1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2003 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #define DEBUG_SUBSYSTEM S_MDS
24 #include <linux/config.h>
25 #include <linux/module.h>
26 #include <linux/kernel.h>
28 #include <linux/string.h>
29 #include <linux/stat.h>
30 #include <linux/errno.h>
31 #include <linux/version.h>
32 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
33 # include <linux/locks.h> // for wait_on_buffer
35 # include <linux/buffer_head.h> // for wait_on_buffer
37 #include <linux/unistd.h>
39 #include <asm/system.h>
40 #include <asm/uaccess.h>
43 #include <linux/stat.h>
44 #include <asm/uaccess.h>
45 #include <linux/slab.h>
46 #include <asm/segment.h>
47 #include <linux/random.h>
49 #include <linux/obd_support.h>
50 #include <linux/lustre_lib.h>
51 #include <linux/lustre_sec.h>
52 #include <linux/lustre_ucache.h>
53 #include <linux/lustre_gs.h>
54 #include <linux/lustre_fsfilt.h>
55 #include "mds_internal.h"
57 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,4)
58 struct group_info *groups_alloc(int ngroups)
60 struct group_info *ginfo;
62 LASSERT(ngroups <= NGROUPS_SMALL);
64 OBD_ALLOC(ginfo, sizeof(*ginfo) + 1 * sizeof(gid_t *));
67 ginfo->ngroups = ngroups;
69 ginfo->blocks[0] = ginfo->small_block;
70 atomic_set(&ginfo->usage, 1);
75 void groups_free(struct group_info *ginfo)
77 LASSERT(ginfo->ngroups <= NGROUPS_SMALL);
78 LASSERT(ginfo->nblocks == 1);
79 LASSERT(ginfo->blocks[0] == ginfo->small_block);
81 OBD_FREE(ginfo, sizeof(*ginfo) + 1 * sizeof(gid_t *));
84 /* for 2.4 the group number is small, so simply search the
87 int groups_search(struct group_info *ginfo, gid_t grp)
94 for (i = 0; i < ginfo->ngroups; i++)
95 if (GROUP_AT(ginfo, i) == grp)
102 void groups_sort(struct group_info *ginfo)
104 int base, max, stride;
105 int gidsetsize = ginfo->ngroups;
107 for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1)
112 max = gidsetsize - stride;
113 for (base = 0; base < max; base++) {
115 int right = left + stride;
116 gid_t tmp = GROUP_AT(ginfo, right);
118 while (left >= 0 && GROUP_AT(ginfo, left) > tmp) {
119 GROUP_AT(ginfo, right) =
120 GROUP_AT(ginfo, left);
124 GROUP_AT(ginfo, right) = tmp;
130 int groups_search(struct group_info *ginfo, gid_t grp)
138 right = ginfo->ngroups;
139 while (left < right) {
140 int mid = (left + right) / 2;
141 int cmp = grp - GROUP_AT(ginfo, mid);
153 void groups_from_buffer(struct group_info *ginfo, __u32 *gids)
155 int i, ngroups = ginfo->ngroups;
157 for (i = 0; i < ginfo->nblocks; i++) {
158 int count = min(NGROUPS_PER_BLOCK, ngroups);
160 memcpy(ginfo->blocks[i], gids, count * sizeof(__u32));
161 gids += NGROUPS_PER_BLOCK;
166 void mds_pack_dentry2id(struct obd_device *obd,
167 struct lustre_id *id,
168 struct dentry *dentry,
171 id_ino(id) = dentry->d_inum;
172 id_gen(id) = dentry->d_generation;
175 id_fid(id) = dentry->d_fid;
176 id_group(id) = dentry->d_mdsnum;
180 void mds_pack_dentry2body(struct obd_device *obd,
182 struct dentry *dentry,
185 b->valid |= OBD_MD_FLID | OBD_MD_FLGENER |
189 b->valid |= OBD_MD_FID;
191 mds_pack_dentry2id(obd, &b->id1, dentry, fid);
194 int mds_pack_inode2id(struct obd_device *obd,
195 struct lustre_id *id,
203 /* we have to avoid deadlock. */
204 if (!down_trylock(&inode->i_sem)) {
205 rc = mds_read_inode_sid(obd, inode, id);
208 rc = mds_read_inode_sid(obd, inode, id);
213 id_ino(id) = inode->i_ino;
214 id_gen(id) = inode->i_generation;
215 id_type(id) = (S_IFMT & inode->i_mode);
220 void mds_inode2id(struct obd_device *obd, struct lustre_id *id,
221 struct inode *inode, __u64 fid)
223 struct mds_obd *mds = &obd->u.mds;
226 LASSERT(inode != NULL);
231 id_ino(id) = inode->i_ino;
232 id_group(id) = mds->mds_num;
