1/* 2 * fs/nfs/idmap.c 3 * 4 * UID and GID to name mapping for clients. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Marius Aamodt Eriksen <marius@umich.edu> 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its 21 * contributors may be used to endorse or promote products derived 22 * from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36#include <linux/types.h> 37#include <linux/parser.h> 38#include <linux/fs.h> 39#include <net/net_namespace.h> 40#include <linux/sunrpc/rpc_pipe_fs.h> 41#include <linux/nfs_fs.h> 42#include <linux/nfs_fs_sb.h> 43#include <linux/key.h> 44#include <linux/keyctl.h> 45#include <linux/key-type.h> 46#include <keys/user-type.h> 47#include <linux/module.h> 48 49#include "internal.h" 50#include "netns.h" 51#include "nfs4idmap.h" 52#include "nfs4trace.h" 53 54#define NFS_UINT_MAXLEN 11 55 56static const struct cred *id_resolver_cache; 57static struct key_type key_type_id_resolver_legacy; 58 59struct idmap_legacy_upcalldata { 60 struct rpc_pipe_msg pipe_msg; 61 struct idmap_msg idmap_msg; 62 struct key_construction *key_cons; 63 struct idmap *idmap; 64}; 65 66struct idmap { 67 struct rpc_pipe_dir_object idmap_pdo; 68 struct rpc_pipe *idmap_pipe; 69 struct idmap_legacy_upcalldata *idmap_upcall_data; 70 struct mutex idmap_mutex; 71}; 72 73/** 74 * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields 75 * @fattr: fully initialised struct nfs_fattr 76 * @owner_name: owner name string cache 77 * @group_name: group name string cache 78 */ 79void nfs_fattr_init_names(struct nfs_fattr *fattr, 80 struct nfs4_string *owner_name, 81 struct nfs4_string *group_name) 82{ 83 fattr->owner_name = owner_name; 84 fattr->group_name = group_name; 85} 86 87static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr) 88{ 89 fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME; 90 kfree(fattr->owner_name->data); 91} 92 93static void nfs_fattr_free_group_name(struct nfs_fattr *fattr) 94{ 95 fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME; 96 kfree(fattr->group_name->data); 97} 98 99static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr) 100{ 101 struct nfs4_string *owner = fattr->owner_name; 102 kuid_t uid; 103 104 if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)) 105 return false; 106 if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) { 107 fattr->uid = uid; 108 fattr->valid |= NFS_ATTR_FATTR_OWNER; 109 } 110 return true; 111} 112 113static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr) 114{ 115 struct nfs4_string *group = fattr->group_name; 116 kgid_t gid; 117 118 if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)) 119 return false; 120 if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) { 121 fattr->gid = gid; 122 fattr->valid |= NFS_ATTR_FATTR_GROUP; 123 } 124 return true; 125} 126 127/** 128 * nfs_fattr_free_names - free up the NFSv4 owner and group strings 129 * @fattr: a fully initialised nfs_fattr structure 130 */ 131void nfs_fattr_free_names(struct nfs_fattr *fattr) 132{ 133 if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME) 134 nfs_fattr_free_owner_name(fattr); 135 if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME) 136 nfs_fattr_free_group_name(fattr); 137} 138 139/** 140 * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free 141 * @server: pointer to the filesystem nfs_server structure 142 * @fattr: a fully initialised nfs_fattr structure 143 * 144 * This helper maps the cached NFSv4 owner/group strings in fattr into 145 * their numeric uid/gid equivalents, and then frees the cached strings. 