crypto/openssh/ssh-pkcs11.c

   1 /* $OpenBSD: ssh-pkcs11.c,v 1.6 2010/06/08 21:32:19 markus Exp $ */
   2 /*
   3  * Copyright (c) 2010 Markus Friedl.  All rights reserved.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "includes.h"
  19
  20 #ifdef ENABLE_PKCS11
  21
  22 #include <sys/types.h>
  23 #ifdef HAVE_SYS_TIME_H
  24 # include <sys/time.h>
  25 #endif
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28
  29 #include <string.h>
  30 #include <dlfcn.h>
  31
  32 #include "openbsd-compat/sys-queue.h"
  33
  34 #define CRYPTOKI_COMPAT
  35 #include "pkcs11.h"
  36
  37 #include "log.h"
  38 #include "misc.h"
  39 #include "key.h"
  40 #include "ssh-pkcs11.h"
  41 #include "xmalloc.h"
  42
  43 struct pkcs11_slotinfo {
  44         CK_TOKEN_INFO           token;
  45         CK_SESSION_HANDLE       session;
  46         int                     logged_in;
  47 };
  48
  49 struct pkcs11_provider {
  50         char                    *name;
  51         void                    *handle;
  52         CK_FUNCTION_LIST        *function_list;
  53         CK_INFO                 info;
  54         CK_ULONG                nslots;
  55         CK_SLOT_ID              *slotlist;
  56         struct pkcs11_slotinfo  *slotinfo;
  57         int                     valid;
  58         int                     refcount;
  59         TAILQ_ENTRY(pkcs11_provider) next;
  60 };
  61
  62 TAILQ_HEAD(, pkcs11_provider) pkcs11_providers;
  63
  64 struct pkcs11_key {
  65         struct pkcs11_provider  *provider;
  66         CK_ULONG                slotidx;
  67         int                     (*orig_finish)(RSA *rsa);
  68         RSA_METHOD              rsa_method;
  69         char                    *keyid;
  70         int                     keyid_len;
  71 };
  72
  73 int pkcs11_interactive = 0;
  74
  75 int
  76 pkcs11_init(int interactive)
  77 {
  78         pkcs11_interactive = interactive;
  79         TAILQ_INIT(&pkcs11_providers);
  80         return (0);
  81 }
  82
  83 /*
  84  * finalize a provider shared libarary, it's no longer usable.
  85  * however, there might still be keys referencing this provider,
  86  * so the actuall freeing of memory is handled by pkcs11_provider_unref().
  87  * this is called when a provider gets unregistered.
  88  */
  89 static void
  90 pkcs11_provider_finalize(struct pkcs11_provider *p)
  91 {
  92         CK_RV rv;
  93         CK_ULONG i;
  94
  95         debug("pkcs11_provider_finalize: %p refcount %d valid %d",
  96             p, p->refcount, p->valid);
  97         if (!p->valid)
  98                 return;
  99         for (i = 0; i < p->nslots; i++) {
 100                 if (p->slotinfo[i].session &&
 101                     (rv = p->function_list->C_CloseSession(
 102                     p->slotinfo[i].session)) != CKR_OK)
 103                         error("C_CloseSession failed: %lu", rv);
 104         }
 105         if ((rv = p->function_list->C_Finalize(NULL)) != CKR_OK)
 106                 error("C_Finalize failed: %lu", rv);
 107         p->valid = 0;
 108         p->function_list = NULL;
 109         dlclose(p->handle);
 110 }
 111
 112 /*
 113  * remove a reference to the provider.
 114  * called when a key gets destroyed or when the provider is unregistered.