233 id_gen(id) = inode->i_generation;
234 id_type(id) = (S_IFMT & inode->i_mode);
239 int mds_pack_gskey(struct obd_device *obd, struct lustre_msg *repmsg,
240 int *offset, struct mds_body *body, struct inode *inode)
242 struct mds_obd *mds = &obd->u.mds;
243 struct crypto_key_md *md_key;
244 struct crypto_key *ckey;
245 __u32 buflen, *sizep;
250 if ((mds->mds_crypto_type != MKS_TYPE &&
251 mds->mds_crypto_type != GKS_TYPE))
254 sizep = lustre_msg_buf(repmsg, (*offset)++, 4);
256 CERROR("can't locate returned ckey size buf\n");
259 *sizep = cpu_to_le32(sizeof(*ckey));
261 OBD_ALLOC(md_key, sizeof(*md_key));
263 buflen = repmsg->buflens[*offset];
264 buf = lustre_msg_buf(repmsg, (*offset)++, buflen);
266 size = fsfilt_get_md(obd, inode, md_key, sizeof(*md_key),
269 CERROR("Can not get gskey from MDS ino %lu rc %d\n",
271 GOTO(out, rc = size);
273 if (le32_to_cpu(md_key->md_magic) != MD_KEY_MAGIC) {
274 CDEBUG(D_INFO, "given match %x != magic %x\n",
275 md_key->md_magic, MD_KEY_MAGIC);
279 CDEBUG(D_INFO, "get key %s mac %s for ino %lu size %d \n",
280 md_key->md_ck.ck_key, md_key->md_ck.ck_mac, inode->i_ino, size);
281 ckey=(struct crypto_key*)buf;
283 memcpy(ckey, &md_key->md_ck, sizeof(*ckey));
284 body->valid |= OBD_MD_FLKEY;
286 OBD_FREE(md_key, sizeof(*md_key));
290 static int mds_get_gskey(struct inode *inode, struct crypto_key_md *mkey)
293 /*tmp create gs key here*/
294 get_random_bytes(mkey->md_ck.ck_key, KEY_SIZE);
295 mkey->md_ck.ck_type = MKS_TYPE;
299 int mds_set_gskey(struct obd_device *obd, void *handle,
300 struct inode *inode, void *key, int key_len,
303 struct crypto_key_md *md_key = NULL;
304 struct crypto_key *ckey = (struct crypto_key *)key;
305 struct mds_obd *mds = &obd->u.mds;
309 if ((mds->mds_crypto_type != MKS_TYPE &&
310 mds->mds_crypto_type != GKS_TYPE)) {
311 CDEBUG(D_INFO, "mds_crypto_type %d \n", mds->mds_crypto_type);
314 OBD_ALLOC(md_key, sizeof(*md_key));
315 if (mds->mds_crypto_type == MKS_TYPE) {
316 mds_get_gskey(inode, md_key);
318 LASSERT(ckey != NULL);
320 rc = fsfilt_get_md(obd, inode, md_key, sizeof(*md_key),
324 LASSERT(le32_to_cpu(md_key->md_magic) == MD_KEY_MAGIC ||
325 md_key->md_magic == 0);
326 if (le32_to_cpu(md_key->md_magic) == MD_KEY_MAGIC) {
327 CDEBUG(D_INFO, "reset key %s mac %s", md_key->md_ck.ck_mac,
328 md_key->md_ck.ck_key);
331 md_key->md_magic = cpu_to_le32(MD_KEY_MAGIC);
332 if (mds->mds_crypto_type == GKS_TYPE) {
333 /*get key and mac from request buffer*/
334 if (valid & ATTR_MAC) {
335 memcpy(md_key->md_ck.ck_mac, ckey->ck_mac, MAC_SIZE);
336 CDEBUG(D_INFO, "set mac %s for ino %lu \n",
337 md_key->md_ck.ck_mac, inode->i_ino);
339 if (valid & ATTR_KEY) {
340 memcpy(md_key->md_ck.ck_key, ckey->ck_key, KEY_SIZE);
341 CDEBUG(D_INFO, "set key %s for ino %lu \n",
342 md_key->md_ck.ck_key, inode->i_ino);
345 rc = fsfilt_set_md(obd, inode, handle, md_key,
346 sizeof(*md_key), EA_KEY);
349 OBD_FREE(md_key, sizeof(*md_key));
353 int mds_set_crypto_type(struct obd_device *obd, void *val, __u32 vallen)
355 struct mds_obd *mds = &obd->u.mds;
358 if (vallen >= strlen("mks") &&
359 memcmp(val, "mks", vallen) == 0) {
360 mds->mds_crypto_type = MKS_TYPE;
361 CDEBUG(D_IOCTL, "mks type\n");
363 if (vallen >= strlen("gks") &&
364 memcmp(val, "gks", vallen) == 0) {
365 mds->mds_crypto_type = GKS_TYPE;
366 CDEBUG(D_IOCTL, "gks type \n");
371 /* Note that we can copy all of the fields, just some will not be "valid" */
372 void mds_pack_inode2body(struct obd_device *obd, struct mds_body *b,
373 struct inode *inode, int fid)
375 b->valid |= OBD_MD_FLID | OBD_MD_FLCTIME | OBD_MD_FLUID |
376 OBD_MD_FLGID | OBD_MD_FLFLAGS | OBD_MD_FLTYPE |
377 OBD_MD_FLMODE | OBD_MD_FLNLINK | OBD_MD_FLGENER |
