinfo[i],
1638 CKU_USER) < 0) {
1639 error("login failed");
1640 continue;
1641 }
1642 pkcs11_fetch_keys(p, i, keyp, labelsp, &nkeys);
1643 pkcs11_fetch_certs(p, i, keyp, labelsp, &nkeys);
1644 }
1645 }
1646
1647 /* now owned by caller */
1648 *providerp = p;
1649
1650 TAILQ_INSERT_TAIL(&pkcs11_providers, p, next);
1651 p->refcount++; /* add to provider list */
1652
1653 return (nkeys);
1654 fail:
1655 if (need_finalize && (rv = f->C_Finalize(NULL)) != CKR_OK)
1656 error("C_Finalize for provider %s failed: %lu",
1657 provider_id, rv);
1658 if (p) {
1659 free(p->name);
1660 free(p->slotlist);
1661 free(p->slotinfo);
1662 free(p);
1663 }
1664 if (handle)
1665 dlclose(handle);
1666 if (ret > 0)
1667 ret = -1;
1668 return (ret);
1669 }
1670
1671 /*
1672 * register a new provider and get number of keys hold by the token,
1673 * fails if provider already exists
1674 */
1675 int
pkcs11_add_provider(char * provider_id,char * pin,struct sshkey *** keyp,char *** labelsp)1676 pkcs11_add_provider(char *provider_id, char *pin, struct sshkey ***keyp,
1677 char ***labelsp)
1678 {
1679 struct pkcs11_provider *p = NULL;
1680 int nkeys;
1681
1682 nkeys = pkcs11_register_provider(provider_id, pin, keyp, labelsp,
1683 &p, CKU_USER);
1684
1685 /* no keys found or some other error, de-register provider */
1686 if (nkeys <= 0 && p != NULL) {
1687 TAILQ_REMOVE(&pkcs11_providers, p, next);
1688 pkcs11_provider_finalize(p);
1689 pkcs11_provider_unref(p);
1690 }
1691 if (nkeys == 0)
1692 debug_f("provider %s returned no keys", provider_id);
1693
1694 return (nkeys);
1695 }
1696
1697 #ifdef WITH_PKCS11_KEYGEN
1698 struct sshkey *
pkcs11_gakp(char * provider_id,char * pin,unsigned int slotidx,char * label,unsigned int type,unsigned int bits,unsigned char keyid,u_int32_t * err)1699 pkcs11_gakp(char *provider_id, char *pin, unsigned int slotidx, char *label,
1700 unsigned int type, unsigned int bits, unsigned char keyid, u_int32_t *err)
1701 {
1702 struct pkcs11_provider *p = NULL;
1703 struct pkcs11_slotinfo *si;
1704 CK_FUNCTION_LIST *f;
1705 CK_SESSION_HANDLE session;
1706 struct sshkey *k = NULL;
1707 int ret = -1, reset_pin = 0, reset_provider = 0;
1708 CK_RV rv;
1709
1710 *err = 0;
1711
1712 if ((p = pkcs11_provider_lookup(provider_id)) != NULL)
1713 debug_f("provider \"%s\" available", provider_id);
1714 else if ((ret = pkcs11_register_provider(provider_id, pin, NULL, NULL,
1715 &p, CKU_SO)) < 0) {
1716 debug_f("could not register provider %s", provider_id);
1717 goto out;
1718 } else
1719 reset_provider = 1;
1720
1721 f = p->function_list;
1722 si = &p->slotinfo[slotidx];
1723 session = si->session;
1724
1725 if ((rv = f->C_SetOperationState(session , pin, strlen(pin),
1726 CK_INVALID_HANDLE, CK_INVALID_HANDLE)) != CKR_OK) {
1727 debug_f("could not supply SO pin: %lu", rv);
1728 reset_pin = 0;
1729 } else
1730 reset_pin = 1;
1731
1732 switch (type) {
1733 case KEY_RSA:
1734 if ((k = pkcs11_rsa_generate_private_key(p, slotidx, label,
1735 bits, keyid, err)) == NULL) {
1736 debug_f("failed to generate RSA key");
1737 goto out;
1738 }
1739 break;
1740 case KEY_ECDSA:
1741 if ((k = pkcs11_ecdsa_generate_private_key(p, slotidx, label,
1742 bits, keyid, err)) == NULL) {
1743 debug_f("failed to generate ECDSA key");
1744 goto out;
1745 }
1746 break;
1747 default:
1748 *err = SSH_PKCS11_ERR_GENERIC;
1749 debug_f("unknown type %d", type);
1750 goto out;
1751 }
1752
1753 out:
1754 if (reset_pin)
1755 f->C_SetOperationState(session , NULL, 0, CK_INVALID_HANDLE,
