crypto/openssh/ssh-pkcs11.c

   1 /* $OpenBSD: ssh-pkcs11.c,v 1.22 2016/02/12 00:20:30 djm 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 #include <openssl/x509.h>
  35
  36 #define CRYPTOKI_COMPAT
  37 #include "pkcs11.h"
  38
  39 #include "log.h"
  40 #include "misc.h"
  41 #include "sshkey.h"
  42 #include "ssh-pkcs11.h"
  43 #include "xmalloc.h"
  44
  45 struct pkcs11_slotinfo {
  46         CK_TOKEN_INFO           token;
  47         CK_SESSION_HANDLE       session;
  48         int                     logged_in;
  49 };
  50
  51 struct pkcs11_provider {
  52         char                    *name;
  53         void                    *handle;
  54         CK_FUNCTION_LIST        *function_list;
  55         CK_INFO                 info;
  56         CK_ULONG                nslots;
  57         CK_SLOT_ID              *slotlist;
  58         struct pkcs11_slotinfo  *slotinfo;
  59         int                     valid;
  60         int                     refcount;
  61         TAILQ_ENTRY(pkcs11_provider) next;
  62 };
  63
  64 TAILQ_HEAD(, pkcs11_provider) pkcs11_providers;
  65
  66 struct pkcs11_key {
  67         struct pkcs11_provider  *provider;
  68         CK_ULONG                slotidx;
  69         int                     (*orig_finish)(RSA *rsa);
  70         RSA_METHOD              rsa_method;
  71         char                    *keyid;
  72         int                     keyid_len;
  73 };
  74
  75 int pkcs11_interactive = 0;
  76
  77 int
  78 pkcs11_init(int interactive)
  79 {
  80         pkcs11_interactive = interactive;
  81         TAILQ_INIT(&pkcs11_providers);
  82         return (0);
  83 }
  84
  85 /*
  86  * finalize a provider shared libarary, it's no longer usable.
  87  * however, there might still be keys referencing this provider,
  88  * so the actuall freeing of memory is handled by pkcs11_provider_unref().
  89  * this is called when a provider gets unregistered.
  90  */
  91 static void
  92 pkcs11_provider_finalize(struct pkcs11_provider *p)
  93 {
  94         CK_RV rv;
  95         CK_ULONG i;
  96
  97         debug("pkcs11_provider_finalize: %p refcount %d valid %d",
  98             p, p->refcount, p->valid);
  99         if (!p->valid)
 100                 return;
 101         for (i = 0; i < p->nslots; i++) {
 102                 if (p->slotinfo[i].session &&
 103                     (rv = p->function_list->C_CloseSession(
 104                     p->slotinfo[i].session)) != CKR_OK)
 105                         error("C_CloseSession failed: %lu", rv);
 106         }
 107         if ((rv = p->function_list->C_Finalize(NULL)) != CKR_OK)
 108                 error("C_Finalize failed: %lu", rv);
 109         p->valid = 0;
 110         p->function_list = NULL;
 111         dlclose(p->handle);
 112 }
 113
 114 /*
 115  * remove a reference to the provider.
 116  * called when a key gets destroyed or when the provider is unregistered.