 115  */
 116 static void
 117 pkcs11_provider_unref(struct pkcs11_provider *p)
 118 {
 119         debug("pkcs11_provider_unref: %p refcount %d", p, p->refcount);
 120         if (--p->refcount <= 0) {
 121                 if (p->valid)
 122                         error("pkcs11_provider_unref: %p still valid", p);
 123                 xfree(p->slotlist);
 124                 xfree(p->slotinfo);
 125                 xfree(p);
 126         }
 127 }
 128
 129 /* unregister all providers, keys might still point to the providers */
 130 void
 131 pkcs11_terminate(void)
 132 {
 133         struct pkcs11_provider *p;
 134
 135         while ((p = TAILQ_FIRST(&pkcs11_providers)) != NULL) {
 136                 TAILQ_REMOVE(&pkcs11_providers, p, next);
 137                 pkcs11_provider_finalize(p);
 138                 pkcs11_provider_unref(p);
 139         }
 140 }
 141
 142 /* lookup provider by name */
 143 static struct pkcs11_provider *
 144 pkcs11_provider_lookup(char *provider_id)
 145 {
 146         struct pkcs11_provider *p;
 147
 148         TAILQ_FOREACH(p, &pkcs11_providers, next) {
 149                 debug("check %p %s", p, p->name);
 150                 if (!strcmp(provider_id, p->name))
 151                         return (p);
 152         }
 153         return (NULL);
 154 }
 155
 156 /* unregister provider by name */
 157 int
 158 pkcs11_del_provider(char *provider_id)
 159 {
 160         struct pkcs11_provider *p;
 161
 162         if ((p = pkcs11_provider_lookup(provider_id)) != NULL) {
 163                 TAILQ_REMOVE(&pkcs11_providers, p, next);
 164                 pkcs11_provider_finalize(p);
 165                 pkcs11_provider_unref(p);
 166                 return (0);
 167         }
 168         return (-1);
 169 }
 170
 171 /* openssl callback for freeing an RSA key */
 172 static int
 173 pkcs11_rsa_finish(RSA *rsa)
 174 {
 175         struct pkcs11_key       *k11;
 176         int rv = -1;
 177
 178         if ((k11 = RSA_get_app_data(rsa)) != NULL) {
 179                 if (k11->orig_finish)
 180                         rv = k11->orig_finish(rsa);
 181                 if (k11->provider)
 182                         pkcs11_provider_unref(k11->provider);
 183                 if (k11->keyid)
 184                         xfree(k11->keyid);
 185                 xfree(k11);
 186         }
 187         return (rv);
 188 }
 189
 190 /* find a single 'obj' for given attributes */
 191 static int
 192 pkcs11_find(struct pkcs11_provider *p, CK_ULONG slotidx, CK_ATTRIBUTE *attr,
 193     CK_ULONG nattr, CK_OBJECT_HANDLE *obj)
 194 {
 195         CK_FUNCTION_LIST        *f;
 196         CK_SESSION_HANDLE       session;
 197         CK_ULONG                nfound = 0;
 198         CK_RV                   rv;
 199         int                     ret = -1;
 200
 201         f = p->function_list;
 202         session = p->slotinfo[slotidx].session;
 203         if ((rv = f->C_FindObjectsInit(session, attr, nattr)) != CKR_OK) {
 204                 error("C_FindObjectsInit failed (nattr %lu): %lu", nattr, rv);
 205                 return (-1);
 206         }
 207         if ((rv = f->C_FindObjects(session, obj, 1, &nfound)) != CKR_OK ||
 208             nfound != 1) {
 209                 debug("C_FindObjects failed (nfound %lu nattr %lu): %lu",
 210                     nfound, nattr, rv);
 211         } else
 212                 ret = 0;
 213         if ((rv = f->C_FindObjectsFinal(session)) != CKR_OK)
 214                 error("C_FindObjectsFinal failed: %lu", rv);
 215         return (ret);
 216 }
 217
 218 /* openssl callback doing the actual signing operation */
 219 static int
 220 pkcs11_rsa_private_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
 221     int padding)
 222 {
 223         struct pkcs11_key       *k11;
 224         struct pkcs11_slotinfo  *si;
 225         CK_FUNCTION_LIST        *f;
 226         CK_OBJECT_HANDLE        obj;
 227         CK_ULONG                tlen = 0;
 228         CK_RV                   rv;
 229         CK_OBJECT_CLASS         private_key_class = CKO_PRIVATE_KEY;
 230         CK_BBOOL                true_val = CK_TRUE;
 231         CK_MECHANISM            mech = {
 232                 CKM_RSA_PKCS, NULL_PTR, 0
 233         };
 234         CK_ATTRIBUTE            key_filter[] = {
 235                 {CKA_CLASS, NULL, sizeof(private_key_class) },
 236                 {CKA_ID, NULL, 0},
 237                 {CKA_SIGN, NULL, sizeof(true_val) }
 238         };
 239         char                    *pin, prompt[1024];
