security/keys/request_key.c

   1 /* Request a key from userspace
   2  *
   3  * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  * See Documentation/security/keys-request-key.txt
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/sched.h>
  16 #include <linux/kmod.h>
  17 #include <linux/err.h>
  18 #include <linux/keyctl.h>
  19 #include <linux/slab.h>
  20 #include "internal.h"
  21
  22 #define key_negative_timeout    60      /* default timeout on a negative key's existence */
  23
  24 /*
  25  * wait_on_bit() sleep function for uninterruptible waiting
  26  */
  27 static int key_wait_bit(void *flags)
  28 {
  29         schedule();
  30         return 0;
  31 }
  32
  33 /*
  34  * wait_on_bit() sleep function for interruptible waiting
  35  */
  36 static int key_wait_bit_intr(void *flags)
  37 {
  38         schedule();
  39         return signal_pending(current) ? -ERESTARTSYS : 0;
  40 }
  41
  42 /**
  43  * complete_request_key - Complete the construction of a key.
  44  * @cons: The key construction record.
  45  * @error: The success or failute of the construction.
  46  *
  47  * Complete the attempt to construct a key.  The key will be negated
  48  * if an error is indicated.  The authorisation key will be revoked
  49  * unconditionally.
  50  */
  51 void complete_request_key(struct key_construction *cons, int error)
  52 {
  53         kenter("{%d,%d},%d", cons->key->serial, cons->authkey->serial, error);
  54
  55         if (error < 0)
  56                 key_negate_and_link(cons->key, key_negative_timeout, NULL,
  57                                     cons->authkey);
  58         else
  59                 key_revoke(cons->authkey);
  60
  61         key_put(cons->key);
  62         key_put(cons->authkey);
  63         kfree(cons);
  64 }
  65 EXPORT_SYMBOL(complete_request_key);
  66
  67 /*
  68  * Initialise a usermode helper that is going to have a specific session
  69  * keyring.
  70  *
  71  * This is called in context of freshly forked kthread before kernel_execve(),
  72  * so we can simply install the desired session_keyring at this point.
  73  */
  74 static int umh_keys_init(struct subprocess_info *info, struct cred *cred)
  75 {
  76         struct key *keyring = info->data;
  77
  78         return install_session_keyring_to_cred(cred, keyring);
  79 }
  80
  81 /*
  82  * Clean up a usermode helper with session keyring.
  83  */
  84 static void umh_keys_cleanup(struct subprocess_info *info)
  85 {
  86         struct key *keyring = info->data;
  87         key_put(keyring);
  88 }
  89
  90 /*
  91  * Call a usermode helper with a specific session keyring.
  92  */
  93 static int call_usermodehelper_keys(char *path, char **argv, char **envp,
  94                                         struct key *session_keyring, int wait)
  95 {
  96         return call_usermodehelper_fns(path, argv, envp, wait,
  97                                        umh_keys_init, umh_keys_cleanup,
  98                                        key_get(session_keyring));
  99 }
 100
 101 /*
 102  * Request userspace finish the construction of a key
 103  * - execute "/sbin/request-key <op> <key> <uid> <gid> <keyring> <keyring> <keyring>"
 104  */
 105 static int call_sbin_request_key(struct key_construction *cons,
 106                                  const char *op,
 107                                  void *aux)
 108 {
 109         const struct cred *cred = current_cred();
 110         key_serial_t prkey, sskey;
 111         struct key *key = cons->key, *authkey = cons->authkey, *keyring,
 112                 *session;
 113         char *argv[9], *envp[3], uid_str[12], gid_str[12];
 114         char key_str[12], keyring_str[3][12];
 115         char desc[20];
 116         int ret, i;
 117
 118         kenter("{%d},{%d},%s", key->serial, authkey->serial, op);
 119
 120         ret = install_user_keyrings();
 121         if (ret < 0)
 122                 goto error_alloc;
 123
 124         /* allocate a new session keyring */
 125         sprintf(desc, "_req.%u", key->serial);
 126
 127         cred = get_current_cred();
 128         keyring = keyring_alloc(desc, cred->fsuid, cred->fsgid, cred,
 129                                 KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ,
 130                                 KEY_ALLOC_QUOTA_OVERRUN, NULL);
 131         put_cred(cred);
 132         if (IS_ERR(keyring)) {
 133                 ret = PTR_ERR(keyring);
 134                 goto error_alloc;
 135         }
 136