 117  */
 118 static void
 119 pkcs11_provider_unref(struct pkcs11_provider *p)
 120 {
 121         debug("pkcs11_provider_unref: %p refcount %d", p, p->refcount);
 122         if (--p->refcount <= 0) {
 123                 if (p->valid)
 124                         error("pkcs11_provider_unref: %p still valid", p);
 125                 free(p->slotlist);
 126                 free(p->slotinfo);
 127                 free(p);
 128         }
 129 }
 130
 131 /* unregister all providers, keys might still point to the providers */
 132 void
 133 pkcs11_terminate(void)
 134 {
 135         struct pkcs11_provider *p;
 136
 137         while ((p = TAILQ_FIRST(&pkcs11_providers)) != NULL) {
 138                 TAILQ_REMOVE(&pkcs11_providers, p, next);
 139                 pkcs11_provider_finalize(p);
 140                 pkcs11_provider_unref(p);
 141         }
 142 }
 143
 144 /* lookup provider by name */
 145 static struct pkcs11_provider *
 146 pkcs11_provider_lookup(char *provider_id)
 147 {
 148         struct pkcs11_provider *p;
 149
 150         TAILQ_FOREACH(p, &pkcs11_providers, next) {
 151                 debug("check %p %s", p, p->name);
 152                 if (!strcmp(provider_id, p->name))
 153                         return (p);
 154         }
 155         return (NULL);
 156 }
 157
 158 /* unregister provider by name */
 159 int
 160 pkcs11_del_provider(char *provider_id)
 161 {
 162         struct pkcs11_provider *p;
 163
 164         if ((p = pkcs11_provider_lookup(provider_id)) != NULL) {
 165                 TAILQ_REMOVE(&pkcs11_providers, p, next);
 166                 pkcs11_provider_finalize(p);
 167                 pkcs11_provider_unref(p);
 168                 return (0);
 169         }
 170         return (-1);
 171 }
 172
 173 /* openssl callback for freeing an RSA key */
 174 static int
 175 pkcs11_rsa_finish(RSA *rsa)
 176 {
 177         struct pkcs11_key       *k11;
 178         int rv = -1;
 179
 180         if ((k11 = RSA_get_app_data(rsa)) != NULL) {
 181                 if (k11->orig_finish)
 182                         rv = k11->orig_finish(rsa);
 183                 if (k11->provider)
 184                         pkcs11_provider_unref(k11->provider);
 185                 free(k11->keyid);
 186                 free(k11);
 187         }
 188         return (rv);
 189 }
 190
 191 /* find a single 'obj' for given attributes */
 192 static int
 193 pkcs11_find(struct pkcs11_provider *p, CK_ULONG slotidx, CK_ATTRIBUTE *attr,
 194     CK_ULONG nattr, CK_OBJECT_HANDLE *obj)
 195 {
 196         CK_FUNCTION_LIST        *f;
 197         CK_SESSION_HANDLE       session;
 198         CK_ULONG                nfound = 0;
 199         CK_RV                   rv;
 200         int                     ret = -1;
 201
 202         f = p->function_list;
 203         session = p->slotinfo[slotidx].session;
 204         if ((rv = f->C_FindObjectsInit(session, attr, nattr)) != CKR_OK) {
 205                 error("C_FindObjectsInit failed (nattr %lu): %lu", nattr, rv);
 206                 return (-1);
 207         }
 208         if ((rv = f->C_FindObjects(session, obj, 1, &nfound)) != CKR_OK ||
 209             nfound != 1) {
 210                 debug("C_FindObjects failed (nfound %lu nattr %lu): %lu",
 211                     nfound, nattr, rv);
 212         } else
 213                 ret = 0;
 214         if ((rv = f->C_FindObjectsFinal(session)) != CKR_OK)
 215                 error("C_FindObjectsFinal failed: %lu", rv);
 216         return (ret);
 217 }
 218
 219 /* openssl callback doing the actual signing operation */
 220 static int
 221 pkcs11_rsa_private_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
 222     int padding)
 223 {
 224         struct pkcs11_key       *k11;
 225         struct pkcs11_slotinfo  *si;
 226         CK_FUNCTION_LIST        *f;
 227         CK_OBJECT_HANDLE        obj;
 228         CK_ULONG                tlen = 0;
 229         CK_RV                   rv;
 230         CK_OBJECT_CLASS private_key_class = CKO_PRIVATE_KEY;
 231         CK_BBOOL                true_val = CK_TRUE;
 232         CK_MECHANISM            mech = {
 233                 CKM_RSA_PKCS, NULL_PTR, 0
 234         };
 235         CK_ATTRIBUTE            key_filter[] = {
 236                 {CKA_CLASS, NULL, sizeof(private_key_class) },
 237                 {CKA_ID, NULL, 0},
 238                 {CKA_SIGN, NULL, sizeof(true_val) }
 239         };
 240         char                    *pin = NULL, prompt[1024];
 241         int                     rval = -1;
 242
 243         key_filter[0].pValue = &private_key_class;
 244         key_filter[2].pValue = &true_val;
 245
 246         if ((k11 = RSA_get_app_data(rsa)) == NULL) {
 247                 error("RSA_get_app_data failed for rsa %p", rsa);
 248                 return (-1);
 249         }
 250         if (!k11->provider || !k11->provider->valid) {
 251                 error("no pkcs11 (valid) provider for rsa %p", rsa);
 252                 return (-1);
 253         }
 254         f = k11->provider->function_list;
 255         si = &k11->provider->slotinfo[k11->slotidx];
