4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2016, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/mdt/mdt_identity.c
34 * Author: Lai Siyao <lsy@clusterfs.com>
35 * Author: Fan Yong <fanyong@clusterfs.com>
38 #define DEBUG_SUBSYSTEM S_MDS
40 #include <linux/module.h>
41 #include <linux/kernel.h>
43 #include <linux/kmod.h>
44 #include <linux/string.h>
45 #include <linux/stat.h>
46 #include <linux/errno.h>
47 #include <linux/version.h>
48 #include <linux/unistd.h>
49 #include <asm/uaccess.h>
51 #include <linux/stat.h>
52 #include <asm/uaccess.h>
53 #include <linux/slab.h>
55 #include <libcfs/libcfs.h>
57 #include <obd_class.h>
58 #include <obd_support.h>
59 #include <lustre_net.h>
60 #include <lustre_import.h>
61 #include <lustre_dlm.h>
62 #include <lustre_lib.h>
64 #include "mdt_internal.h"
66 static void mdt_identity_entry_init(struct upcall_cache_entry *entry,
69 entry->u.identity.mi_uc_entry = entry;
72 static void mdt_identity_entry_free(struct upcall_cache *cache,
73 struct upcall_cache_entry *entry)
75 struct md_identity *identity = &entry->u.identity;
77 if (identity->mi_ginfo) {
78 put_group_info(identity->mi_ginfo);
79 identity->mi_ginfo = NULL;
82 if (identity->mi_nperms) {
83 LASSERT(identity->mi_perms);
84 OBD_FREE(identity->mi_perms,
85 identity->mi_nperms * sizeof(struct md_perm));
86 identity->mi_nperms = 0;
90 static int mdt_identity_do_upcall(struct upcall_cache *cache,
91 struct upcall_cache_entry *entry)
95 [0] = cache->uc_upcall,
102 [1] = "PATH=/sbin:/usr/sbin",
109 /* There is race condition:
110 * "uc_upcall" was changed just after "is_identity_get_disabled" check.
112 down_read(&cache->uc_upcall_rwsem);
113 CDEBUG(D_INFO, "The upcall is: '%s'\n", cache->uc_upcall);
115 if (unlikely(!strcmp(cache->uc_upcall, "NONE"))) {
116 CERROR("no upcall set\n");
117 GOTO(out, rc = -EREMCHG);
120 argv[0] = cache->uc_upcall;
121 snprintf(keystr, sizeof(keystr), "%llu", entry->ue_key);
124 rc = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
127 CERROR("%s: error invoking upcall %s %s %s: rc %d; check /proc/fs/lustre/mdt/%s/identity_upcall, time %ldus\n",
128 cache->uc_name, argv[0], argv[1], argv[2], rc,
129 cache->uc_name, (long)ktime_us_delta(end, start));
131 CDEBUG(D_HA, "%s: invoked upcall %s %s %s, time %ldus\n",
132 cache->uc_name, argv[0], argv[1], argv[2],
133 (long)ktime_us_delta(end, start));
138 up_read(&cache->uc_upcall_rwsem);
142 static int mdt_identity_parse_downcall(struct upcall_cache *cache,
143 struct upcall_cache_entry *entry,
146 struct md_identity *identity = &entry->u.identity;
147 struct identity_downcall_data *data = args;
148 struct group_info *ginfo = NULL;
149 struct md_perm *perms = NULL;
154 if (data->idd_ngroups > NGROUPS_MAX)
157 if (data->idd_ngroups > 0) {
158 ginfo = groups_alloc(data->idd_ngroups);
160 CERROR("failed to alloc %d groups\n", data->idd_ngroups);
164 lustre_groups_from_list(ginfo, data->idd_groups);
165 lustre_groups_sort(ginfo);
168 if (data->idd_nperms) {
169 size = data->idd_nperms * sizeof(*perms);
170 OBD_ALLOC(perms, size);
172 CERROR("failed to alloc %d permissions\n",
175 put_group_info(ginfo);
179 for (i = 0; i < data->idd_nperms; i++) {
180 perms[i].mp_nid = data->idd_perms[i].pdd_nid;
181 perms[i].mp_perm = data->idd_perms[i].pdd_perm;
185 identity->mi_uid = data->idd_uid;
186 identity->mi_gid = data->idd_gid;
187 identity->mi_ginfo = ginfo;
188 identity->mi_nperms = data->idd_nperms;
189 identity->mi_perms = perms;
191 CDEBUG(D_OTHER, "parse mdt identity@%p: %d:%d, ngroups %u, nperms %u\n",
192 identity, identity->mi_uid, identity->mi_gid,
193 data->idd_ngroups, data->idd_nperms);
198 struct md_identity *mdt_identity_get(struct upcall_cache *cache, __u32 uid)
200 struct upcall_cache_entry *entry;
203 return ERR_PTR(-ENOENT);
205 entry = upcall_cache_get_entry(cache, (__u64)uid, NULL);
207 return ERR_PTR(PTR_ERR(entry));
208 else if (unlikely(!entry))
209 return ERR_PTR(-ENOENT);
211 return &entry->u.identity;
214 void mdt_identity_put(struct upcall_cache *cache, struct md_identity *identity)
220 upcall_cache_put_entry(cache, identity->mi_uc_entry);
223 struct upcall_cache_ops mdt_identity_upcall_cache_ops = {
224 .init_entry = mdt_identity_entry_init,
225 .free_entry = mdt_identity_entry_free,
226 .do_upcall = mdt_identity_do_upcall,
227 .parse_downcall = mdt_identity_parse_downcall,
230 void mdt_flush_identity(struct upcall_cache *cache, int uid)
233 upcall_cache_flush_idle(cache);
235 upcall_cache_flush_one(cache, (__u64)uid, NULL);
239 * If there is LNET_NID_ANY in perm[i].mp_nid,
240 * it must be perm[0].mp_nid, and act as default perm.
242 __u32 mdt_identity_get_perm(struct md_identity *identity, lnet_nid_t nid)
245 struct md_perm *perm;
249 return CFS_SETGRP_PERM;
251 perm = identity->mi_perms;
252 /* check exactly matched nid first */
253 for (i = identity->mi_nperms - 1; i > 0; i--) {
254 if (perm[i].mp_nid != nid)
256 return perm[i].mp_perm;
259 /* check LNET_NID_ANY then */
260 if ((identity->mi_nperms > 0) &&
261 ((perm[0].mp_nid == nid) || (perm[0].mp_nid == LNET_NID_ANY)))
262 return perm[0].mp_perm;
264 /* return default last */
265 return CFS_SETGRP_PERM;