 240         int                     rval = -1;
 241
 242         /* some compilers complain about non-constant initializer so we
 243            use NULL in CK_ATTRIBUTE above and set the values here */
 244         key_filter[0].pValue = &private_key_class;
 245         key_filter[2].pValue = &true_val;
 246
 247         if ((k11 = RSA_get_app_data(rsa)) == NULL) {
 248                 error("RSA_get_app_data failed for rsa %p", rsa);
 249                 return (-1);
 250         }
 251         if (!k11->provider || !k11->provider->valid) {
 252                 error("no pkcs11 (valid) provider for rsa %p", rsa);
 253                 return (-1);
 254         }
 255         f = k11->provider->function_list;
 256         si = &k11->provider->slotinfo[k11->slotidx];
 257         if ((si->token.flags & CKF_LOGIN_REQUIRED) && !si->logged_in) {
 258                 if (!pkcs11_interactive) {
 259                         error("need pin");
 260                         return (-1);
 261                 }
 262                 snprintf(prompt, sizeof(prompt), "Enter PIN for '%s': ",
 263                     si->token.label);
 264                 pin = read_passphrase(prompt, RP_ALLOW_EOF);
 265                 if (pin == NULL)
 266                         return (-1);    /* bail out */
 267                 if ((rv = f->C_Login(si->session, CKU_USER, pin, strlen(pin)))
 268                     != CKR_OK) {
 269                         xfree(pin);
 270                         error("C_Login failed: %lu", rv);
 271                         return (-1);
 272                 }
 273                 xfree(pin);
 274                 si->logged_in = 1;
 275         }
 276         key_filter[1].pValue = k11->keyid;
 277         key_filter[1].ulValueLen = k11->keyid_len;
 278         /* try to find object w/CKA_SIGN first, retry w/o */
 279         if (pkcs11_find(k11->provider, k11->slotidx, key_filter, 3, &obj) < 0 &&
 280             pkcs11_find(k11->provider, k11->slotidx, key_filter, 2, &obj) < 0) {
 281                 error("cannot find private key");
 282         } else if ((rv = f->C_SignInit(si->session, &mech, obj)) != CKR_OK) {
 283                 error("C_SignInit failed: %lu", rv);
 284         } else {
 285                 /* XXX handle CKR_BUFFER_TOO_SMALL */
 286                 tlen = RSA_size(rsa);
 287                 rv = f->C_Sign(si->session, (CK_BYTE *)from, flen, to, &tlen);
 288                 if (rv == CKR_OK)
 289                         rval = tlen;
 290                 else
 291                         error("C_Sign failed: %lu", rv);
 292         }
 293         return (rval);
 294 }
 295
 296 static int
 297 pkcs11_rsa_private_decrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
 298     int padding)
 299 {
 300         return (-1);
 301 }
 302
 303 /* redirect private key operations for rsa key to pkcs11 token */
 304 static int
 305 pkcs11_rsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
 306     CK_ATTRIBUTE *keyid_attrib, RSA *rsa)
 307 {
 308         struct pkcs11_key       *k11;
 309         const RSA_METHOD        *def = RSA_get_default_method();
 310
 311         k11 = xcalloc(1, sizeof(*k11));
 312         k11->provider = provider;
 313         provider->refcount++;   /* provider referenced by RSA key */
 314         k11->slotidx = slotidx;
 315         /* identify key object on smartcard */
 316         k11->keyid_len = keyid_attrib->ulValueLen;
 317         k11->keyid = xmalloc(k11->keyid_len);
 318         memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
 319         k11->orig_finish = def->finish;
 320         memcpy(&k11->rsa_method, def, sizeof(k11->rsa_method));
 321         k11->rsa_method.name = "pkcs11";
 322         k11->rsa_method.rsa_priv_enc = pkcs11_rsa_private_encrypt;
 323         k11->rsa_method.rsa_priv_dec = pkcs11_rsa_private_decrypt;
 324         k11->rsa_method.finish = pkcs11_rsa_finish;
 325         RSA_set_method(rsa, &k11->rsa_method);
 326         RSA_set_app_data(rsa, k11);
 327         return (0);
 328 }
 329
 330 /* remove trailing spaces */
 331 static void
 332 rmspace(char *buf, size_t len)
 333 {
 334         size_t i;
 335
 336         if (!len)
 337                 return;
 338         for (i = len - 1;  i > 0; i--)
 339                 if (i == len - 1 || buf[i] == ' ')
 340                         buf[i] = '\0';
 341                 else
 342                         break;
 343 }
 344
 345 /*
 346  * open a pkcs11 session and login if required.