 256         if ((si->token.flags & CKF_LOGIN_REQUIRED) && !si->logged_in) {
 257                 if (!pkcs11_interactive) {
 258                         error("need pin entry%s", (si->token.flags &
 259                             CKF_PROTECTED_AUTHENTICATION_PATH) ?
 260                             " on reader keypad" : "");
 261                         return (-1);
 262                 }
 263                 if (si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH)
 264                         verbose("Deferring PIN entry to reader keypad.");
 265                 else {
 266                         snprintf(prompt, sizeof(prompt),
 267                             "Enter PIN for '%s': ", si->token.label);
 268                         pin = read_passphrase(prompt, RP_ALLOW_EOF);
 269                         if (pin == NULL)
 270                                 return (-1);    /* bail out */
 271                 }
 272                 rv = f->C_Login(si->session, CKU_USER, (u_char *)pin,
 273                     (pin != NULL) ? strlen(pin) : 0);
 274                 if (pin != NULL) {
 275                         explicit_bzero(pin, strlen(pin));
 276                         free(pin);
 277                 }
 278                 if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
 279                         error("C_Login failed: %lu", rv);
 280                         return (-1);
 281                 }
 282                 si->logged_in = 1;
 283         }
 284         key_filter[1].pValue = k11->keyid;
 285         key_filter[1].ulValueLen = k11->keyid_len;
 286         /* try to find object w/CKA_SIGN first, retry w/o */
 287         if (pkcs11_find(k11->provider, k11->slotidx, key_filter, 3, &obj) < 0 &&
 288             pkcs11_find(k11->provider, k11->slotidx, key_filter, 2, &obj) < 0) {
 289                 error("cannot find private key");
 290         } else if ((rv = f->C_SignInit(si->session, &mech, obj)) != CKR_OK) {
 291                 error("C_SignInit failed: %lu", rv);
 292         } else {
 293                 /* XXX handle CKR_BUFFER_TOO_SMALL */
 294                 tlen = RSA_size(rsa);
 295                 rv = f->C_Sign(si->session, (CK_BYTE *)from, flen, to, &tlen);
 296                 if (rv == CKR_OK)
 297                         rval = tlen;
 298                 else
 299                         error("C_Sign failed: %lu", rv);
 300         }
 301         return (rval);
 302 }
 303
 304 static int
 305 pkcs11_rsa_private_decrypt(int flen, const u_char *from, u_char *to, RSA *rsa,
 306     int padding)
 307 {
 308         return (-1);
 309 }
 310
 311 /* redirect private key operations for rsa key to pkcs11 token */
 312 static int
 313 pkcs11_rsa_wrap(struct pkcs11_provider *provider, CK_ULONG slotidx,
 314     CK_ATTRIBUTE *keyid_attrib, RSA *rsa)
 315 {
 316         struct pkcs11_key       *k11;
 317         const RSA_METHOD        *def = RSA_get_default_method();
 318
 319         k11 = xcalloc(1, sizeof(*k11));
 320         k11->provider = provider;
 321         provider->refcount++;   /* provider referenced by RSA key */
 322         k11->slotidx = slotidx;
 323         /* identify key object on smartcard */
 324         k11->keyid_len = keyid_attrib->ulValueLen;
 325         if (k11->keyid_len > 0) {
 326                 k11->keyid = xmalloc(k11->keyid_len);
 327                 memcpy(k11->keyid, keyid_attrib->pValue, k11->keyid_len);
 328         }
 329         k11->orig_finish = def->finish;
 330         memcpy(&k11->rsa_method, def, sizeof(k11->rsa_method));
 331         k11->rsa_method.name = "pkcs11";
 332         k11->rsa_method.rsa_priv_enc = pkcs11_rsa_private_encrypt;
 333         k11->rsa_method.rsa_priv_dec = pkcs11_rsa_private_decrypt;
 334         k11->rsa_method.finish = pkcs11_rsa_finish;
 335         RSA_set_method(rsa, &k11->rsa_method);
 336         RSA_set_app_data(rsa, k11);
 337         return (0);
 338 }
 339
 340 /* remove trailing spaces */
 341 static void
 342 rmspace(u_char *buf, size_t len)
 343 {
 344         size_t i;
 345
 346         if (!len)
 347                 return;
 348         for (i = len - 1;  i > 0; i--)
 349                 if (i == len - 1 || buf[i] == ' ')
 350                         buf[i] = '\0';
 351                 else
 352                         break;
 353 }
 354
 355 /*
 356  * open a pkcs11 session and login if required.