 137         /* attach the auth key to the session keyring */
 138         ret = key_link(keyring, authkey);
 139         if (ret < 0)
 140                 goto error_link;
 141
 142         /* record the UID and GID */
 143         sprintf(uid_str, "%d", from_kuid(&init_user_ns, cred->fsuid));
 144         sprintf(gid_str, "%d", from_kgid(&init_user_ns, cred->fsgid));
 145
 146         /* we say which key is under construction */
 147         sprintf(key_str, "%d", key->serial);
 148
 149         /* we specify the process's default keyrings */
 150         sprintf(keyring_str[0], "%d",
 151                 cred->thread_keyring ? cred->thread_keyring->serial : 0);
 152
 153         prkey = 0;
 154         if (cred->process_keyring)
 155                 prkey = cred->process_keyring->serial;
 156         sprintf(keyring_str[1], "%d", prkey);
 157
 158         rcu_read_lock();
 159         session = rcu_dereference(cred->session_keyring);
 160         if (!session)
 161                 session = cred->user->session_keyring;
 162         sskey = session->serial;
 163         rcu_read_unlock();
 164
 165         sprintf(keyring_str[2], "%d", sskey);
 166
 167         /* set up a minimal environment */
 168         i = 0;
 169         envp[i++] = "HOME=/";
 170         envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 171         envp[i] = NULL;
 172
 173         /* set up the argument list */
 174         i = 0;
 175         argv[i++] = "/sbin/request-key";
 176         argv[i++] = (char *) op;
 177         argv[i++] = key_str;
 178         argv[i++] = uid_str;
 179         argv[i++] = gid_str;
 180         argv[i++] = keyring_str[0];
 181         argv[i++] = keyring_str[1];
 182         argv[i++] = keyring_str[2];
 183         argv[i] = NULL;
 184
 185         /* do it */
 186         ret = call_usermodehelper_keys(argv[0], argv, envp, keyring,
 187                                        UMH_WAIT_PROC);
 188         kdebug("usermode -> 0x%x", ret);
 189         if (ret >= 0) {
 190                 /* ret is the exit/wait code */
 191                 if (test_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags) ||
 192                     key_validate(key) < 0)
 193                         ret = -ENOKEY;
 194                 else
 195                         /* ignore any errors from userspace if the key was
 196                          * instantiated */
 197                         ret = 0;
 198         }
 199
 200 error_link:
 201         key_put(keyring);
 202
 203 error_alloc:
 204         complete_request_key(cons, ret);
 205         kleave(" = %d", ret);
 206         return ret;
 207 }
 208
 209 /*
 210  * Call out to userspace for key construction.
 211  *
 212  * Program failure is ignored in favour of key status.
 213  */
 214 static int construct_key(struct key *key, const void *callout_info,
 215                          size_t callout_len, void *aux,
 216                          struct key *dest_keyring)
 217 {
 218         struct key_construction *cons;
 219         request_key_actor_t actor;
 220         struct key *authkey;
 221         int ret;
 222
 223         kenter("%d,%p,%zu,%p", key->serial, callout_info, callout_len, aux);
 224
 225         cons = kmalloc(sizeof(*cons), GFP_KERNEL);
 226         if (!cons)
 227                 return -ENOMEM;
 228
 229         /* allocate an authorisation key */
 230         authkey = request_key_auth_new(key, callout_info, callout_len,
 231                                        dest_keyring);
 232         if (IS_ERR(authkey)) {
 233                 kfree(cons);
 234                 ret = PTR_ERR(authkey);
 235                 authkey = NULL;
 236         } else {
 237                 cons->authkey = key_get(authkey);
 238                 cons->key = key_get(key);
 239
 240                 /* make the call */
 241                 actor = call_sbin_request_key;
 242                 if (key->type->request_key)
 243                         actor = key->type->request_key;
 244
 245                 ret = actor(cons, "create", aux);
 246
 247                 /* check that the actor called complete_request_key() prior to
 248                  * returning an error */
 249                 WARN_ON(ret < 0 &&
 250                         !test_bit(KEY_FLAG_REVOKED, &authkey->flags));
 251                 key_put(authkey);
 252         }
 253
 254         kleave(" = %d", ret);
 255         return ret;
 256 }
 257
 258 /*
 259  * Get the appropriate destination keyring for the request.