378 OBD_MD_FLATIME | OBD_MD_FLMTIME; /* bug 2020 */
380 if (!S_ISREG(inode->i_mode)) {
381 b->valid |= OBD_MD_FLSIZE | OBD_MD_FLBLOCKS |
382 OBD_MD_FLATIME | OBD_MD_FLMTIME |
385 b->atime = LTIME_S(inode->i_atime);
386 b->mtime = LTIME_S(inode->i_mtime);
387 b->ctime = LTIME_S(inode->i_ctime);
388 b->mode = inode->i_mode;
389 b->size = inode->i_size;
390 b->blocks = inode->i_blocks;
391 b->uid = inode->i_uid;
392 b->gid = inode->i_gid;
393 b->flags = inode->i_flags;
394 b->rdev = inode->i_rdev;
396 /* Return the correct link count for orphan inodes */
397 if (mds_inode_is_orphan(inode)) {
399 } else if (S_ISDIR(inode->i_mode)) {
402 b->nlink = inode->i_nlink;
406 b->valid |= OBD_MD_FID;
408 mds_pack_inode2id(obd, &b->id1, inode, fid);
412 static int mds_setattr_unpack(struct ptlrpc_request *req, int offset,
413 struct mds_update_record *r)
415 struct iattr *attr = &r->ur_iattr;
416 struct mds_rec_setattr *rec;
419 rec = lustre_swab_reqbuf(req, offset, sizeof(*rec),
420 lustre_swab_mds_rec_setattr);
424 r->ur_id1 = &rec->sa_id;
425 attr->ia_valid = rec->sa_valid;
426 attr->ia_mode = rec->sa_mode;
427 attr->ia_uid = rec->sa_uid;
428 attr->ia_gid = rec->sa_gid;
429 attr->ia_size = rec->sa_size;
430 LTIME_S(attr->ia_atime) = rec->sa_atime;
431 LTIME_S(attr->ia_mtime) = rec->sa_mtime;
432 LTIME_S(attr->ia_ctime) = rec->sa_ctime;
433 attr->ia_attr_flags = rec->sa_attr_flags;
435 LASSERT_REQSWAB (req, offset + 1);
436 if (req->rq_reqmsg->bufcount > offset + 1) {
437 r->ur_eadata = lustre_msg_buf (req->rq_reqmsg,
439 if (r->ur_eadata == NULL)
441 r->ur_eadatalen = req->rq_reqmsg->buflens[offset + 1];
444 if (req->rq_reqmsg->bufcount > offset + 2) {
445 r->ur_ea2data = lustre_msg_buf(req->rq_reqmsg, offset + 2, 0);
446 if (r->ur_ea2data == NULL)
449 r->ur_ea2datalen = req->rq_reqmsg->buflens[offset + 2];
452 if (req->rq_reqmsg->bufcount > offset + 3) {
453 r->ur_ea3data = lustre_msg_buf(req->rq_reqmsg, offset + 3, 0);
454 if (r->ur_ea3data == NULL)
457 r->ur_ea3datalen = req->rq_reqmsg->buflens[offset + 3];
463 static int mds_create_unpack(struct ptlrpc_request *req, int offset,
464 struct mds_update_record *r)
466 struct mds_rec_create *rec;
469 rec = lustre_swab_reqbuf (req, offset, sizeof (*rec),
470 lustre_swab_mds_rec_create);
474 r->ur_id1 = &rec->cr_id;
475 r->ur_id2 = &rec->cr_replayid;
476 r->ur_mode = rec->cr_mode;
477 r->ur_rdev = rec->cr_rdev;
478 r->ur_time = rec->cr_time;
479 r->ur_flags = rec->cr_flags;
481 LASSERT_REQSWAB (req, offset + 1);
482 r->ur_name = lustre_msg_string (req->rq_reqmsg, offset + 1, 0);
483 if (r->ur_name == NULL)
485 r->ur_namelen = req->rq_reqmsg->buflens[offset + 1];
487 LASSERT_REQSWAB (req, offset + 2);
488 if (req->rq_reqmsg->bufcount > offset + 2) {
489 if (S_ISLNK(r->ur_mode)) {
490 r->ur_tgt = lustre_msg_string(req->rq_reqmsg,
492 if (r->ur_tgt == NULL)
494 r->ur_tgtlen = req->rq_reqmsg->buflens[offset + 2];
495 } else if (S_ISDIR(r->ur_mode) ) {
496 /* Stripe info for mkdir - just a 16bit integer */
497 if (req->rq_reqmsg->buflens[offset + 2] != 2) {
498 CERROR("mkdir stripe info does not match "
499 "expected size %d vs 2\n",
500 req->rq_reqmsg->buflens[offset + 2]);
503 r->ur_eadata = lustre_swab_buf (req->rq_reqmsg,
504 offset + 2, 2, __swab16s);
505 r->ur_eadatalen = req->rq_reqmsg->buflens[offset + 2];
506 } else if (S_ISREG(r->ur_mode)){
507 r->ur_eadata = lustre_msg_buf (req->rq_reqmsg,
509 r->ur_eadatalen = req->rq_reqmsg->buflens[offset + 2];
511 /* Hm, no other users so far? */
518 static int mds_link_unpack(struct ptlrpc_request *req, int offset,
519 struct mds_update_record *r)
521 struct mds_rec_link *rec;
524 rec = lustre_swab_reqbuf (req, offset, sizeof (*rec),
525 lustre_swab_mds_rec_link);