 357  * if pin == NULL we delay login until key use
 358  */
 359 static int
 360 pkcs11_open_session(struct pkcs11_provider *p, CK_ULONG slotidx, char *pin)
 361 {
 362         CK_RV                   rv;
 363         CK_FUNCTION_LIST        *f;
 364         CK_SESSION_HANDLE       session;
 365         int                     login_required;
 366
 367         f = p->function_list;
 368         login_required = p->slotinfo[slotidx].token.flags & CKF_LOGIN_REQUIRED;
 369         if (pin && login_required && !strlen(pin)) {
 370                 error("pin required");
 371                 return (-1);
 372         }
 373         if ((rv = f->C_OpenSession(p->slotlist[slotidx], CKF_RW_SESSION|
 374             CKF_SERIAL_SESSION, NULL, NULL, &session))
 375             != CKR_OK) {
 376                 error("C_OpenSession failed: %lu", rv);
 377                 return (-1);
 378         }
 379         if (login_required && pin) {
 380                 rv = f->C_Login(session, CKU_USER,
 381                     (u_char *)pin, strlen(pin));
 382                 if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
 383                         error("C_Login failed: %lu", rv);
 384                         if ((rv = f->C_CloseSession(session)) != CKR_OK)
 385                                 error("C_CloseSession failed: %lu", rv);
 386                         return (-1);
 387                 }
 388                 p->slotinfo[slotidx].logged_in = 1;
 389         }
 390         p->slotinfo[slotidx].session = session;
 391         return (0);
 392 }
 393
 394 /*
 395  * lookup public keys for token in slot identified by slotidx,
 396  * add 'wrapped' public keys to the 'keysp' array and increment nkeys.
 397  * keysp points to an (possibly empty) array with *nkeys keys.
 398  */
 399 static int pkcs11_fetch_keys_filter(struct pkcs11_provider *, CK_ULONG,
 400     CK_ATTRIBUTE [], CK_ATTRIBUTE [3], struct sshkey ***, int *)
 401         __attribute__((__bounded__(__minbytes__,4, 3 * sizeof(CK_ATTRIBUTE))));
 402
 403 static int
 404 pkcs11_fetch_keys(struct pkcs11_provider *p, CK_ULONG slotidx,
 405     struct sshkey ***keysp, int *nkeys)
 406 {
 407         CK_OBJECT_CLASS pubkey_class = CKO_PUBLIC_KEY;
 408         CK_OBJECT_CLASS cert_class = CKO_CERTIFICATE;
 409         CK_ATTRIBUTE            pubkey_filter[] = {
 410                 { CKA_CLASS, NULL, sizeof(pubkey_class) }
 411         };
 412         CK_ATTRIBUTE            cert_filter[] = {
 413                 { CKA_CLASS, NULL, sizeof(cert_class) }
 414         };
 415         CK_ATTRIBUTE            pubkey_attribs[] = {
 416                 { CKA_ID, NULL, 0 },
 417                 { CKA_MODULUS, NULL, 0 },
 418                 { CKA_PUBLIC_EXPONENT, NULL, 0 }
 419         };
 420         CK_ATTRIBUTE            cert_attribs[] = {
 421                 { CKA_ID, NULL, 0 },
 422                 { CKA_SUBJECT, NULL, 0 },
 423                 { CKA_VALUE, NULL, 0 }
 424         };
 425         pubkey_filter[0].pValue = &pubkey_class;
 426         cert_filter[0].pValue = &cert_class;
 427
 428         if (pkcs11_fetch_keys_filter(p, slotidx, pubkey_filter, pubkey_attribs,
 429             keysp, nkeys) < 0 ||
