1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2004, 2005 Cluster File Systems, Inc.
6 * Author: Lai Siyao <lsy@clusterfs.com>
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_FILTER
27 #include <linux/version.h>
28 #include <asm/uaccess.h>
29 #include <linux/file.h>
30 #include <linux/kmod.h>
32 #include <linux/lustre_fsfilt.h>
33 #include <linux/lustre_sec.h>
35 #include "filter_internal.h"
37 void filter_free_capa_keys(struct filter_obd *filter)
39 struct filter_capa_key *key, *n;
41 list_for_each_entry_safe(key, n, &filter->fo_capa_keys, k_list) {
42 list_del(&key->k_list);
43 OBD_FREE(key, sizeof(*key));
47 int filter_update_capa_key(struct obd_device *obd, struct lustre_capa_key *key)
49 struct filter_obd *filter = &obd->u.filter;
50 struct filter_capa_key *tmp = NULL, *rkey = NULL, *bkey = NULL;
54 spin_lock(&filter->fo_capa_lock);
55 list_for_each_entry(tmp, &filter->fo_capa_keys, k_list) {
56 if (tmp->k_key.lk_mdsid == le32_to_cpu(key->lk_mdsid)) {
63 spin_unlock(&filter->fo_capa_lock);
65 if (rkey && bkey && capa_key_cmp(&rkey->k_key, &bkey->k_key) < 0) {
72 OBD_ALLOC(tmp, sizeof(*tmp));
74 GOTO(out, rc = -ENOMEM);
76 spin_lock(&filter->fo_capa_lock);
77 list_add_tail(&tmp->k_list, &filter->fo_capa_keys);
78 spin_unlock(&filter->fo_capa_lock);
81 /* fields in lustre_capa_key are in cpu order */
82 tmp->k_key.lk_mdsid = le32_to_cpu(key->lk_mdsid);
83 tmp->k_key.lk_keyid = le32_to_cpu(key->lk_keyid);
84 tmp->k_key.lk_expiry = le64_to_cpu(key->lk_expiry);
85 memcpy(&tmp->k_key.lk_key, key->lk_key, sizeof(key->lk_key));
91 int filter_verify_capa(int cmd, struct obd_export *exp,
92 struct lustre_capa *capa)
94 struct obd_device *obd = exp->exp_obd;
95 struct filter_obd *filter = &obd->u.filter;
96 struct obd_capa *ocapa;
97 struct lustre_capa tcapa;
98 struct filter_capa_key *rkey = NULL, *bkey = NULL, *tmp;
99 __u8 hmac_key[CAPA_KEY_LEN];
103 /* capability is disabled */
104 if (filter->fo_capa_stat == 0)
110 if (cmd == OBD_BRW_WRITE && !(capa->lc_op & MAY_WRITE))
112 if (cmd == OBD_BRW_READ && !(capa->lc_op & (MAY_WRITE | MAY_READ)))
115 if (OBD_FAIL_CHECK(OBD_FAIL_FILTER_VERIFY_CAPA))
118 /* TODO: get fid from EA, and verify that against capa */
120 if (capa_expired(capa))
123 ocapa = capa_get(capa->lc_uid, capa->lc_op, capa->lc_mdsid,
124 capa->lc_ino, FILTER_CAPA, NULL, NULL, NULL);
127 /* fo_capa_lock protects capa too */
128 spin_lock(&filter->fo_capa_lock);
129 if (capa->lc_keyid == ocapa->c_capa.lc_keyid) {
130 rc = memcmp(capa, &ocapa->c_capa, sizeof(*capa));
131 } else if (ocapa->c_bvalid &&
132 capa->lc_keyid == ocapa->c_bkeyid) {
133 rc = memcmp(capa->lc_hmac, ocapa->c_bhmac,
134 sizeof(capa->lc_hmac));
136 /* ocapa is obsolete */
137 capa_put(ocapa, FILTER_CAPA);
138 spin_unlock(&filter->fo_capa_lock);
141 spin_unlock(&filter->fo_capa_lock);
143 capa_put(ocapa, FILTER_CAPA);
144 RETURN(rc ? -EACCES : 0);
148 spin_lock(&filter->fo_capa_lock);
149 list_for_each_entry(tmp, &filter->fo_capa_keys, k_list) {
150 if (tmp->k_key.lk_mdsid == capa->lc_mdsid) {
158 if (rkey && bkey && capa_key_cmp(&rkey->k_key, &bkey->k_key) < 0) {
164 if ((!rkey || rkey->k_key.lk_keyid != capa->lc_keyid) &&
165 (!bkey || bkey->k_key.lk_keyid != capa->lc_keyid)) {
166 spin_unlock(&filter->fo_capa_lock);
167 GOTO(out, rc = -ESTALE);
172 memcpy(&tcapa, capa, sizeof(tcapa));
173 tcapa.lc_keyid = rkey->k_key.lk_keyid;
174 memcpy(hmac_key, rkey->k_key.lk_key, sizeof(hmac_key));
175 spin_unlock(&filter->fo_capa_lock);
177 capa_hmac(filter->fo_capa_hmac, hmac_key, &tcapa);
179 /* store in capa cache */
180 ocapa = capa_get(capa->lc_uid, capa->lc_op, capa->lc_mdsid,
181 capa->lc_ino, FILTER_CAPA, capa, NULL, NULL);
183 GOTO(out, rc = -ENOMEM);
186 spin_lock(&filter->fo_capa_lock);
187 tcapa.lc_keyid = bkey->k_key.lk_keyid;
188 memcpy(hmac_key, bkey->k_key.lk_key, sizeof(hmac_key));
189 ocapa->c_bkeyid = bkey->k_key.lk_keyid;
190 spin_unlock(&filter->fo_capa_lock);
192 capa_hmac(filter->fo_capa_hmac, bkey->k_key.lk_key, &tcapa);
194 spin_lock(&filter->fo_capa_lock);
195 memcpy(ocapa->c_bhmac, tcapa.lc_hmac, sizeof(ocapa->c_bhmac));
196 spin_unlock(&filter->fo_capa_lock);