529 r->ur_id1 = &rec->lk_id1;
530 r->ur_id2 = &rec->lk_id2;
531 r->ur_time = rec->lk_time;
533 LASSERT_REQSWAB (req, offset + 1);
534 r->ur_name = lustre_msg_string (req->rq_reqmsg, offset + 1, 0);
535 if (r->ur_name == NULL)
537 r->ur_namelen = req->rq_reqmsg->buflens[offset + 1];
541 static int mds_unlink_unpack(struct ptlrpc_request *req, int offset,
542 struct mds_update_record *r)
544 struct mds_rec_unlink *rec;
547 rec = lustre_swab_reqbuf (req, offset, sizeof (*rec),
548 lustre_swab_mds_rec_unlink);
552 r->ur_mode = rec->ul_mode;
553 r->ur_id1 = &rec->ul_id1;
554 r->ur_id2 = &rec->ul_id2;
555 r->ur_time = rec->ul_time;
557 LASSERT_REQSWAB (req, offset + 1);
558 r->ur_name = lustre_msg_string(req->rq_reqmsg, offset + 1, 0);
559 if (r->ur_name == NULL)
561 r->ur_namelen = req->rq_reqmsg->buflens[offset + 1];
565 static int mds_rename_unpack(struct ptlrpc_request *req, int offset,
566 struct mds_update_record *r)
568 struct mds_rec_rename *rec;
571 rec = lustre_swab_reqbuf (req, offset, sizeof (*rec),
572 lustre_swab_mds_rec_rename);
576 r->ur_id1 = &rec->rn_id1;
577 r->ur_id2 = &rec->rn_id2;
578 r->ur_time = rec->rn_time;
580 LASSERT_REQSWAB (req, offset + 1);
581 r->ur_name = lustre_msg_string(req->rq_reqmsg, offset + 1, 0);
582 if (r->ur_name == NULL)
584 r->ur_namelen = req->rq_reqmsg->buflens[offset + 1];
586 LASSERT_REQSWAB (req, offset + 2);
587 r->ur_tgt = lustre_msg_string(req->rq_reqmsg, offset + 2, 0);
588 if (r->ur_tgt == NULL)
590 r->ur_tgtlen = req->rq_reqmsg->buflens[offset + 2];
594 static int mds_open_unpack(struct ptlrpc_request *req, int offset,
595 struct mds_update_record *r)
597 struct mds_rec_create *rec;
600 rec = lustre_swab_reqbuf (req, offset, sizeof (*rec),
601 lustre_swab_mds_rec_create);
605 r->ur_id1 = &rec->cr_id;
606 r->ur_id2 = &rec->cr_replayid;
607 r->ur_mode = rec->cr_mode;
608 r->ur_rdev = rec->cr_rdev;
609 r->ur_time = rec->cr_time;
610 r->ur_flags = rec->cr_flags;
612 LASSERT_REQSWAB (req, offset + 1);
613 r->ur_name = lustre_msg_string (req->rq_reqmsg, offset + 1, 0);
614 if (r->ur_name == NULL)
616 r->ur_namelen = req->rq_reqmsg->buflens[offset + 1];
618 LASSERT_REQSWAB (req, offset + 2);
620 if (req->rq_reqmsg->bufcount > offset + 2) {
621 r->ur_eadata = lustre_msg_buf(req->rq_reqmsg, offset + 2, 0);
622 if (r->ur_eadata == NULL)
624 r->ur_eadatalen = req->rq_reqmsg->buflens[offset + 2];
627 if (rec->cr_flags & MDS_OPEN_HAS_KEY) {
628 LASSERT(req->rq_reqmsg->bufcount > offset + 3);
629 r->ur_ea2data = lustre_msg_buf(req->rq_reqmsg, offset + 3, 0);
630 r->ur_ea2datalen = req->rq_reqmsg->buflens[offset + 3];
635 typedef int (*update_unpacker)(struct ptlrpc_request *req, int offset,
636 struct mds_update_record *r);
638 static update_unpacker mds_unpackers[REINT_MAX + 1] = {
639 [REINT_SETATTR] mds_setattr_unpack,
640 [REINT_CREATE] mds_create_unpack,
641 [REINT_LINK] mds_link_unpack,
642 [REINT_UNLINK] mds_unlink_unpack,
643 [REINT_RENAME] mds_rename_unpack,
644 [REINT_OPEN] mds_open_unpack,
647 int mds_update_unpack(struct ptlrpc_request *req, int offset,
648 struct mds_update_record *rec)
656 * NB don't lustre_swab_reqbuf() here. We're just taking a peek and we
657 * want to leave it to the specific unpacker once we've identified the
660 opcodep = lustre_msg_buf (req->rq_reqmsg, offset, sizeof(*opcodep));
665 if (lustre_msg_swabbed (req->rq_reqmsg))
668 if (opcode > REINT_MAX ||
669 mds_unpackers[opcode] == NULL) {
670 CERROR ("Unexpected opcode %d\n", opcode);
676 rec->ur_opcode = opcode;
678 rc = mds_unpackers[opcode](req, offset, rec);
681 rec->ur_fsuid = req->rq_uid;
687 * here we take simple rule: once uid/fsuid is root, we also squash
688 * the gid/fsgid, don't care setuid/setgid attributes.