 260  *
 261  * The keyring selected is returned with an extra reference upon it which the
 262  * caller must release.
 263  */
 264 static void construct_get_dest_keyring(struct key **_dest_keyring)
 265 {
 266         struct request_key_auth *rka;
 267         const struct cred *cred = current_cred();
 268         struct key *dest_keyring = *_dest_keyring, *authkey;
 269
 270         kenter("%p", dest_keyring);
 271
 272         /* find the appropriate keyring */
 273         if (dest_keyring) {
 274                 /* the caller supplied one */
 275                 key_get(dest_keyring);
 276         } else {
 277                 /* use a default keyring; falling through the cases until we
 278                  * find one that we actually have */
 279                 switch (cred->jit_keyring) {
 280                 case KEY_REQKEY_DEFL_DEFAULT:
 281                 case KEY_REQKEY_DEFL_REQUESTOR_KEYRING:
 282                         if (cred->request_key_auth) {
 283                                 authkey = cred->request_key_auth;
 284                                 down_read(&authkey->sem);
 285                                 rka = authkey->payload.data;
 286                                 if (!test_bit(KEY_FLAG_REVOKED,
 287                                               &authkey->flags))
 288                                         dest_keyring =
 289                                                 key_get(rka->dest_keyring);
 290                                 up_read(&authkey->sem);
 291                                 if (dest_keyring)
 292                                         break;
 293                         }
 294
 295                 case KEY_REQKEY_DEFL_THREAD_KEYRING:
 296                         dest_keyring = key_get(cred->thread_keyring);
 297                         if (dest_keyring)
 298                                 break;
 299
 300                 case KEY_REQKEY_DEFL_PROCESS_KEYRING:
 301                         dest_keyring = key_get(cred->process_keyring);
 302                         if (dest_keyring)
 303                                 break;
 304
 305                 case KEY_REQKEY_DEFL_SESSION_KEYRING:
 306                         rcu_read_lock();
 307                         dest_keyring = key_get(
 308                                 rcu_dereference(cred->session_keyring));
 309                         rcu_read_unlock();
 310
 311                         if (dest_keyring)
 312                                 break;
 313
 314                 case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
 315                         dest_keyring =
 316                                 key_get(cred->user->session_keyring);
 317                         break;
 318
 319                 case KEY_REQKEY_DEFL_USER_KEYRING:
 320                         dest_keyring = key_get(cred->user->uid_keyring);
 321                         break;
 322
 323                 case KEY_REQKEY_DEFL_GROUP_KEYRING:
 324                 default:
 325                         BUG();
 326                 }
 327         }
 328
 329         *_dest_keyring = dest_keyring;
 330         kleave(" [dk %d]", key_serial(dest_keyring));
 331         return;
 332 }
 333
 334 /*
 335  * Allocate a new key in under-construction state and attempt to link it in to
 336  * the requested keyring.
 337  *
 338  * May return a key that's already under construction instead if there was a
 339  * race between two thread calling request_key().
 340  */
 341 static int construct_alloc_key(struct key_type *type,
 342                                const char *description,
 343                                struct key *dest_keyring,
 344                                unsigned long flags,
 345                                struct key_user *user,
 346                                struct key **_key)
 347 {
 348         const struct cred *cred = current_cred();
 349         unsigned long prealloc;
 350         struct key *key;
 351         key_perm_t perm;
 352         key_ref_t key_ref;
 353         int ret;
 354
 355         kenter("%s,%s,,,", type->name, description);
 356
 357         *_key = NULL;
 358         mutex_lock(&user->cons_lock);
 359
 360         perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
 361         perm |= KEY_USR_VIEW;
 362         if (type->read)
 363                 perm |= KEY_POS_READ;
 364         if (type == &key_type_keyring || type->update)
 365                 perm |= KEY_POS_WRITE;
 366
 367         key = key_alloc(type, description, cred->fsuid, cred->fsgid, cred,
 368                         perm, flags);
 369         if (IS_ERR(key))
 370                 goto alloc_failed;
 371
 372         set_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags);
