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 <keys/request_key_auth-type.h> 48 #include <linux/module.h> 49 #include <linux/user_namespace.h> 50 51 #include "internal.h" 52 #include "netns.h" 53 #include "nfs4idmap.h" 54 #include "nfs4trace.h" 55 56 #define NFS_UINT_MAXLEN 11 57 58 static const struct cred *id_resolver_cache; 59 static struct key_type key_type_id_resolver_legacy; 60 61 struct idmap_legacy_upcalldata { 62 struct rpc_pipe_msg pipe_msg; 63 struct idmap_msg idmap_msg; 64 struct key *authkey; 65 struct idmap *idmap; 66 }; 67 68 struct idmap { 69 struct rpc_pipe_dir_object idmap_pdo; 70 struct rpc_pipe *idmap_pipe; 71 struct idmap_legacy_upcalldata *idmap_upcall_data; 72 struct mutex idmap_mutex; 73 struct user_namespace *user_ns; 74 }; 75 76 static struct user_namespace *idmap_userns(const struct idmap *idmap) 77 { 78 if (idmap && idmap->user_ns) 79 return idmap->user_ns; 80 return &init_user_ns; 81 } 82 83 /** 84 * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields 85 * @fattr: fully initialised struct nfs_fattr 86 * @owner_name: owner name string cache 87 * @group_name: group name string cache 88 */ 89 void nfs_fattr_init_names(struct nfs_fattr *fattr, 90 struct nfs4_string *owner_name, 91 struct nfs4_string *group_name) 92 { 93 fattr->owner_name = owner_name; 94 fattr->group_name = group_name; 95 } 96 97 static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr) 98 { 99 fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME; 100 kfree(fattr->owner_name->data); 101 } 102 103 static void nfs_fattr_free_group_name(struct nfs_fattr *fattr) 104 { 105 fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME; 106 kfree(fattr->group_name->data); 107 } 108 109 static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr) 110 { 111 struct nfs4_string *owner = fattr->owner_name; 112 kuid_t uid; 113 114 if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)) 115 return false; 116 if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) { 117 fattr->uid = uid; 118 fattr->valid |= NFS_ATTR_FATTR_OWNER; 119 } 120 return true; 121 } 122 123 static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr) 124 { 125 struct nfs4_string *group = fattr->group_name; 126 kgid_t gid; 127 128 if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)) 129 return false; 130 if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) { 131 fattr->gid = gid; 132 fattr->valid |= NFS_ATTR_FATTR_GROUP; 133 } 134 return true; 135 } 136 137 /** 138 * nfs_fattr_free_names - free up the NFSv4 owner and group strings 139 * @fattr: a fully initialised nfs_fattr structure 140 */ 141 void nfs_fattr_free_names(struct nfs_fattr *fattr) 142 { 143 if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME) 144 nfs_fattr_free_owner_name(fattr); 145 if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME) 146 nfs_fattr_free_group_name(fattr); 147 } 148 149 /** 150 * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free 151 * @server: pointer to the filesystem nfs_server structure 152 * @fattr: a fully initialised nfs_fattr structure 153 * 154 * This helper maps the cached NFSv4 owner/group strings in fattr into 155 * their numeric uid/gid equivalents, and then frees the cached strings. 