691 int mds_squash_root(struct mds_obd *mds, struct mds_req_sec_desc *rsd,
694 if (!mds->mds_squash_uid || *peernid == mds->mds_nosquash_nid)
697 if (rsd->rsd_uid && rsd->rsd_fsuid)
700 CDEBUG(D_SEC, "squash req from "LPX64":"
701 "(%u:%u-%u:%u/%x)=>(%u:%u-%u:%u/%x)\n", *peernid,
702 rsd->rsd_uid, rsd->rsd_gid,
703 rsd->rsd_fsuid, rsd->rsd_fsgid, rsd->rsd_cap,
704 rsd->rsd_uid ? rsd->rsd_uid : mds->mds_squash_uid,
705 rsd->rsd_uid ? rsd->rsd_gid : mds->mds_squash_gid,
706 rsd->rsd_fsuid ? rsd->rsd_fsuid : mds->mds_squash_uid,
707 rsd->rsd_fsuid ? rsd->rsd_fsgid : mds->mds_squash_gid,
708 rsd->rsd_cap & ~CAP_FS_MASK);
710 if (rsd->rsd_uid == 0) {
711 rsd->rsd_uid = mds->mds_squash_uid;
712 rsd->rsd_gid = mds->mds_squash_gid;
714 if (rsd->rsd_fsuid == 0) {
715 rsd->rsd_fsuid = mds->mds_squash_uid;
716 rsd->rsd_fsgid = mds->mds_squash_gid;
718 rsd->rsd_cap &= ~CAP_FS_MASK;
723 /********************************
724 * MDS uid/gid mapping handling *
725 ********************************/
728 struct mds_idmap_entry* idmap_alloc_entry(__u32 rmt_id, __u32 lcl_id)
730 struct mds_idmap_entry *e;
732 OBD_ALLOC(e, sizeof(*e));
736 INIT_LIST_HEAD(&e->rmt_hash);
737 INIT_LIST_HEAD(&e->lcl_hash);
738 atomic_set(&e->refcount, 1);
745 void idmap_free_entry(struct mds_idmap_entry *e)
747 if (!list_empty(&e->rmt_hash))
748 list_del(&e->rmt_hash);
749 if (!list_empty(&e->lcl_hash))
750 list_del(&e->lcl_hash);
751 OBD_FREE(e, sizeof(*e));
755 int idmap_insert_entry(struct list_head *rmt_hash, struct list_head *lcl_hash,
756 struct mds_idmap_entry *new, const char *warn_msg)
758 struct list_head *rmt_head = &rmt_hash[MDS_IDMAP_HASHFUNC(new->rmt_id)];
759 struct list_head *lcl_head = &lcl_hash[MDS_IDMAP_HASHFUNC(new->lcl_id)];
760 struct mds_idmap_entry *e;
762 list_for_each_entry(e, rmt_head, rmt_hash) {
763 if (e->rmt_id == new->rmt_id &&
764 e->lcl_id == new->lcl_id) {
765 atomic_inc(&e->refcount);
768 if (e->rmt_id == new->rmt_id && warn_msg)
769 CWARN("%s: rmt id %u already map to %u (new %u)\n",
770 warn_msg, e->rmt_id, e->lcl_id, new->lcl_id);
771 if (e->lcl_id == new->lcl_id && warn_msg)
772 CWARN("%s: lcl id %u already be mapped from %u "
773 "(new %u)\n", warn_msg,
774 e->lcl_id, e->rmt_id, new->rmt_id);
777 list_add_tail(rmt_head, &new->rmt_hash);
778 list_add_tail(lcl_head, &new->lcl_hash);
783 int idmap_remove_entry(struct list_head *rmt_hash, struct list_head *lcl_hash,
784 __u32 rmt_id, __u32 lcl_id)
786 struct list_head *rmt_head = &rmt_hash[MDS_IDMAP_HASHFUNC(rmt_id)];
787 struct mds_idmap_entry *e;
789 list_for_each_entry(e, rmt_head, rmt_hash) {
790 if (e->rmt_id == rmt_id && e->lcl_id == lcl_id) {
791 if (atomic_dec_and_test(&e->refcount)) {
792 list_del(&e->rmt_hash);
793 list_del(&e->lcl_hash);
794 OBD_FREE(e, sizeof(*e));
803 int mds_idmap_add(struct mds_idmap_table *tbl,
804 uid_t rmt_uid, uid_t lcl_uid,
805 gid_t rmt_gid, gid_t lcl_gid)
807 struct mds_idmap_entry *ue, *ge;
813 ue = idmap_alloc_entry(rmt_uid, lcl_uid);
816 ge = idmap_alloc_entry(rmt_gid, lcl_gid);