 373
 374         if (dest_keyring) {
 375                 ret = __key_link_begin(dest_keyring, type, description,
 376                                        &prealloc);
 377                 if (ret < 0)
 378                         goto link_prealloc_failed;
 379         }
 380
 381         /* attach the key to the destination keyring under lock, but we do need
 382          * to do another check just in case someone beat us to it whilst we
 383          * waited for locks */
 384         mutex_lock(&key_construction_mutex);
 385
 386         key_ref = search_process_keyrings(type, description, type->match, cred);
 387         if (!IS_ERR(key_ref))
 388                 goto key_already_present;
 389
 390         if (dest_keyring)
 391                 __key_link(dest_keyring, key, &prealloc);
 392
 393         mutex_unlock(&key_construction_mutex);
 394         if (dest_keyring)
 395                 __key_link_end(dest_keyring, type, prealloc);
 396         mutex_unlock(&user->cons_lock);
 397         *_key = key;
 398         kleave(" = 0 [%d]", key_serial(key));
 399         return 0;
 400
 401         /* the key is now present - we tell the caller that we found it by
 402          * returning -EINPROGRESS  */
 403 key_already_present:
 404         key_put(key);
 405         mutex_unlock(&key_construction_mutex);
 406         key = key_ref_to_ptr(key_ref);
 407         if (dest_keyring) {
 408                 ret = __key_link_check_live_key(dest_keyring, key);
 409                 if (ret == 0)
 410                         __key_link(dest_keyring, key, &prealloc);
 411                 __key_link_end(dest_keyring, type, prealloc);
 412                 if (ret < 0)
 413                         goto link_check_failed;
 414         }
 415         mutex_unlock(&user->cons_lock);
 416         *_key = key;
 417         kleave(" = -EINPROGRESS [%d]", key_serial(key));
 418         return -EINPROGRESS;
 419
 420 link_check_failed:
 421         mutex_unlock(&user->cons_lock);
 422         key_put(key);
 423         kleave(" = %d [linkcheck]", ret);
 424         return ret;
 425
 426 link_prealloc_failed:
 427         mutex_unlock(&user->cons_lock);
 428         kleave(" = %d [prelink]", ret);
 429         return ret;
 430
 431 alloc_failed:
 432         mutex_unlock(&user->cons_lock);
 433         kleave(" = %ld", PTR_ERR(key));
 434         return PTR_ERR(key);
 435 }
 436
 437 /*
 438  * Commence key construction.
 439  */
 440 static struct key *construct_key_and_link(struct key_type *type,
 441                                           const char *description,
 442                                           const char *callout_info,
 443                                           size_t callout_len,
 444                                           void *aux,
 445                                           struct key *dest_keyring,
 446                                           unsigned long flags)
 447 {
 448         struct key_user *user;
 449         struct key *key;
 450         int ret;
 451
 452         kenter("");
 453
 454         user = key_user_lookup(current_fsuid());
 455         if (!user)
 456                 return ERR_PTR(-ENOMEM);
 457
 458         construct_get_dest_keyring(&dest_keyring);
 459
 460         ret = construct_alloc_key(type, description, dest_keyring, flags, user,
 461                                   &key);
 462         key_user_put(user);
 463
 464         if (ret == 0) {
 465                 ret = construct_key(key, callout_info, callout_len, aux,
 466                                     dest_keyring);
 467                 if (ret < 0) {
 468                         kdebug("cons failed");
 469                         goto construction_failed;
 470                 }
 471         } else if (ret == -EINPROGRESS) {
 472                 ret = 0;
 473         } else {
 474                 goto couldnt_alloc_key;
 475         }
 476
 477         key_put(dest_keyring);
 478         kleave(" = key %d", key_serial(key));
 479         return key;
 480
 481 construction_failed:
 482         key_negate_and_link(key, key_negative_timeout, NULL, NULL);
 483         key_put(key);
 484 couldnt_alloc_key:
 485         key_put(dest_keyring);
 486         kleave(" = %d", ret);
 487         return ERR_PTR(ret);
 488 }
 489
 490 /**
 491  * request_key_and_link - Request a key and cache it in a keyring.
 492  * @type: The type of key we want.
 493  * @description: The searchable description of the key.
 494  * @callout_info: The data to pass to the instantiation upcall (or NULL).
 495  * @callout_len: The length of callout_info.
 496  * @aux: Auxiliary data for the upcall.
 497  * @dest_keyring: Where to cache the key.
 498  * @flags: Flags to key_alloc().