156 */ 157 void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr) 158 { 159 if (nfs_fattr_map_owner_name(server, fattr)) 160 nfs_fattr_free_owner_name(fattr); 161 if (nfs_fattr_map_group_name(server, fattr)) 162 nfs_fattr_free_group_name(fattr); 163 } 164 165 int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res) 166 { 167 unsigned long val; 168 char buf[16]; 169 170 if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf)) 171 return 0; 172 memcpy(buf, name, namelen); 173 buf[namelen] = '\0'; 174 if (kstrtoul(buf, 0, &val) != 0) 175 return 0; 176 *res = val; 177 return 1; 178 } 179 EXPORT_SYMBOL_GPL(nfs_map_string_to_numeric); 180 181 static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen) 182 { 183 return snprintf(buf, buflen, "%u", id); 184 } 185 186 static struct key_type key_type_id_resolver = { 187 .name = "id_resolver", 188 .preparse = user_preparse, 189 .free_preparse = user_free_preparse, 190 .instantiate = generic_key_instantiate, 191 .revoke = user_revoke, 192 .destroy = user_destroy, 193 .describe = user_describe, 194 .read = user_read, 195 }; 196 197 int nfs_idmap_init(void) 198 { 199 struct cred *cred; 200 struct key *keyring; 201 int ret = 0; 202 203 printk(KERN_NOTICE "NFS: Registering the %s key type\n", 204 key_type_id_resolver.name); 205 206 cred = prepare_kernel_cred(&init_task); 207 if (!cred) 208 return -ENOMEM; 209 210 keyring = keyring_alloc(".id_resolver", 211 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, 212 (KEY_POS_ALL & ~KEY_POS_SETATTR) | 213 KEY_USR_VIEW | KEY_USR_READ, 214 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); 215 if (IS_ERR(keyring)) { 216 ret = PTR_ERR(keyring); 217 goto failed_put_cred; 218 } 219 220 ret = register_key_type(&key_type_id_resolver); 221 if (ret < 0) 222 goto failed_put_key; 223 224 ret = register_key_type(&key_type_id_resolver_legacy); 225 if (ret < 0) 226 goto failed_reg_legacy; 227 228 set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); 229 cred->thread_keyring = keyring; 230 cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; 231 id_resolver_cache = cred; 232 return 0; 233 234 failed_reg_legacy: 235 unregister_key_type(&key_type_id_resolver); 236 failed_put_key: 237 key_put(keyring); 238 failed_put_cred: 239 put_cred(cred); 240 return ret; 241 } 242 243 void nfs_idmap_quit(void) 244 { 245 key_revoke(id_resolver_cache->thread_keyring); 246 unregister_key_type(&key_type_id_resolver); 247 unregister_key_type(&key_type_id_resolver_legacy); 248 put_cred(id_resolver_cache); 249 } 250 251 /* 252 * Assemble the description to pass to request_key() 253 * This function will allocate a new string and update dest to point 254 * at it. The caller is responsible for freeing dest. 255 * 256 * On error 0 is returned. Otherwise, the length of dest is returned. 257 */ 258 static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen, 259 const char *type, size_t typelen, char **desc) 260 { 261 char *cp; 262 size_t desclen = typelen + namelen + 2; 263 264 *desc = kmalloc(desclen, GFP_KERNEL); 265 if (!