146 */ 147void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr) 148{ 149 if (nfs_fattr_map_owner_name(server, fattr)) 150 nfs_fattr_free_owner_name(fattr); 151 if (nfs_fattr_map_group_name(server, fattr)) 152 nfs_fattr_free_group_name(fattr); 153} 154 155int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res) 156{ 157 unsigned long val; 158 char buf[16]; 159 160 if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf)) 161 return 0; 162 memcpy(buf, name, namelen); 163 buf[namelen] = '\0'; 164 if (kstrtoul(buf, 0, &val) != 0) 165 return 0; 166 *res = val; 167 return 1; 168} 169EXPORT_SYMBOL_GPL(nfs_map_string_to_numeric); 170 171static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen) 172{ 173 return snprintf(buf, buflen, "%u", id); 174} 175 176static struct key_type key_type_id_resolver = { 177 .name = "id_resolver", 178 .preparse = user_preparse, 179 .free_preparse = user_free_preparse, 180 .instantiate = generic_key_instantiate, 181 .revoke = user_revoke, 182 .destroy = user_destroy, 183 .describe = user_describe, 184 .read = user_read, 185}; 186 187int nfs_idmap_init(void) 188{ 189 struct cred *cred; 190 struct key *keyring; 191 int ret = 0; 192 193 printk(KERN_NOTICE "NFS: Registering the %s key type\n", 194 key_type_id_resolver.name); 195 196 cred = prepare_kernel_cred(NULL); 197 if (!cred) 198 return -ENOMEM; 199 200 keyring = keyring_alloc(".id_resolver", 201 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, 202 (KEY_POS_ALL & ~KEY_POS_SETATTR) | 203 KEY_USR_VIEW | KEY_USR_READ, 204 KEY_ALLOC_NOT_IN_QUOTA, NULL); 205 if (IS_ERR(keyring)) { 206 ret = PTR_ERR(keyring); 207 goto failed_put_cred; 208 } 209 210 ret = register_key_type(&key_type_id_resolver); 211 if (ret < 0) 212 goto failed_put_key; 213 214 ret = register_key_type(&key_type_id_resolver_legacy); 215 if (ret < 0) 216 goto failed_reg_legacy; 217 218 set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); 219 cred->thread_keyring = keyring; 220 cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; 221 id_resolver_cache = cred; 222 return 0; 223 224failed_reg_legacy: 225 unregister_key_type(&key_type_id_resolver); 226failed_put_key: 227 key_put(keyring); 228failed_put_cred: 229 put_cred(cred); 230 return ret; 231} 232 233void nfs_idmap_quit(void) 234{ 235 key_revoke(id_resolver_cache->thread_keyring); 236 unregister_key_type(&key_type_id_resolver); 237 unregister_key_type(&key_type_id_resolver_legacy); 238 put_cred(id_resolver_cache); 239} 240 241/* 242 * Assemble the description to pass to request_key() 243 * This function will allocate a new string and update dest to point 244 * at it. The caller is responsible for freeing dest. 245 * 246 * On error 0 is returned. Otherwise, the length of dest is returned. 247 */ 248static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen, 249 const char *type, size_t typelen, char **desc) 250{ 251 char *cp; 252 size_t desclen = typelen + namelen + 2; 253 254 *desc = kmalloc(desclen, GFP_KERNEL); 255 if (!*desc) 256 return -ENOMEM; 257 258 cp = *desc; 259 memcpy(cp, type, typelen); 260 cp += typelen; 261 *cp++ = ':'; 262 263 memcpy(cp, name, namelen); 264 cp += namelen; 265 *cp = '\0'; 266 return desclen; 267} 268 269static struct key *nfs_idmap_request_key(const char *name, size_t namelen, 270 const char *type, struct idmap *idmap) 271{ 272 char *desc; 273 struct key *rkey; 274 ssize_t ret; 275 276 ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc); 277 if (ret <= 0) 278 return ERR_PTR(ret); 279 280 rkey = request_key(&key_type_id_resolver, desc, ""); 281 if (IS_ERR(rkey)) { 282 mutex_lock(&idmap->idmap_mutex); 283 rkey = request_key_with_auxdata(&key_type_id_resolver_legacy, 284 desc, "", 0, idmap); 285 mutex_unlock(&idmap->idmap_mutex); 286 } 287 if (!IS_ERR(rkey)) 288 set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags); 289 290 kfree(desc); 291 return rkey; 292} 293 294static ssize_t nfs_idmap_get_key(const char *name, size_t namelen, 295 const char *type, void *data, 296 size_t data_size, struct idmap *idmap) 297{ 298 const struct cred *saved_cred; 299 struct key *rkey; 300 const struct user_key_payload *payload; 301 ssize_t ret; 302 303 saved_cred = override_creds(id_resolver_cache); 304 rkey = nfs_idmap_request_key(name, namelen, type, idmap); 305 revert_creds(saved_cred); 306 307 if (IS_ERR(rkey)) { 308 ret = PTR_ERR(rkey); 309 goto out; 310 } 311 312 rcu_read_lock(); 313 