 499  *
 500  * A key matching the specified criteria is searched for in the process's
 501  * keyrings and returned with its usage count incremented if found.  Otherwise,
 502  * if callout_info is not NULL, a key will be allocated and some service
 503  * (probably in userspace) will be asked to instantiate it.
 504  *
 505  * If successfully found or created, the key will be linked to the destination
 506  * keyring if one is provided.
 507  *
 508  * Returns a pointer to the key if successful; -EACCES, -ENOKEY, -EKEYREVOKED
 509  * or -EKEYEXPIRED if an inaccessible, negative, revoked or expired key was
 510  * found; -ENOKEY if no key was found and no @callout_info was given; -EDQUOT
 511  * if insufficient key quota was available to create a new key; or -ENOMEM if
 512  * insufficient memory was available.
 513  *
 514  * If the returned key was created, then it may still be under construction,
 515  * and wait_for_key_construction() should be used to wait for that to complete.
 516  */
 517 struct key *request_key_and_link(struct key_type *type,
 518                                  const char *description,
 519                                  const void *callout_info,
 520                                  size_t callout_len,
 521                                  void *aux,
 522                                  struct key *dest_keyring,
 523                                  unsigned long flags)
 524 {
 525         const struct cred *cred = current_cred();
 526         struct key *key;
 527         key_ref_t key_ref;
 528         int ret;
 529
 530         kenter("%s,%s,%p,%zu,%p,%p,%lx",
 531                type->name, description, callout_info, callout_len, aux,
 532                dest_keyring, flags);
 533
 534         /* search all the process keyrings for a key */
 535         key_ref = search_process_keyrings(type, description, type->match, cred);
 536
 537         if (!IS_ERR(key_ref)) {
 538                 key = key_ref_to_ptr(key_ref);
 539                 if (dest_keyring) {
 540                         construct_get_dest_keyring(&dest_keyring);
 541                         ret = key_link(dest_keyring, key);
 542                         key_put(dest_keyring);
 543                         if (ret < 0) {
 544                                 key_put(key);
 545                                 key = ERR_PTR(ret);
 546                                 goto error;
 547                         }
 548                 }
 549         } else if (PTR_ERR(key_ref) != -EAGAIN) {
 550                 key = ERR_CAST(key_ref);
 551         } else  {
 552                 /* the search failed, but the keyrings were searchable, so we
 553                  * should consult userspace if we can */
 554                 key = ERR_PTR(-ENOKEY);
 555                 if (!callout_info)
 556                         goto error;
 557
 558                 key = construct_key_and_link(type, description, callout_info,
 559                                              callout_len, aux, dest_keyring,
 560                                              flags);
 561         }
 562
 563 error:
 564         kleave(" = %p", key);
 565         return key;
 566 }
 567
 568 /**
 569  * wait_for_key_construction - Wait for construction of a key to complete
 570  * @key: The key being waited for.
 571  * @intr: Whether to wait interruptibly.
 572  *
 573  * Wait for a key to finish being constructed.
 574  *
 575  * Returns 0 if successful; -ERESTARTSYS if the wait was interrupted; -ENOKEY
 576  * if the key was negated; or -EKEYREVOKED or -EKEYEXPIRED if the key was
 577  * revoked or expired.
 578  */
 579 int wait_for_key_construction(struct key *key, bool intr)
 580 {
 581         int ret;
 582
 583         ret = wait_on_bit(&key->flags, KEY_FLAG_USER_CONSTRUCT,
 584                           intr ? key_wait_bit_intr : key_wait_bit,
 585                           intr ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
 586         if (ret < 0)
 587                 return ret;
 588         if (test_bit(KEY_FLAG_NEGATIVE, &key->flags))
 589                 return key->type_data.reject_error;
 590         return key_validate(key);
 591 }
 592 EXPORT_SYMBOL(wait_for_key_construction);
 593
 594 /**
 595  * request_key - Request a key and wait for construction
 596  * @type: Type of key.
 597  * @description: The searchable description of the key.
 598  * @callout_info: The data to pass to the instantiation upcall (or NULL).
 599  *
 600  * As for request_key_and_link() except that it does not add the returned key
 601  * to a keyring if found, new keys are always allocated in the user's quota,
 602  * the callout_info must be a NUL-terminated string and no auxiliary data can
 603  * be passed.
 604  *
 605  * Furthermore, it then works as wait_for_key_construction() to wait for the
 606  * completion of keys undergoing construction with a non-interruptible wait.