818 idmap_free_entry(ue);
822 spin_lock(&tbl->mit_lock);
824 if (idmap_insert_entry(tbl->mit_idmaps[MDS_RMT_UIDMAP_IDX],
825 tbl->mit_idmaps[MDS_LCL_UIDMAP_IDX],
826 ue, "UID mapping")) {
827 idmap_free_entry(ue);
830 if (idmap_insert_entry(tbl->mit_idmaps[MDS_RMT_GIDMAP_IDX],
831 tbl->mit_idmaps[MDS_LCL_GIDMAP_IDX],
832 ge, "GID mapping")) {
833 idmap_free_entry(ge);
836 spin_unlock(&tbl->mit_lock);
840 int mds_idmap_del(struct mds_idmap_table *tbl,
841 uid_t rmt_uid, uid_t lcl_uid,
842 gid_t rmt_gid, gid_t lcl_gid)
849 spin_lock(&tbl->mit_lock);
850 idmap_remove_entry(tbl->mit_idmaps[MDS_RMT_UIDMAP_IDX],
851 tbl->mit_idmaps[MDS_LCL_UIDMAP_IDX],
853 idmap_remove_entry(tbl->mit_idmaps[MDS_RMT_GIDMAP_IDX],
854 tbl->mit_idmaps[MDS_LCL_GIDMAP_IDX],
856 spin_unlock(&tbl->mit_lock);
861 __u32 idmap_lookup_id(struct list_head *hash, int reverse, __u32 id)
863 struct list_head *head = &hash[MDS_IDMAP_HASHFUNC(id)];
864 struct mds_idmap_entry *e;
867 list_for_each_entry(e, head, rmt_hash) {
871 return MDS_IDMAP_NOTFOUND;
873 list_for_each_entry(e, head, lcl_hash) {
877 return MDS_IDMAP_NOTFOUND;
881 int mds_idmap_lookup_uid(struct mds_idmap_table *tbl, int reverse, uid_t uid)
883 struct list_head *hash;
886 return MDS_IDMAP_NOTFOUND;
889 hash = tbl->mit_idmaps[MDS_RMT_UIDMAP_IDX];
891 hash = tbl->mit_idmaps[MDS_LCL_UIDMAP_IDX];
893 spin_lock(&tbl->mit_lock);
894 uid = idmap_lookup_id(hash, reverse, uid);
895 spin_unlock(&tbl->mit_lock);
900 int mds_idmap_lookup_gid(struct mds_idmap_table *tbl, int reverse, gid_t gid)
902 struct list_head *hash;
905 return MDS_IDMAP_NOTFOUND;
908 hash = tbl->mit_idmaps[MDS_RMT_GIDMAP_IDX];
910 hash = tbl->mit_idmaps[MDS_LCL_GIDMAP_IDX];
912 spin_lock(&tbl->mit_lock);
913 gid = idmap_lookup_id(hash, reverse, gid);
914 spin_unlock(&tbl->mit_lock);
919 struct mds_idmap_table *mds_idmap_alloc()
921 struct mds_idmap_table *tbl;
924 OBD_ALLOC(tbl, sizeof(*tbl));
928 spin_lock_init(&tbl->mit_lock);
929 for (i = 0; i < MDS_IDMAP_N_HASHES; i++)
930 for (j = 0; j < MDS_IDMAP_HASHSIZE; j++)
931 INIT_LIST_HEAD(&tbl->mit_idmaps[i][j]);
936 static void idmap_clear_rmt_hash(struct list_head *list)
938 struct mds_idmap_entry *e;
941 for (i = 0; i < MDS_IDMAP_HASHSIZE; i++) {
942 while (!list_empty(&list[i])) {
943 e = list_entry(list[i].next, struct mds_idmap_entry,
950 void mds_idmap_free(struct mds_idmap_table *tbl)
954 spin_lock(&tbl->mit_lock);
955 idmap_clear_rmt_hash(tbl->mit_idmaps[MDS_RMT_UIDMAP_IDX]);
956 idmap_clear_rmt_hash(tbl->mit_idmaps[MDS_RMT_GIDMAP_IDX]);
958 /* paranoid checking */
959 for (i = 0; i < MDS_IDMAP_HASHSIZE; i++) {
960 LASSERT(list_empty(&tbl->mit_idmaps[MDS_LCL_UIDMAP_IDX][i]));
961 LASSERT(list_empty(&tbl->mit_idmaps[MDS_LCL_GIDMAP_IDX][i]));
963 spin_unlock(&tbl->mit_lock);
965 OBD_FREE(tbl, sizeof(*tbl));
968 /*********************************
969 * helpers doing mapping for MDS *
970 *********************************/
973 * we allow remote setuid/setgid to an "authencated" one,
974 * this policy probably change later.