*desc) 266 return -ENOMEM; 267 268 cp = *desc; 269 memcpy(cp, type, typelen); 270 cp += typelen; 271 *cp++ = ':'; 272 273 memcpy(cp, name, namelen); 274 cp += namelen; 275 *cp = '\0'; 276 return desclen; 277 } 278 279 static struct key *nfs_idmap_request_key(const char *name, size_t namelen, 280 const char *type, struct idmap *idmap) 281 { 282 char *desc; 283 struct key *rkey = ERR_PTR(-EAGAIN); 284 ssize_t ret; 285 286 ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc); 287 if (ret < 0) 288 return ERR_PTR(ret); 289 290 if (!idmap->user_ns || idmap->user_ns == &init_user_ns) 291 rkey = request_key(&key_type_id_resolver, desc, ""); 292 if (IS_ERR(rkey)) { 293 mutex_lock(&idmap->idmap_mutex); 294 rkey = request_key_with_auxdata(&key_type_id_resolver_legacy, 295 desc, NULL, "", 0, idmap); 296 mutex_unlock(&idmap->idmap_mutex); 297 } 298 if (!IS_ERR(rkey)) 299 set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags); 300 301 kfree(desc); 302 return rkey; 303 } 304 305 static ssize_t nfs_idmap_get_key(const char *name, size_t namelen, 306 const char *type, void *data, 307 size_t data_size, struct idmap *idmap) 308 { 309 struct key *rkey; 310 const struct user_key_payload *payload; 311 ssize_t ret; 312 313 scoped_with_creds(id_resolver_cache) 314 rkey = nfs_idmap_request_key(name, namelen, type, idmap); 315 if (IS_ERR(rkey)) { 316 ret = PTR_ERR(rkey); 317 goto out; 318 } 319 320 rcu_read_lock(); 321 rkey->perm |= KEY_USR_VIEW; 322 323 ret = key_validate(rkey); 324 if (ret < 0) 325 goto out_up; 326 327 payload = user_key_payload_rcu(rkey); 328 if (IS_ERR_OR_NULL(payload)) { 329 ret = PTR_ERR(payload); 330 goto out_up; 331 } 332 333 ret = payload->datalen; 334 if (ret > 0 && ret <= data_size) 335 memcpy(data, payload->data, ret); 336 else 337 ret = -EINVAL; 338 339 out_up: 340 rcu_read_unlock(); 341 key_put(rkey); 342 out: 343 return ret; 344 } 345 346 /* ID -> Name */ 347 static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf, 348 size_t buflen, struct idmap *idmap) 349 { 350 char id_str[NFS_UINT_MAXLEN]; 351 int id_len; 352 ssize_t ret; 353 354 id_len = nfs_map_numeric_to_string(id, id_str, sizeof(id_str)); 355 ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap); 356 if (ret < 0) 357 return -EINVAL; 358 return ret; 359 } 360 361 /* Name -> ID */ 362 static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type, 363 __u32 *id, struct idmap *idmap) 364 { 365 char id_str[NFS_UINT_MAXLEN]; 366 long id_long; 367 ssize_t data_size; 368 int ret = 0; 369 370 data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap); 371 if (data_size <= 0) { 372 ret = -EINVAL; 373 } else { 374 ret = kstrtol(id_str, 10, &id_long); 375 if (!ret) 376 *id = (__u32)id_long; 377 } 378 return ret; 379 } 380 381 /* idmap classic begins here */ 382 383 enum { 384 Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err 385 }; 386 387 static const match_table_t nfs_idmap_tokens = { 388 { Opt_find_uid, "uid:%s" }, 389 { Opt_find_gid, "gid:%s" }, 390 { Opt_find_user, "user:%s" }, 391 { Opt_find_group, "group:%s" }, 392 { Opt_find_err, NULL } 393 }; 394 395 static int nfs_idmap_legacy_upcall(struct key *, void *); 396 static ssize_t idmap_pipe_downcall(struct file *, const char __user *, 397 size_t); 398 static void idmap_release_pipe(struct inode *); 399 static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); 400 401 static const struct rpc_pipe_ops idmap_upcall_ops = { 402 .upcall = rpc_pipe_generic_upcall, 403 .downcall = idmap_pipe_downcall, 404 .release_pipe = idmap_release_pipe, 405 .destroy_msg = idmap_pipe_destroy_msg, 406 }; 407 408 static struct key_type key_type_id_resolver_legacy = { 409 .name = "id_legacy", 410 .preparse = user_preparse, 411 .free_preparse = user_free_preparse, 