1756 CK_INVALID_HANDLE);
1757
1758 if (reset_provider)
1759 pkcs11_del_provider(provider_id);
1760
1761 return (k);
1762 }
1763
1764 struct sshkey *
pkcs11_destroy_keypair(char * provider_id,char * pin,unsigned long slotidx,unsigned char keyid,u_int32_t * err)1765 pkcs11_destroy_keypair(char *provider_id, char *pin, unsigned long slotidx,
1766 unsigned char keyid, u_int32_t *err)
1767 {
1768 struct pkcs11_provider *p = NULL;
1769 struct pkcs11_slotinfo *si;
1770 struct sshkey *k = NULL;
1771 int reset_pin = 0, reset_provider = 0;
1772 CK_ULONG nattrs;
1773 CK_FUNCTION_LIST *f;
1774 CK_SESSION_HANDLE session;
1775 CK_ATTRIBUTE attrs[16];
1776 CK_OBJECT_CLASS key_class;
1777 CK_KEY_TYPE key_type;
1778 CK_OBJECT_HANDLE obj = CK_INVALID_HANDLE;
1779 CK_RV rv;
1780
1781 *err = 0;
1782
1783 if ((p = pkcs11_provider_lookup(provider_id)) != NULL) {
1784 debug_f("using provider \"%s\"", provider_id);
1785 } else if (pkcs11_register_provider(provider_id, pin, NULL, NULL, &p,
1786 CKU_SO) < 0) {
1787 debug_f("could not register provider %s",
1788 provider_id);
1789 goto out;
1790 } else
1791 reset_provider = 1;
1792
1793 f = p->function_list;
1794 si = &p->slotinfo[slotidx];
1795 session = si->session;
1796
1797 if ((rv = f->C_SetOperationState(session , pin, strlen(pin),
1798 CK_INVALID_HANDLE, CK_INVALID_HANDLE)) != CKR_OK) {
1799 debug_f("could not supply SO pin: %lu", rv);
1800 reset_pin = 0;
1801 } else
1802 reset_pin = 1;
1803
1804 /* private key */
1805 nattrs = 0;
1806 key_class = CKO_PRIVATE_KEY;
1807 FILL_ATTR(attrs, nattrs, CKA_CLASS, &key_class, sizeof(key_class));
1808 FILL_ATTR(attrs, nattrs, CKA_ID, &keyid, sizeof(keyid));
1809
1810 if (pkcs11_find(p, slotidx, attrs, nattrs, &obj) == 0 &&
1811 obj != CK_INVALID_HANDLE) {
1812 if ((rv = f->C_DestroyObject(session, obj)) != CKR_OK) {
1813 debug_f("could not destroy private key 0x%hhx",
1814 keyid);
1815 *err = rv;
1816 goto out;
1817 }
1818 }
1819
1820 /* public key */
1821 nattrs = 0;
1822 key_class = CKO_PUBLIC_KEY;
1823 FILL_ATTR(attrs, nattrs, CKA_CLASS, &key_class, sizeof(key_class));
1824 FILL_ATTR(attrs, nattrs, CKA_ID, &keyid, sizeof(keyid));
1825
1826 if (pkcs11_find(p, slotidx, attrs, nattrs, &obj) == 0 &&
1827 obj != CK_INVALID_HANDLE) {
1828
1829 /* get key type */
1830 nattrs = 0;
1831 FILL_ATTR(attrs, nattrs, CKA_KEY_TYPE, &key_type,
1832 sizeof(key_type));
1833 rv = f->C_GetAttributeValue(session, obj, attrs, nattrs);
1834 if (rv != CKR_OK) {
1835 debug_f("could not get key type of public key 0x%hhx",
1836 keyid);
1837 *err = rv;
1838 key_type = -1;
1839 }
1840 if (key_type == CKK_RSA)
1841 k = pkcs11_fetch_rsa_pubkey(p, slotidx, &obj);
1842 else if (key_type == CKK_ECDSA)
1843 k = pkcs11_fetch_ecdsa_pubkey(p, slotidx, &obj);
1844
1845 if ((rv = f->C_DestroyObject(session, obj)) != CKR_OK) {
1846 debug_f("could not destroy public key 0x%hhx", keyid);
1847 *err = rv;
1848 goto out;
1849 }
1850 }
1851
1852 out:
1853 if (reset_pin)
1854 f->C_SetOperationState(session , NULL, 0, CK_INVALID_HANDLE,
1855 CK_INVALID_HANDLE);
1856
1857 if (reset_provider)
1858 pkcs11_del_provider(provider_id);
1859
1860 return (k);
1861 }
1862 #endif /* WITH_PKCS11_KEYGEN */
1863 #else
1864 int
pkcs11_add_provider(char * provider_id,char * pin,struct sshkey *** keyp,char *** labelsp)1865 pkcs11_add_provider(char *provider_id, char *pin, struct sshkey ***keyp,
1866 char ***labelsp)
1867 {
1868 error("dlopen() not supported");
1869 return (-1);
1870 }
1871 #endif /* HAVE_DLOPEN */
1872