977 int mds_req_secdesc_do_map(struct mds_export_data *med,
978 struct mds_req_sec_desc *rsd)
980 struct mds_idmap_table *idmap = med->med_idmap;
984 uid = mds_idmap_lookup_uid(idmap, 0, rsd->rsd_uid);
985 if (uid == MDS_IDMAP_NOTFOUND) {
986 CERROR("can't find map for uid %u\n", rsd->rsd_uid);
990 if (rsd->rsd_uid == rsd->rsd_fsuid)
993 fsuid = mds_idmap_lookup_uid(idmap, 0, rsd->rsd_fsuid);
994 if (fsuid == MDS_IDMAP_NOTFOUND) {
995 CERROR("can't find map for fsuid %u\n", rsd->rsd_fsuid);
1000 gid = mds_idmap_lookup_gid(idmap, 0, rsd->rsd_gid);
1001 if (gid == MDS_IDMAP_NOTFOUND) {
1002 CERROR("can't find map for gid %u\n", rsd->rsd_gid);
1006 if (rsd->rsd_gid == rsd->rsd_fsgid)
1009 fsgid = mds_idmap_lookup_gid(idmap, 0, rsd->rsd_fsgid);
1010 if (fsgid == MDS_IDMAP_NOTFOUND) {
1011 CERROR("can't find map for fsgid %u\n", rsd->rsd_fsgid);
1018 rsd->rsd_fsuid = fsuid;
1019 rsd->rsd_fsgid = fsgid;
1024 void mds_body_do_reverse_map(struct mds_export_data *med,
1025 struct mds_body *body)
1030 if (!med->med_remote)
1034 if (body->valid & OBD_MD_FLUID) {
1035 uid = mds_idmap_lookup_uid(med->med_idmap, 1, body->uid);
1036 if (uid == MDS_IDMAP_NOTFOUND) {
1037 uid = med->med_nllu;
1038 if (body->valid & OBD_MD_FLMODE) {
1039 body->mode = (body->mode & ~S_IRWXU) |
1040 ((body->mode & S_IRWXO) << 6);
1045 if (body->valid & OBD_MD_FLGID) {
1046 gid = mds_idmap_lookup_gid(med->med_idmap, 1, body->gid);
1047 if (gid == MDS_IDMAP_NOTFOUND) {
1048 gid = med->med_nllg;
1049 if (body->valid & OBD_MD_FLMODE) {
1050 body->mode = (body->mode & ~S_IRWXG) |
1051 ((body->mode & S_IRWXO) << 3);
1060 /**********************
1061 * MDS ucred handling *
1062 **********************/
1064 static inline void drop_ucred_ginfo(struct lvfs_ucred *ucred)
1066 if (ucred->luc_ginfo) {
1067 put_group_info(ucred->luc_ginfo);
1068 ucred->luc_ginfo = NULL;
1072 static inline void drop_ucred_lsd(struct lvfs_ucred *ucred)
1074 if (ucred->luc_lsd) {
1075 mds_put_lsd(ucred->luc_lsd);
1076 ucred->luc_lsd = NULL;
1081 * the heart of the uid/gid handling and security checking.
1083 * root could set any group_info if we allowed setgroups, while
1084 * normal user only could 'reduce' their group members -- which
1085 * is somewhat expensive.
1087 * authenticated as mds user (using mds service credential) could
1088 * bypass all checkings.
1090 int mds_init_ucred(struct lvfs_ucred *ucred,
1091 struct ptlrpc_request *req,
1092 struct mds_req_sec_desc *rsd)
1094 struct mds_obd *mds = &req->rq_export->exp_obd->u.mds;
1095 struct mds_export_data *med = &req->rq_export->u.eu_mds_data;
1096 struct lustre_sec_desc *lsd;
1097 ptl_nid_t peernid = req->rq_peer.peer_id.nid;
1098 struct group_info *gnew;
1099 unsigned int setuid, setgid, strong_sec, root_squashed;
1105 LASSERT(rsd->rsd_ngroups <= LUSTRE_MAX_GROUPS);
1107 if (SEC_FLAVOR_MAJOR(req->rq_req_secflvr) == PTLRPCS_FLVR_MAJOR_GSS &&
1108 (SEC_FLAVOR_SVC(req->rq_req_secflvr) == PTLRPCS_SVC_AUTH ||
1109 SEC_FLAVOR_SVC(req->rq_req_secflvr) == PTLRPCS_SVC_PRIV))
1114 LASSERT(!(req->rq_remote_realm && !strong_sec));
1116 if (strong_sec && req->rq_auth_uid == -1) {
1117 CWARN("user not authenticated, deny access\n");
1121 /* sanity check: if we use strong authentication, we expect the
1122 * uid which client claimed is true.
1123 * not apply to special mds user .