 430             pkcs11_fetch_keys_filter(p, slotidx, cert_filter, cert_attribs,
 431             keysp, nkeys) < 0)
 432                 return (-1);
 433         return (0);
 434 }
 435
 436 static int
 437 pkcs11_key_included(struct sshkey ***keysp, int *nkeys, struct sshkey *key)
 438 {
 439         int i;
 440
 441         for (i = 0; i < *nkeys; i++)
 442                 if (sshkey_equal(key, (*keysp)[i]))
 443                         return (1);
 444         return (0);
 445 }
 446
 447 static int
 448 pkcs11_fetch_keys_filter(struct pkcs11_provider *p, CK_ULONG slotidx,
 449     CK_ATTRIBUTE filter[], CK_ATTRIBUTE attribs[3],
 450     struct sshkey ***keysp, int *nkeys)
 451 {
 452         struct sshkey           *key;
 453         RSA                     *rsa;
 454         X509                    *x509;
 455         EVP_PKEY                *evp;
 456         int                     i;
 457         const u_char            *cp;
 458         CK_RV                   rv;
 459         CK_OBJECT_HANDLE        obj;
 460         CK_ULONG                nfound;
 461         CK_SESSION_HANDLE       session;
 462         CK_FUNCTION_LIST        *f;
 463
 464         f = p->function_list;
 465         session = p->slotinfo[slotidx].session;
 466         /* setup a filter the looks for public keys */
 467         if ((rv = f->C_FindObjectsInit(session, filter, 1)) != CKR_OK) {
 468                 error("C_FindObjectsInit failed: %lu", rv);
 469                 return (-1);
 470         }
 471         while (1) {
 472                 /* XXX 3 attributes in attribs[] */
 473                 for (i = 0; i < 3; i++) {
 474                         attribs[i].pValue = NULL;
 475                         attribs[i].ulValueLen = 0;
 476                 }
 477                 if ((rv = f->C_FindObjects(session, &obj, 1, &nfound)) != CKR_OK
 478                     || nfound == 0)
 479                         break;
 480                 /* found a key, so figure out size of the attributes */
 481                 if ((rv = f->C_GetAttributeValue(session, obj, attribs, 3))
 482                     != CKR_OK) {
 483                         error("C_GetAttributeValue failed: %lu", rv);
 484                         continue;
 485                 }
 486                 /*
 487                  * Allow CKA_ID (always first attribute) to be empty, but
 488                  * ensure that none of the others are zero length.
 489                  * XXX assumes CKA_ID is always first.
 490                  */
 491                 if (attribs[1].ulValueLen == 0 ||
 492                     attribs[2].ulValueLen == 0) {
 493                         continue;
 494                 }
 495                 /* allocate buffers for attributes */
 496                 for (i = 0; i < 3; i++) {
 497                         if (attribs[i].ulValueLen > 0) {
 498                                 attribs[i].pValue = xmalloc(
 499                                     attribs[i].ulValueLen);
 500                         }
 501                 }
 502
 503                 /*
 504                  * retrieve ID, modulus and public exponent of RSA key,
 505                  * or ID, subject and value for certificates.