 347  * if pin == NULL we delay login until key use
 348  */
 349 static int
 350 pkcs11_open_session(struct pkcs11_provider *p, CK_ULONG slotidx, char *pin)
 351 {
 352         CK_RV                   rv;
 353         CK_FUNCTION_LIST        *f;
 354         CK_SESSION_HANDLE       session;
 355         int                     login_required;
 356
 357         f = p->function_list;
 358         login_required = p->slotinfo[slotidx].token.flags & CKF_LOGIN_REQUIRED;
 359         if (pin && login_required && !strlen(pin)) {
 360                 error("pin required");
 361                 return (-1);
 362         }
 363         if ((rv = f->C_OpenSession(p->slotlist[slotidx], CKF_RW_SESSION|
 364             CKF_SERIAL_SESSION, NULL, NULL, &session))
 365             != CKR_OK) {
 366                 error("C_OpenSession failed: %lu", rv);
 367                 return (-1);
 368         }
 369         if (login_required && pin) {
 370                 if ((rv = f->C_Login(session, CKU_USER, pin, strlen(pin)))
 371                     != CKR_OK) {
 372                         error("C_Login failed: %lu", rv);
 373                         if ((rv = f->C_CloseSession(session)) != CKR_OK)
 374                                 error("C_CloseSession failed: %lu", rv);
 375                         return (-1);
 376                 }
 377                 p->slotinfo[slotidx].logged_in = 1;
 378         }
 379         p->slotinfo[slotidx].session = session;
 380         return (0);
 381 }
 382
 383 /*
 384  * lookup public keys for token in slot identified by slotidx,
 385  * add 'wrapped' public keys to the 'keysp' array and increment nkeys.
 386  * keysp points to an (possibly empty) array with *nkeys keys.
 387  */
 388 static int
 389 pkcs11_fetch_keys(struct pkcs11_provider *p, CK_ULONG slotidx, Key ***keysp,
 390     int *nkeys)
 391 {
 392         Key                     *key;
 393         RSA                     *rsa;
 394         int                     i;
 395         CK_RV                   rv;
 396         CK_OBJECT_HANDLE        obj;
 397         CK_ULONG                nfound;
 398         CK_SESSION_HANDLE       session;
 399         CK_FUNCTION_LIST        *f;
 400         CK_OBJECT_CLASS         pubkey_class = CKO_PUBLIC_KEY;
 401         CK_ATTRIBUTE            pubkey_filter[] = {
 402                 { CKA_CLASS, NULL, sizeof(pubkey_class) }
 403         };
 404         CK_ATTRIBUTE            attribs[] = {
 405                 { CKA_ID, NULL, 0 },
 406                 { CKA_MODULUS, NULL, 0 },
 407                 { CKA_PUBLIC_EXPONENT, NULL, 0 }
 408         };
 409
 410         /* some compilers complain about non-constant initializer so we
 411            use NULL in CK_ATTRIBUTE above and set the value here */
 412         pubkey_filter[0].pValue = &pubkey_class;
 413
 414         f = p->function_list;
 415         session = p->slotinfo[slotidx].session;
 416         /* setup a filter the looks for public keys */
 417         if ((rv = f->C_FindObjectsInit(session, pubkey_filter, 1)) != CKR_OK) {
 418                 error("C_FindObjectsInit failed: %lu", rv);
 419                 return (-1);
 420         }
 421         while (1) {
 422                 /* XXX 3 attributes in attribs[] */
 423                 for (i = 0; i < 3; i++) {
 424                         attribs[i].pValue = NULL;
 425                         attribs[i].ulValueLen = 0;
 426                 }
 427                 if ((rv = f->C_FindObjects(session, &obj, 1, &nfound)) != CKR_OK
 428                     || nfound == 0)
 429                         break;
 430                 /* found a key, so figure out size of the attributes */
 431                 if ((rv = f->C_GetAttributeValue(session, obj, attribs, 3))
 432                     != CKR_OK) {