1125 if (!req->rq_auth_usr_mds && strong_sec) {
1126 if (!med->med_remote) {
1127 if (req->rq_auth_uid != rsd->rsd_uid) {
1128 CERROR("local client "LPU64": auth uid %u "
1129 "while client claim %u:%u/%u:%u\n",
1130 peernid, req->rq_auth_uid,
1131 rsd->rsd_uid, rsd->rsd_gid,
1132 rsd->rsd_fsuid, rsd->rsd_fsgid);
1136 if (req->rq_mapped_uid == MDS_IDMAP_NOTFOUND) {
1137 CWARN("no mapping found, deny\n");
1141 if (mds_req_secdesc_do_map(med, rsd))
1144 if (req->rq_mapped_uid != rsd->rsd_uid) {
1145 CERROR("remote client "LPU64": auth uid %u "
1146 "while client claim %u:%u/%u:%u\n",
1147 peernid, req->rq_auth_uid,
1148 rsd->rsd_uid, rsd->rsd_gid,
1149 rsd->rsd_fsuid, rsd->rsd_fsgid);
1155 /* now LSD come into play */
1156 ucred->luc_ginfo = NULL;
1157 ucred->luc_lsd = lsd = mds_get_lsd(rsd->rsd_uid);
1160 CERROR("Deny access without LSD: uid %d\n", rsd->rsd_uid);
1164 lsd_perms = mds_lsd_get_perms(lsd, med->med_remote, 0, peernid);
1166 /* check setuid/setgid permissions.
1167 * again not apply to special mds user.
1169 if (!req->rq_auth_usr_mds) {
1170 /* find out the setuid/setgid attempt */
1171 setuid = (rsd->rsd_uid != rsd->rsd_fsuid);
1172 setgid = (rsd->rsd_gid != rsd->rsd_fsgid ||
1173 rsd->rsd_gid != lsd->lsd_gid);
1175 /* check permission of setuid */
1176 if (setuid && !(lsd_perms & LSD_PERM_SETUID)) {
1177 CWARN("mds blocked setuid attempt (%u -> %u) "
1178 "from "LPU64"\n", rsd->rsd_uid, rsd->rsd_fsuid,
1183 /* check permission of setgid */
1184 if (setgid && !(lsd_perms & LSD_PERM_SETGID)) {
1185 CWARN("mds blocked setgid attempt (%u:%u/%u:%u -> %u) "
1186 "from "LPU64"\n", rsd->rsd_uid, rsd->rsd_gid,
1187 rsd->rsd_fsuid, rsd->rsd_fsgid, lsd->lsd_gid,
1193 root_squashed = mds_squash_root(mds, rsd, &peernid);
1195 /* remove privilege for non-root user */
1197 rsd->rsd_cap &= ~CAP_FS_MASK;
1199 /* by now every fields other than groups in rsd have been granted */
1200 ucred->luc_nid = peernid;
1201 ucred->luc_uid = rsd->rsd_uid;
1202 ucred->luc_gid = rsd->rsd_gid;
1203 ucred->luc_fsuid = rsd->rsd_fsuid;
1204 ucred->luc_fsgid = rsd->rsd_fsgid;
1205 ucred->luc_cap = rsd->rsd_cap;
1207 /* don't use any supplementary group if we squashed root.
1208 * XXX The exact behavior of root_squash is not defined, we just
1209 * keep the reminder here */
1213 /* install groups from LSD */
1214 if (lsd->lsd_ginfo) {
1215 ucred->luc_ginfo = lsd->lsd_ginfo;
1216 get_group_info(ucred->luc_ginfo);
1219 /* everything is done if we don't allow setgroups, or it is
1220 * from remote client (which implies forced to be no-setgroups).
1222 * Note: remote user's supplementary groups sent along the request
1223 * (if any) are all ignored, but we make the mapped local user's
1224 * supplementary groups take effect.
1226 if (med->med_remote || !(lsd_perms & LSD_PERM_SETGRP))
1229 /* root could set any groups as he want (if allowed), normal
1230 * users only could reduce his group array.
1232 if (ucred->luc_uid == 0) {
1233 drop_ucred_ginfo(ucred);
1235 if (rsd->rsd_ngroups == 0)
1238 gnew = groups_alloc(rsd->rsd_ngroups);
1240 CERROR("out of memory\n");
1241 drop_ucred_lsd(ucred);
1244 groups_from_buffer(gnew, rsd->rsd_groups);
1245 groups_sort(gnew); /* don't rely on client doing this */
1247 ucred->luc_ginfo = gnew;
1249 __u32 set = 0, cur = 0;
1250 struct group_info *ginfo = ucred->luc_ginfo;
1255 /* Note: freeing a group_info count on 'nblocks' instead of
1256 * 'ngroups', thus we can safely alloc enough buffer and reduce
1257 * and ngroups number later.
1259 gnew = groups_alloc(rsd->rsd_ngroups);
1261 CERROR("out of memory\n");
1262 drop_ucred_ginfo(ucred);
1263 drop_ucred_lsd(ucred);
1267 while (cur < rsd->rsd_ngroups) {
1268 if (groups_search(ginfo, rsd->rsd_groups[cur])) {
1269 GROUP_AT(gnew, set) = rsd->rsd_groups[cur];
1274 gnew->ngroups = set;
1276 put_group_info(ucred->luc_ginfo);
1277 ucred->luc_ginfo = gnew;
1282 void mds_exit_ucred(struct lvfs_ucred *ucred)
1285 drop_ucred_ginfo(ucred);
1286 drop_ucred_lsd(ucred);