 506                  */
 507                 rsa = NULL;
 508                 if ((rv = f->C_GetAttributeValue(session, obj, attribs, 3))
 509                     != CKR_OK) {
 510                         error("C_GetAttributeValue failed: %lu", rv);
 511                 } else if (attribs[1].type == CKA_MODULUS ) {
 512                         if ((rsa = RSA_new()) == NULL) {
 513                                 error("RSA_new failed");
 514                         } else {
 515                                 rsa->n = BN_bin2bn(attribs[1].pValue,
 516                                     attribs[1].ulValueLen, NULL);
 517                                 rsa->e = BN_bin2bn(attribs[2].pValue,
 518                                     attribs[2].ulValueLen, NULL);
 519                         }
 520                 } else {
 521                         cp = attribs[2].pValue;
 522                         if ((x509 = X509_new()) == NULL) {
 523                                 error("X509_new failed");
 524                         } else if (d2i_X509(&x509, &cp, attribs[2].ulValueLen)
 525                             == NULL) {
 526                                 error("d2i_X509 failed");
 527                         } else if ((evp = X509_get_pubkey(x509)) == NULL ||
 528                             evp->type != EVP_PKEY_RSA ||
 529                             evp->pkey.rsa == NULL) {
 530                                 debug("X509_get_pubkey failed or no rsa");
 531                         } else if ((rsa = RSAPublicKey_dup(evp->pkey.rsa))
 532                             == NULL) {
 533                                 error("RSAPublicKey_dup");
 534                         }
 535                         if (x509)
 536                                 X509_free(x509);
 537                 }
 538                 if (rsa && rsa->n && rsa->e &&
 539                     pkcs11_rsa_wrap(p, slotidx, &attribs[0], rsa) == 0) {
 540                         key = sshkey_new(KEY_UNSPEC);
 541                         key->rsa = rsa;
 542                         key->type = KEY_RSA;
 543                         key->flags |= SSHKEY_FLAG_EXT;
 544                         if (pkcs11_key_included(keysp, nkeys, key)) {
 545                                 sshkey_free(key);
 546                         } else {
 547                                 /* expand key array and add key */
 548                                 *keysp = xreallocarray(*keysp, *nkeys + 1,
 549                                     sizeof(struct sshkey *));
 550                                 (*keysp)[*nkeys] = key;
 551                                 *nkeys = *nkeys + 1;
 552                                 debug("have %d keys", *nkeys);
 553                         }
 554                 } else if (rsa) {
 555                         RSA_free(rsa);
 556                 }
 557                 for (i = 0; i < 3; i++)
 558                         free(attribs[i].pValue);
 559         }
 560         if ((rv = f->C_FindObjectsFinal(session)) != CKR_OK)
 561                 error("C_FindObjectsFinal failed: %lu", rv);
 562         return (0);
 563 }
 564
 565 /* register a new provider, fails if provider already exists */
 566 int
 567 pkcs11_add_provider(char *provider_id, char *pin, struct sshkey ***keyp)
 568 {
 569         int nkeys, need_finalize = 0;
 570         struct pkcs11_provider *p = NULL;
 571         void *handle = NULL;
 572         CK_RV (*getfunctionlist)(CK_FUNCTION_LIST **);
 573         CK_RV rv;
 574         CK_FUNCTION_LIST *f = NULL;
 575         CK_TOKEN_INFO *token;
 576         CK_ULONG i;
 577
 578         *keyp = NULL;
 579         if (pkcs11_provider_lookup(provider_id) != NULL) {
 580                 error("provider already registered: %s", provider_id);
 581                 goto fail;
 582         }
 583         /* open shared pkcs11-libarary */
 584         if ((handle = dlopen(provider_id, RTLD_NOW)) == NULL) {
 585                 error("dlopen %s failed: %s", provider_id, dlerror());
 586                 goto fail;
 587         }
 588         if ((getfunctionlist = dlsym(handle, "C_GetFunctionList")) == NULL) {
 589                 error("dlsym(C_GetFunctionList) failed: %s", dlerror());
 590                 goto fail;
 591         }
 592         p = xcalloc(1, sizeof(*p));