rkey->perm |= KEY_USR_VIEW; 314 315 ret = key_validate(rkey); 316 if (ret < 0) 317 goto out_up; 318 319 payload = user_key_payload(rkey); 320 if (IS_ERR_OR_NULL(payload)) { 321 ret = PTR_ERR(payload); 322 goto out_up; 323 } 324 325 ret = payload->datalen; 326 if (ret > 0 && ret <= data_size) 327 memcpy(data, payload->data, ret); 328 else 329 ret = -EINVAL; 330 331out_up: 332 rcu_read_unlock(); 333 key_put(rkey); 334out: 335 return ret; 336} 337 338/* ID -> Name */ 339static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf, 340 size_t buflen, struct idmap *idmap) 341{ 342 char id_str[NFS_UINT_MAXLEN]; 343 int id_len; 344 ssize_t ret; 345 346 id_len = snprintf(id_str, sizeof(id_str), "%u", id); 347 ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap); 348 if (ret < 0) 349 return -EINVAL; 350 return ret; 351} 352 353/* Name -> ID */ 354static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type, 355 __u32 *id, struct idmap *idmap) 356{ 357 char id_str[NFS_UINT_MAXLEN]; 358 long id_long; 359 ssize_t data_size; 360 int ret = 0; 361 362 data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap); 363 if (data_size <= 0) { 364 ret = -EINVAL; 365 } else { 366 ret = kstrtol(id_str, 10, &id_long); 367 *id = (__u32)id_long; 368 } 369 return ret; 370} 371 372/* idmap classic begins here */ 373 374enum { 375 Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err 376}; 377 378static const match_table_t nfs_idmap_tokens = { 379 { Opt_find_uid, "uid:%s" }, 380 { Opt_find_gid, "gid:%s" }, 381 { Opt_find_user, "user:%s" }, 382 { Opt_find_group, "group:%s" }, 383 { Opt_find_err, NULL } 384}; 385 386static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *); 387static ssize_t idmap_pipe_downcall(struct file *, const char __user *, 388 size_t); 389static void idmap_release_pipe(struct inode *); 390static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); 391 392static const struct rpc_pipe_ops idmap_upcall_ops = { 393 .upcall = rpc_pipe_generic_upcall, 394 .downcall = idmap_pipe_downcall, 395 .release_pipe = idmap_release_pipe, 396 .destroy_msg = idmap_pipe_destroy_msg, 397}; 398 399static struct key_type key_type_id_resolver_legacy = { 400 .name = "id_legacy", 401 .preparse = user_preparse, 402 .free_preparse = user_free_preparse, 403 .instantiate = generic_key_instantiate, 404 .revoke = user_revoke, 405 .destroy = user_destroy, 406 .describe = user_describe, 407 .read = user_read, 408 .request_key = nfs_idmap_legacy_upcall, 409}; 410 411static void nfs_idmap_pipe_destroy(struct dentry *dir, 412 struct rpc_pipe_dir_object *pdo) 413{ 414 struct idmap *idmap = pdo->pdo_data; 415 struct rpc_pipe *pipe = idmap->idmap_pipe; 416 417 if (pipe->dentry) { 418 rpc_unlink(pipe->dentry); 419 pipe->dentry = NULL; 420 } 421} 422 423static int nfs_idmap_pipe_create(struct dentry *dir, 424 struct rpc_pipe_dir_object *pdo) 425{ 426 struct idmap *idmap = pdo->pdo_data; 427 struct rpc_pipe *pipe = idmap->idmap_pipe; 428 struct dentry *dentry; 429 430 dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe); 431 if (IS_ERR(dentry)) 432 return PTR_ERR(dentry); 433 pipe->dentry = dentry; 434 return 0; 435} 436 437static const struct rpc_pipe_dir_object_ops nfs_idmap_pipe_dir_object_ops = { 438 .create = nfs_idmap_pipe_create, 439 .destroy = nfs_idmap_pipe_destroy, 440}; 441 442int 443nfs_idmap_new(struct nfs_client *clp) 444{ 445 struct idmap *idmap; 446 struct rpc_pipe *pipe; 447 int error; 448 449 idmap = kzalloc(sizeof(*idmap), GFP_KERNEL); 450 if (idmap == NULL) 451 return -ENOMEM; 452 453 rpc_init_pipe_dir_object(&idmap->idmap_pdo, 454 &nfs_idmap_pipe_dir_object_ops, 455 idmap); 456 457 pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0); 458 if (IS_ERR(pipe)) { 459 error = PTR_ERR(pipe); 460 goto err; 461 } 462 idmap->idmap_pipe = pipe; 463 mutex_init(&idmap->idmap_mutex); 464 465 error = rpc_add_pipe_dir_object(clp->cl_net, 466 &clp->cl_rpcclient->cl_pipedir_objects, 467 &idmap->idmap_pdo); 468 if (error) 469 goto