 433                         error("C_GetAttributeValue failed: %lu", rv);
 434                         continue;
 435                 }
 436                 /* check that none of the attributes are zero length */
 437                 if (attribs[0].ulValueLen == 0 ||
 438                     attribs[1].ulValueLen == 0 ||
 439                     attribs[2].ulValueLen == 0) {
 440                         continue;
 441                 }
 442                 /* allocate buffers for attributes */
 443                 for (i = 0; i < 3; i++)
 444                         attribs[i].pValue = xmalloc(attribs[i].ulValueLen);
 445                 /* retrieve ID, modulus and public exponent of RSA key */
 446                 if ((rv = f->C_GetAttributeValue(session, obj, attribs, 3))
 447                     != CKR_OK) {
 448                         error("C_GetAttributeValue failed: %lu", rv);
 449                 } else if ((rsa = RSA_new()) == NULL) {
 450                         error("RSA_new failed");
 451                 } else {
 452                         rsa->n = BN_bin2bn(attribs[1].pValue,
 453                             attribs[1].ulValueLen, NULL);
 454                         rsa->e = BN_bin2bn(attribs[2].pValue,
 455                             attribs[2].ulValueLen, NULL);
 456                         if (rsa->n && rsa->e &&
 457                             pkcs11_rsa_wrap(p, slotidx, &attribs[0], rsa) == 0) {
 458                                 key = key_new(KEY_UNSPEC);
 459                                 key->rsa = rsa;
 460                                 key->type = KEY_RSA;
 461                                 key->flags |= KEY_FLAG_EXT;
 462                                 /* expand key array and add key */
 463                                 *keysp = xrealloc(*keysp, *nkeys + 1,
 464                                     sizeof(Key *));
 465                                 (*keysp)[*nkeys] = key;
 466                                 *nkeys = *nkeys + 1;
 467                                 debug("have %d keys", *nkeys);
 468                         } else {
 469                                 RSA_free(rsa);
 470                         }
 471                 }
 472                 for (i = 0; i < 3; i++)
 473                         xfree(attribs[i].pValue);
 474         }
 475         if ((rv = f->C_FindObjectsFinal(session)) != CKR_OK)
 476                 error("C_FindObjectsFinal failed: %lu", rv);
 477         return (0);
 478 }
 479
 480 /* register a new provider, fails if provider already exists */
 481 int
 482 pkcs11_add_provider(char *provider_id, char *pin, Key ***keyp)
 483 {
 484         int nkeys, need_finalize = 0;
 485         struct pkcs11_provider *p = NULL;
 486         void *handle = NULL;
 487         CK_RV (*getfunctionlist)(CK_FUNCTION_LIST **);
 488         CK_RV rv;
 489         CK_FUNCTION_LIST *f = NULL;
 490         CK_TOKEN_INFO *token;
 491         CK_ULONG i;
 492
 493         *keyp = NULL;
 494         if (pkcs11_provider_lookup(provider_id) != NULL) {
 495                 error("provider already registered: %s", provider_id);
 496                 goto fail;
 497         }
 498         /* open shared pkcs11-libarary */
 499         if ((handle = dlopen(provider_id, RTLD_NOW)) == NULL) {
 500                 error("dlopen %s failed: %s", provider_id, dlerror());
 501                 goto fail;
 502         }
 503         if ((getfunctionlist = dlsym(handle, "C_GetFunctionList")) == NULL) {
 504                 error("dlsym(C_GetFunctionList) failed: %s", dlerror());
 505                 goto fail;
 506         }
 507         p = xcalloc(1, sizeof(*p));
 508         p->name = xstrdup(provider_id);
 509         p->handle = handle;
 510         /* setup the pkcs11 callbacks */