412 .instantiate = generic_key_instantiate, 413 .revoke = user_revoke, 414 .destroy = user_destroy, 415 .describe = user_describe, 416 .read = user_read, 417 .request_key = nfs_idmap_legacy_upcall, 418 }; 419 420 static void nfs_idmap_pipe_destroy(struct dentry *dir, 421 struct rpc_pipe_dir_object *pdo) 422 { 423 struct idmap *idmap = pdo->pdo_data; 424 425 rpc_unlink(idmap->idmap_pipe); 426 } 427 428 static int nfs_idmap_pipe_create(struct dentry *dir, 429 struct rpc_pipe_dir_object *pdo) 430 { 431 struct idmap *idmap = pdo->pdo_data; 432 433 return rpc_mkpipe_dentry(dir, "idmap", idmap, idmap->idmap_pipe); 434 } 435 436 static const struct rpc_pipe_dir_object_ops nfs_idmap_pipe_dir_object_ops = { 437 .create = nfs_idmap_pipe_create, 438 .destroy = nfs_idmap_pipe_destroy, 439 }; 440 441 int 442 nfs_idmap_new(struct nfs_client *clp) 443 { 444 struct idmap *idmap; 445 struct rpc_pipe *pipe; 446 int error; 447 448 idmap = kzalloc(sizeof(*idmap), GFP_KERNEL); 449 if (idmap == NULL) 450 return -ENOMEM; 451 452 mutex_init(&idmap->idmap_mutex); 453 idmap->user_ns = get_user_ns(clp->cl_rpcclient->cl_cred->user_ns); 454 455 rpc_init_pipe_dir_object(&idmap->idmap_pdo, 456 &nfs_idmap_pipe_dir_object_ops, 457 idmap); 458 459 pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0); 460 if (IS_ERR(pipe)) { 461 error = PTR_ERR(pipe); 462 goto err; 463 } 464 idmap->idmap_pipe = pipe; 465 466 error = rpc_add_pipe_dir_object(clp->cl_net, 467 &clp->cl_rpcclient->cl_pipedir_objects, 468 &idmap->idmap_pdo); 469 if (error) 470 goto err_destroy_pipe; 471 472 clp->cl_idmap = idmap; 473 return 0; 474 err_destroy_pipe: 475 rpc_destroy_pipe_data(idmap->idmap_pipe); 476 err: 477 put_user_ns(idmap->user_ns); 478 kfree(idmap); 479 return error; 480 } 481 482 void 483 nfs_idmap_delete(struct nfs_client *clp) 484 { 485 struct idmap *idmap = clp->cl_idmap; 486 487 if (!idmap) 488 return; 489 clp->cl_idmap = NULL; 490 rpc_remove_pipe_dir_object(clp->cl_net, 491 &clp->cl_rpcclient->cl_pipedir_objects, 492 &idmap->idmap_pdo); 493 rpc_destroy_pipe_data(idmap->idmap_pipe); 494 put_user_ns(idmap->user_ns); 495 kfree(idmap); 496 } 497 498 static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap, 499 struct idmap_msg *im, 500 struct rpc_pipe_msg *msg) 501 { 502 substring_t substr; 503 int token, ret; 504 505 im->im_type = IDMAP_TYPE_GROUP; 506 token = match_token(desc, nfs_idmap_tokens, &substr); 507 508 switch (token) { 509 case Opt_find_uid: 510 im->im_type = IDMAP_TYPE_USER; 511 fallthrough; 512 case Opt_find_gid: 513 im->im_conv = IDMAP_CONV_NAMETOID; 514 ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ); 515 break; 516 517 case Opt_find_user: 518 im->im_type = IDMAP_TYPE_USER; 519 fallthrough; 520 case Opt_find_group: 521 im->im_conv = IDMAP_CONV_IDTONAME; 522 ret = match_int(&substr, &im->im_id); 523 if (ret) 524 goto out; 525 break; 526 527 default: 528 ret = -EINVAL; 529 goto out; 530 } 531 532 msg->data = im; 533 msg->len = sizeof(struct idmap_msg); 534 535 out: 536 return ret; 537 } 538 539 static bool 540 nfs_idmap_prepare_pipe_upcall(struct idmap *idmap, 541 struct idmap_legacy_upcalldata *data) 542 { 543 if (idmap->idmap_upcall_data != NULL) { 544 WARN_ON_ONCE(1); 545 return false; 546 } 547 idmap->idmap_upcall_data = data; 548 return true; 549 } 550 551 static void nfs_idmap_complete_pipe_upcall(struct