err_destroy_pipe; 470 471 clp->cl_idmap = idmap; 472 return 0; 473err_destroy_pipe: 474 rpc_destroy_pipe_data(idmap->idmap_pipe); 475err: 476 kfree(idmap); 477 return error; 478} 479 480void 481nfs_idmap_delete(struct nfs_client *clp) 482{ 483 struct idmap *idmap = clp->cl_idmap; 484 485 if (!idmap) 486 return; 487 clp->cl_idmap = NULL; 488 rpc_remove_pipe_dir_object(clp->cl_net, 489 &clp->cl_rpcclient->cl_pipedir_objects, 490 &idmap->idmap_pdo); 491 rpc_destroy_pipe_data(idmap->idmap_pipe); 492 kfree(idmap); 493} 494 495static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap, 496 struct idmap_msg *im, 497 struct rpc_pipe_msg *msg) 498{ 499 substring_t substr; 500 int token, ret; 501 502 im->im_type = IDMAP_TYPE_GROUP; 503 token = match_token(desc, nfs_idmap_tokens, &substr); 504 505 switch (token) { 506 case Opt_find_uid: 507 im->im_type = IDMAP_TYPE_USER; 508 case Opt_find_gid: 509 im->im_conv = IDMAP_CONV_NAMETOID; 510 ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ); 511 break; 512 513 case Opt_find_user: 514 im->im_type = IDMAP_TYPE_USER; 515 case Opt_find_group: 516 im->im_conv = IDMAP_CONV_IDTONAME; 517 ret = match_int(&substr, &im->im_id); 518 break; 519 520 default: 521 ret = -EINVAL; 522 goto out; 523 } 524 525 msg->data = im; 526 msg->len = sizeof(struct idmap_msg); 527 528out: 529 return ret; 530} 531 532static bool 533nfs_idmap_prepare_pipe_upcall(struct idmap *idmap, 534 struct idmap_legacy_upcalldata *data) 535{ 536 if (idmap->idmap_upcall_data != NULL) { 537 WARN_ON_ONCE(1); 538 return false; 539 } 540 idmap->idmap_upcall_data = data; 541 return true; 542} 543 544static void 545nfs_idmap_complete_pipe_upcall_locked(struct idmap *idmap, int ret) 546{ 547 struct key_construction *cons = idmap->idmap_upcall_data->key_cons; 548 549 kfree(idmap->idmap_upcall_data); 550 idmap->idmap_upcall_data = NULL; 551 complete_request_key(cons, ret); 552} 553 554static void 555nfs_idmap_abort_pipe_upcall(struct idmap *idmap, int ret) 556{ 557 if (idmap->idmap_upcall_data != NULL) 558 nfs_idmap_complete_pipe_upcall_locked(idmap, ret); 559} 560 561static int nfs_idmap_legacy_upcall(struct key_construction *cons, 562 const char *op, 563 void *aux) 564{ 565 struct idmap_legacy_upcalldata *data; 566 struct rpc_pipe_msg *msg; 567 struct idmap_msg *im; 568 struct idmap *idmap = (struct idmap *)aux; 569 struct key *key = cons->key; 570 int ret = -ENOMEM; 571 572 /* msg and im are freed in idmap_pipe_destroy_msg */ 573 data = kzalloc(sizeof(*data), GFP_KERNEL); 574 if (!data) 575 goto out1; 576 577 msg = &data->pipe_msg; 578 im = &data->idmap_msg; 579 data->idmap = idmap; 580 data->key_cons = cons; 581 582 ret = nfs_idmap_prepare_message(key->description, idmap, im, msg); 583 if (ret < 0) 584 goto out2; 585 586 ret = -EAGAIN; 587 if (!nfs_idmap_prepare_pipe_upcall(idmap, data)) 588 goto out2; 589 590 ret = rpc_queue_upcall(idmap->idmap_pipe, msg); 591 if (ret < 0) 592 nfs_idmap_abort_pipe_upcall(idmap, ret); 593 594 return ret; 595out2: 596 kfree(data); 597out1: 598 complete_request_key(cons, ret); 599 return ret; 600} 601 602static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen) 603{ 604 return key_instantiate_and_link(key, data, datalen, 605 id_resolver_cache->thread_keyring, 606 authkey); 607} 608 609static int nfs_idmap_read_and_verify_message(struct idmap_msg *im, 610 struct idmap_msg *upcall, 611 struct key *key, struct key *authkey) 612{ 613 char id_str[NFS_UINT_MAXLEN]; 614 size_t len; 615 int ret = -ENOKEY; 616 617 /* ret = -ENOKEY */ 618 if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv) 619 goto out; 620 switch (im->im_conv) { 621 case IDMAP_CONV_NAMETOID: 622 if (strcmp(upcall->im_name, im->im_name) != 0) 623 break; 624 /* Note: here we store the NUL terminator too */ 625 len = sprintf(id_str, "%d", im->im_id) + 1; 626 ret = nfs_idmap_instantiate(key, authkey, id_str, len); 627 break; 628 case IDMAP_CONV_IDTONAME: 629 if (upcall->im_id != im->im_id) 630 break; 631 len = strlen(im->im_name); 632 ret = nfs_idmap_instantiate(key, authkey, im->im_name, len); 633 break; 634 default: 635 ret = -EINVAL; 636 } 637out: 638 return ret; 639} 640 641static ssize_t 642idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 643{ 644 struct rpc_inode *rpci = RPC_I(file_inode(filp)); 645 struct idmap *idmap = (struct idmap *)rpci->private; 646 struct key_construction *cons; 647 struct idmap_msg im; 648 size_t namelen_in; 649 int ret = -ENOKEY; 650 651 /* If instantiation is successful, anyone waiting for key construction 652 * will have been woken up and someone else may now have used 653 * idmap_key_cons - so after this point we may no longer touch it. 654 */ 655 if (idmap->idmap_upcall_data == NULL) 656 goto out_noupcall; 657 658 cons = idmap->idmap_upcall_data->key_cons; 659 660 if (mlen != sizeof(im)) { 661 ret = -ENOSPC; 662 goto out; 663 } 664 665 if (copy_from_user(&im, src, mlen) != 0) { 666 ret = -EFAULT; 667 goto out; 668 } 669 670 if (!(im.im_status & IDMAP_STATUS_SUCCESS)) { 671 ret = -ENOKEY; 672 goto out; 673 } 674 675 namelen_in = strnlen(im.im_name, IDMAP_NAMESZ); 676 if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) { 677 ret = -EINVAL; 678 goto out; 679} 680 681 ret = nfs_idmap_read_and_verify_message(&im, 682 &idmap->idmap_upcall_data->idmap_msg, 683 cons->key, cons->authkey); 684 if (ret >= 0) { 685 key_set_timeout(cons->key, nfs_idmap_cache_timeout); 686 ret = mlen; 687 } 688 689out: 690 nfs_idmap_complete_pipe_upcall_locked(idmap, ret); 691out_noupcall: 692 return ret; 693} 694 695static void 696idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) 697{ 698 struct idmap_legacy_upcalldata *data = container_of(msg, 699 struct idmap_legacy_upcalldata, 700 pipe_msg); 701 struct idmap *idmap = data->idmap; 702 703 if (msg->errno) 704 nfs_idmap_abort_pipe_upcall(idmap, msg->errno); 705} 706 707static void 708idmap_release_pipe(struct inode *inode) 709{ 710 struct rpc_inode *rpci = RPC_I(inode); 711 struct idmap *idmap = (struct idmap *)rpci->private; 712 713 nfs_idmap_abort_pipe_upcall(idmap, -EPIPE); 714} 715 716int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid) 717{ 718 struct idmap *idmap = server->nfs_client->cl_idmap; 719 __u32 id = -1; 720 int ret = 0; 721 722 if (!nfs_map_string_to_numeric(name, namelen, &id)) 723 ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap); 724 if (ret == 0) { 725 *uid = make_kuid(&init_user_ns, id); 726 if (!uid_valid(*uid)) 727 ret = -ERANGE; 728 } 729 trace_nfs4_map_name_to_uid(name, namelen, id, ret); 730 return ret; 731} 732 733int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid) 734{ 735 struct idmap *idmap = server->nfs_client->cl_idmap; 736 __u32 id = -1; 737 int ret = 0; 738 739 if (!nfs_map_string_to_numeric(name, namelen, &id)) 740 ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap); 741 if (ret == 0) { 742 *gid = make_kgid(&init_user_ns, id); 743 if (!gid_valid(*gid)) 744 ret = -ERANGE; 745 } 746 trace_nfs4_map_group_to_gid(name, namelen, id, ret); 747 return ret; 748} 749 750int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen) 751{ 752 struct idmap *idmap = server->nfs_client->cl_idmap; 753 int ret = -EINVAL; 754 __u32 id; 755 756 id = from_kuid(&init_user_ns, uid); 757 if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) 758 ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap); 759 if (ret < 0) 760 ret = nfs_map_numeric_to_string(id, buf, buflen); 761 trace_nfs4_map_uid_to_name(buf, ret, id, ret); 762 return ret; 763} 764int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen) 765{ 766 struct idmap *idmap = server->nfs_client->cl_idmap; 767 int ret = -EINVAL; 768 __u32 id; 769 770 id = from_kgid(&init_user_ns, gid); 771 if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) 772 ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap); 773 if (ret < 0) 774 ret = nfs_map_numeric_to_string(id, buf, buflen); 775 trace_nfs4_map_gid_to_group(buf, ret, id, ret); 776 return ret; 777} 778