 511         if ((rv = (*getfunctionlist)(&f)) != CKR_OK) {
 512                 error("C_GetFunctionList failed: %lu", rv);
 513                 goto fail;
 514         }
 515         p->function_list = f;
 516         if ((rv = f->C_Initialize(NULL)) != CKR_OK) {
 517                 error("C_Initialize failed: %lu", rv);
 518                 goto fail;
 519         }
 520         need_finalize = 1;
 521         if ((rv = f->C_GetInfo(&p->info)) != CKR_OK) {
 522                 error("C_GetInfo failed: %lu", rv);
 523                 goto fail;
 524         }
 525         rmspace(p->info.manufacturerID, sizeof(p->info.manufacturerID));
 526         rmspace(p->info.libraryDescription, sizeof(p->info.libraryDescription));
 527         debug("manufacturerID <%s> cryptokiVersion %d.%d"
 528             " libraryDescription <%s> libraryVersion %d.%d",
 529             p->info.manufacturerID,
 530             p->info.cryptokiVersion.major,
 531             p->info.cryptokiVersion.minor,
 532             p->info.libraryDescription,
 533             p->info.libraryVersion.major,
 534             p->info.libraryVersion.minor);
 535         if ((rv = f->C_GetSlotList(CK_TRUE, NULL, &p->nslots)) != CKR_OK) {
 536                 error("C_GetSlotList failed: %lu", rv);
 537                 goto fail;
 538         }
 539         if (p->nslots == 0) {
 540                 error("no slots");
 541                 goto fail;
 542         }
 543         p->slotlist = xcalloc(p->nslots, sizeof(CK_SLOT_ID));
 544         if ((rv = f->C_GetSlotList(CK_TRUE, p->slotlist, &p->nslots))
 545             != CKR_OK) {
 546                 error("C_GetSlotList failed: %lu", rv);
 547                 goto fail;
 548         }
 549         p->slotinfo = xcalloc(p->nslots, sizeof(struct pkcs11_slotinfo));
 550         p->valid = 1;
 551         nkeys = 0;
 552         for (i = 0; i < p->nslots; i++) {
 553                 token = &p->slotinfo[i].token;
 554                 if ((rv = f->C_GetTokenInfo(p->slotlist[i], token))
 555                     != CKR_OK) {
 556                         error("C_GetTokenInfo failed: %lu", rv);
 557                         continue;
 558                 }
 559                 rmspace(token->label, sizeof(token->label));
 560                 rmspace(token->manufacturerID, sizeof(token->manufacturerID));
 561                 rmspace(token->model, sizeof(token->model));
 562                 rmspace(token->serialNumber, sizeof(token->serialNumber));
 563                 debug("label <%s> manufacturerID <%s> model <%s> serial <%s>"
 564                     " flags 0x%lx",
 565                     token->label, token->manufacturerID, token->model,
 566                     token->serialNumber, token->flags);
 567                 /* open session, login with pin and retrieve public keys */
 568                 if (pkcs11_open_session(p, i, pin) == 0)
 569                         pkcs11_fetch_keys(p, i, keyp, &nkeys);
 570         }
 571         if (nkeys > 0) {
 572                 TAILQ_INSERT_TAIL(&pkcs11_providers, p, next);
 573                 p->refcount++;  /* add to provider list */
 574                 return (nkeys);
 575         }
 576         error("no keys");
 577         /* don't add the provider, since it does not have any keys */
 578 fail:
 579         if (need_finalize && (rv = f->C_Finalize(NULL)) != CKR_OK)
 580                 error("C_Finalize failed: %lu", rv);
 581         if (p) {
 582                 if (p->slotlist)
 583                         xfree(p->slotlist);
 584                 if (p->slotinfo)
 585                         xfree(p->slotinfo);
 586                 xfree(p);
 587         }
 588         if (handle)
 589                 dlclose(handle);
 590         return (-1);
 591 }
 592
 593 #endif /* ENABLE_PKCS11 */