idmap_legacy_upcalldata *data, 552 int ret) 553 { 554 complete_request_key(data->authkey, ret); 555 key_put(data->authkey); 556 kfree(data); 557 } 558 559 static void nfs_idmap_abort_pipe_upcall(struct idmap *idmap, 560 struct idmap_legacy_upcalldata *data, 561 int ret) 562 { 563 if (cmpxchg(&idmap->idmap_upcall_data, data, NULL) == data) 564 nfs_idmap_complete_pipe_upcall(data, ret); 565 } 566 567 static int nfs_idmap_legacy_upcall(struct key *authkey, void *aux) 568 { 569 struct idmap_legacy_upcalldata *data; 570 struct request_key_auth *rka = get_request_key_auth(authkey); 571 struct rpc_pipe_msg *msg; 572 struct idmap_msg *im; 573 struct idmap *idmap = aux; 574 struct key *key = rka->target_key; 575 int ret = -ENOKEY; 576 577 if (!aux) 578 goto out1; 579 580 /* msg and im are freed in idmap_pipe_destroy_msg */ 581 ret = -ENOMEM; 582 data = kzalloc(sizeof(*data), GFP_KERNEL); 583 if (!data) 584 goto out1; 585 586 msg = &data->pipe_msg; 587 im = &data->idmap_msg; 588 data->idmap = idmap; 589 data->authkey = key_get(authkey); 590 591 ret = nfs_idmap_prepare_message(key->description, idmap, im, msg); 592 if (ret < 0) 593 goto out2; 594 595 ret = -EAGAIN; 596 if (!nfs_idmap_prepare_pipe_upcall(idmap, data)) 597 goto out2; 598 599 ret = rpc_queue_upcall(idmap->idmap_pipe, msg); 600 if (ret < 0) 601 nfs_idmap_abort_pipe_upcall(idmap, data, ret); 602 603 return ret; 604 out2: 605 kfree(data); 606 out1: 607 complete_request_key(authkey, ret); 608 return ret; 609 } 610 611 static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen) 612 { 613 return key_instantiate_and_link(key, data, datalen, 614 id_resolver_cache->thread_keyring, 615 authkey); 616 } 617 618 static int nfs_idmap_read_and_verify_message(struct idmap_msg *im, 619 struct idmap_msg *upcall, 620 struct key *key, struct key *authkey) 621 { 622 char id_str[NFS_UINT_MAXLEN]; 623 size_t len; 624 int ret = -ENOKEY; 625 626 /* ret = -ENOKEY */ 627 if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv) 628 goto out; 629 switch (im->im_conv) { 630 case IDMAP_CONV_NAMETOID: 631 if (strcmp(upcall->im_name, im->im_name) != 0) 632 break; 633 /* Note: here we store the NUL terminator too */ 634 len = 1 + nfs_map_numeric_to_string(im->im_id, id_str, 635 sizeof(id_str)); 636 ret = nfs_idmap_instantiate(key, authkey, id_str, len); 637 break; 638 case IDMAP_CONV_IDTONAME: 639 if (upcall->im_id != im->im_id) 640 break; 641 len = strlen(im->im_name); 642 ret = nfs_idmap_instantiate(key, authkey, im->im_name, len); 643 break; 644 default: 645 ret = -EINVAL; 646 } 647 out: 648 return ret; 649 } 650 651 static ssize_t 652 idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) 653 { 654 struct request_key_auth *rka; 655 struct rpc_inode *rpci = RPC_I(file_inode(filp)); 656 struct idmap *idmap = (struct idmap *)rpci->private; 657 struct idmap_legacy_upcalldata *data; 658 struct key *authkey; 659 struct idmap_msg im; 660 size_t namelen_in; 661 int ret = -ENOKEY; 662 663 /* If instantiation is successful, anyone waiting for key construction 664 * will have been woken up and someone else may now have used 665 * idmap_key_cons - so after this point we may no longer touch it. 666 */ 667 data = xchg(&idmap->idmap_upcall_data, NULL); 668 if (data == NULL) 669 goto out_noupcall; 670 671 authkey = data->authkey; 672 rka = get_request_key_auth(authkey); 673 674 if (mlen != sizeof(im)) { 675 ret = -ENOSPC; 676 goto out; 677 } 678 679 if (copy_from_user(&im, src, mlen) != 0) { 680 ret = -EFAULT; 681 goto out; 682 } 683 684 if (!