 593         p->name = xstrdup(provider_id);
 594         p->handle = handle;
 595         /* setup the pkcs11 callbacks */
 596         if ((rv = (*getfunctionlist)(&f)) != CKR_OK) {
 597                 error("C_GetFunctionList failed: %lu", rv);
 598                 goto fail;
 599         }
 600         p->function_list = f;
 601         if ((rv = f->C_Initialize(NULL)) != CKR_OK) {
 602                 error("C_Initialize failed: %lu", rv);
 603                 goto fail;
 604         }
 605         need_finalize = 1;
 606         if ((rv = f->C_GetInfo(&p->info)) != CKR_OK) {
 607                 error("C_GetInfo failed: %lu", rv);
 608                 goto fail;
 609         }
 610         rmspace(p->info.manufacturerID, sizeof(p->info.manufacturerID));
 611         rmspace(p->info.libraryDescription, sizeof(p->info.libraryDescription));
 612         debug("manufacturerID <%s> cryptokiVersion %d.%d"
 613             " libraryDescription <%s> libraryVersion %d.%d",
 614             p->info.manufacturerID,
 615             p->info.cryptokiVersion.major,
 616             p->info.cryptokiVersion.minor,
 617             p->info.libraryDescription,
 618             p->info.libraryVersion.major,
 619             p->info.libraryVersion.minor);
 620         if ((rv = f->C_GetSlotList(CK_TRUE, NULL, &p->nslots)) != CKR_OK) {
 621                 error("C_GetSlotList failed: %lu", rv);
 622                 goto fail;
 623         }
 624         if (p->nslots == 0) {
 625                 error("no slots");
 626                 goto fail;
 627         }
 628         p->slotlist = xcalloc(p->nslots, sizeof(CK_SLOT_ID));
 629         if ((rv = f->C_GetSlotList(CK_TRUE, p->slotlist, &p->nslots))
 630             != CKR_OK) {
 631                 error("C_GetSlotList failed: %lu", rv);
 632                 goto fail;
 633         }
 634         p->slotinfo = xcalloc(p->nslots, sizeof(struct pkcs11_slotinfo));
 635         p->valid = 1;
 636         nkeys = 0;
 637         for (i = 0; i < p->nslots; i++) {
 638                 token = &p->slotinfo[i].token;
 639                 if ((rv = f->C_GetTokenInfo(p->slotlist[i], token))
 640                     != CKR_OK) {
 641                         error("C_GetTokenInfo failed: %lu", rv);
 642                         continue;
 643                 }
 644                 if ((token->flags & CKF_TOKEN_INITIALIZED) == 0) {
 645                         debug2("%s: ignoring uninitialised token in slot %lu",
 646                             __func__, (unsigned long)i);
 647                         continue;
 648                 }
 649                 rmspace(token->label, sizeof(token->label));
 650                 rmspace(token->manufacturerID, sizeof(token->manufacturerID));
 651                 rmspace(token->model, sizeof(token->model));
 652                 rmspace(token->serialNumber, sizeof(token->serialNumber));
 653                 debug("label <%s> manufacturerID <%s> model <%s> serial <%s>"
 654                     " flags 0x%lx",
 655                     token->label, token->manufacturerID, token->model,
 656                     token->serialNumber, token->flags);
 657                 /* open session, login with pin and retrieve public keys */
 658                 if (pkcs11_open_session(p, i, pin) == 0)
 659                         pkcs11_fetch_keys(p, i, keyp, &nkeys);
 660         }
 661         if (nkeys > 0) {
 662                 TAILQ_INSERT_TAIL(&pkcs11_providers, p, next);
 663                 p->refcount++;  /* add to provider list */
 664                 return (nkeys);
 665         }
 666         error("no keys");
 667         /* don't add the provider, since it does not have any keys */
 668 fail:
 669         if (need_finalize && (rv = f->C_Finalize(NULL)) != CKR_OK)
 670                 error("C_Finalize failed: %lu", rv);
 671         if (p) {
 672                 free(p->slotlist);
 673                 free(p->slotinfo);
 674                 free(p);
 675         }
 676         if (handle)
 677                 dlclose(handle);
 678         return (-1);
 679 }
 680
 681 #else
 682
 683 int
 684 pkcs11_init(int interactive)
 685 {
 686         return (0);
 687 }
 688
 689 void
 690 pkcs11_terminate(void)
 691 {
 692         return;
 693 }
 694
 695 #endif /* ENABLE_PKCS11 */