 607  */
 608 struct key *request_key(struct key_type *type,
 609                         const char *description,
 610                         const char *callout_info)
 611 {
 612         struct key *key;
 613         size_t callout_len = 0;
 614         int ret;
 615
 616         if (callout_info)
 617                 callout_len = strlen(callout_info);
 618         key = request_key_and_link(type, description, callout_info, callout_len,
 619                                    NULL, NULL, KEY_ALLOC_IN_QUOTA);
 620         if (!IS_ERR(key)) {
 621                 ret = wait_for_key_construction(key, false);
 622                 if (ret < 0) {
 623                         key_put(key);
 624                         return ERR_PTR(ret);
 625                 }
 626         }
 627         return key;
 628 }
 629 EXPORT_SYMBOL(request_key);
 630
 631 /**
 632  * request_key_with_auxdata - Request a key with auxiliary data for the upcaller
 633  * @type: The type of key we want.
 634  * @description: The searchable description of the key.
 635  * @callout_info: The data to pass to the instantiation upcall (or NULL).
 636  * @callout_len: The length of callout_info.
 637  * @aux: Auxiliary data for the upcall.
 638  *
 639  * As for request_key_and_link() except that it does not add the returned key
 640  * to a keyring if found and new keys are always allocated in the user's quota.
 641  *
 642  * Furthermore, it then works as wait_for_key_construction() to wait for the
 643  * completion of keys undergoing construction with a non-interruptible wait.
 644  */
 645 struct key *request_key_with_auxdata(struct key_type *type,
 646                                      const char *description,
 647                                      const void *callout_info,
 648                                      size_t callout_len,
 649                                      void *aux)
 650 {
 651         struct key *key;
 652         int ret;
 653
 654         key = request_key_and_link(type, description, callout_info, callout_len,
 655                                    aux, NULL, KEY_ALLOC_IN_QUOTA);
 656         if (!IS_ERR(key)) {
 657                 ret = wait_for_key_construction(key, false);
 658                 if (ret < 0) {
 659                         key_put(key);
 660                         return ERR_PTR(ret);
 661                 }
 662         }
 663         return key;
 664 }
 665 EXPORT_SYMBOL(request_key_with_auxdata);
 666
 667 /*
 668  * request_key_async - Request a key (allow async construction)
 669  * @type: Type of key.
 670  * @description: The searchable description of the key.
 671  * @callout_info: The data to pass to the instantiation upcall (or NULL).
 672  * @callout_len: The length of callout_info.
 673  *
 674  * As for request_key_and_link() except that it does not add the returned key
 675  * to a keyring if found, new keys are always allocated in the user's quota and
 676  * no auxiliary data can be passed.
 677  *
 678  * The caller should call wait_for_key_construction() to wait for the
 679  * completion of the returned key if it is still undergoing construction.
 680  */
 681 struct key *request_key_async(struct key_type *type,
 682                               const char *description,
 683                               const void *callout_info,
 684                               size_t callout_len)
 685 {
 686         return request_key_and_link(type, description, callout_info,
 687                                     callout_len, NULL, NULL,
 688                                     KEY_ALLOC_IN_QUOTA);
 689 }
 690 EXPORT_SYMBOL(request_key_async);
 691
 692 /*
 693  * request a key with auxiliary data for the upcaller (allow async construction)
 694  * @type: Type of key.
 695  * @description: The searchable description of the key.
 696  * @callout_info: The data to pass to the instantiation upcall (or NULL).
 697  * @callout_len: The length of callout_info.
 698  * @aux: Auxiliary data for the upcall.
 699  *
 700  * As for request_key_and_link() except that it does not add the returned key
 701  * to a keyring if found and new keys are always allocated in the user's quota.
 702  *
 703  * The caller should call wait_for_key_construction() to wait for the
 704  * completion of the returned key if it is still undergoing construction.
 705  */
 706 struct key *request_key_async_with_auxdata(struct key_type *type,
 707                                            const char *description,
 708                                            const void *callout_info,
 709                                            size_t callout_len,
 710                                            void *aux)
 711 {
 712         return request_key_and_link(type, description, callout_info,
 713                                     callout_len, aux, NULL, KEY_ALLOC_IN_QUOTA);
 714 }
 715 EXPORT_SYMBOL(request_key_async_with_auxdata);