(im.im_status & IDMAP_STATUS_SUCCESS)) { 685 ret = -ENOKEY; 686 goto out; 687 } 688 689 namelen_in = strnlen(im.im_name, IDMAP_NAMESZ); 690 if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) { 691 ret = -EINVAL; 692 goto out; 693 } 694 695 ret = nfs_idmap_read_and_verify_message(&im, &data->idmap_msg, 696 rka->target_key, authkey); 697 if (ret >= 0) { 698 key_set_timeout(rka->target_key, nfs_idmap_cache_timeout); 699 ret = mlen; 700 } 701 702 out: 703 nfs_idmap_complete_pipe_upcall(data, ret); 704 out_noupcall: 705 return ret; 706 } 707 708 static void 709 idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) 710 { 711 struct idmap_legacy_upcalldata *data = container_of(msg, 712 struct idmap_legacy_upcalldata, 713 pipe_msg); 714 struct idmap *idmap = data->idmap; 715 716 if (msg->errno) 717 nfs_idmap_abort_pipe_upcall(idmap, data, msg->errno); 718 } 719 720 static void 721 idmap_release_pipe(struct inode *inode) 722 { 723 struct rpc_inode *rpci = RPC_I(inode); 724 struct idmap *idmap = (struct idmap *)rpci->private; 725 struct idmap_legacy_upcalldata *data; 726 727 data = xchg(&idmap->idmap_upcall_data, NULL); 728 if (data) 729 nfs_idmap_complete_pipe_upcall(data, -EPIPE); 730 } 731 732 int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid) 733 { 734 struct idmap *idmap = server->nfs_client->cl_idmap; 735 __u32 id = -1; 736 int ret = 0; 737 738 if (!nfs_map_string_to_numeric(name, namelen, &id)) 739 ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap); 740 if (ret == 0) { 741 *uid = make_kuid(idmap_userns(idmap), id); 742 if (!uid_valid(*uid)) 743 ret = -ERANGE; 744 } 745 trace_nfs4_map_name_to_uid(name, namelen, id, ret); 746 return ret; 747 } 748 749 int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid) 750 { 751 struct idmap *idmap = server->nfs_client->cl_idmap; 752 __u32 id = -1; 753 int ret = 0; 754 755 if (!nfs_map_string_to_numeric(name, namelen, &id)) 756 ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap); 757 if (ret == 0) { 758 *gid = make_kgid(idmap_userns(idmap), id); 759 if (!gid_valid(*gid)) 760 ret = -ERANGE; 761 } 762 trace_nfs4_map_group_to_gid(name, namelen, id, ret); 763 return ret; 764 } 765 766 int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen) 767 { 768 struct idmap *idmap = server->nfs_client->cl_idmap; 769 int ret = -EINVAL; 770 __u32 id; 771 772 id = from_kuid_munged(idmap_userns(idmap), uid); 773 if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) 774 ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap); 775 if (ret < 0) 776 ret = nfs_map_numeric_to_string(id, buf, buflen); 777 trace_nfs4_map_uid_to_name(buf, ret, id, ret); 778 return ret; 779 } 780 int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen) 781 { 782 struct idmap *idmap = server->nfs_client->cl_idmap; 783 int ret = -EINVAL; 784 __u32 id; 785 786 id = from_kgid_munged(idmap_userns(idmap), gid); 787 if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) 788 ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap); 789 if (ret < 0) 790 ret = nfs_map_numeric_to_string(id, buf, buflen); 791 trace_nfs4_map_gid_to_group(buf, ret, id, ret); 792 return ret; 793 } 794