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LU-13699 mdt: Improve message reporting for mdt_identity.c
[fs/lustre-release.git] / lustre / mdt / mdt_identity.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
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.
9  *
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).
15  *
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
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2011, 2016, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  * Lustre is a trademark of Sun Microsystems, Inc.
31  *
32  * lustre/mdt/mdt_identity.c
33  *
34  * Author: Lai Siyao <lsy@clusterfs.com>
35  * Author: Fan Yong <fanyong@clusterfs.com>
36  */
37
38 #define DEBUG_SUBSYSTEM S_MDS
39
40 #include "mdt_internal.h"
41
42 static void mdt_identity_entry_init(struct upcall_cache_entry *entry,
43                                     void *unused)
44 {
45         entry->u.identity.mi_uc_entry = entry;
46 }
47
48 static void mdt_identity_entry_free(struct upcall_cache *cache,
49                                     struct upcall_cache_entry *entry)
50 {
51         struct md_identity *identity = &entry->u.identity;
52
53         if (identity->mi_ginfo) {
54                 put_group_info(identity->mi_ginfo);
55                 identity->mi_ginfo = NULL;
56         }
57
58         if (identity->mi_nperms) {
59                 LASSERT(identity->mi_perms);
60                 OBD_FREE_PTR_ARRAY(identity->mi_perms, identity->mi_nperms);
61                 identity->mi_nperms = 0;
62         }
63 }
64
65 static int mdt_identity_do_upcall(struct upcall_cache *cache,
66                                   struct upcall_cache_entry *entry)
67 {
68         char keystr[16];
69         char *argv[] = {
70                 [0] = cache->uc_upcall,
71                 [1] = cache->uc_name,
72                 [2] = keystr,
73                 [3] = NULL
74         };
75         char *envp[] = {
76                 [0] = "HOME=/",
77                 [1] = "PATH=/sbin:/usr/sbin",
78                 [2] = NULL
79         };
80         ktime_t start, end;
81         int rc;
82
83         ENTRY;
84         /* There is race condition:
85          * "uc_upcall" was changed just after "is_identity_get_disabled" check.
86          */
87         down_read(&cache->uc_upcall_rwsem);
88         CDEBUG(D_INFO, "The upcall is: '%s'\n", cache->uc_upcall);
89
90         if (unlikely(!strcmp(cache->uc_upcall, "NONE"))) {
91                 rc = -EREMCHG;
92                 CERROR("%s: extended identity requested for user '%llu' called with 'NONE' upcall: rc = %d\n",
93                        cache->uc_name, entry->ue_key, rc);
94                 GOTO(out, rc);
95         }
96
97         if (unlikely(cache->uc_upcall[0] == '\0')) {
98                 rc = -EREMCHG;
99                 CERROR("%s: extended identity requested for user '%llu' called with empty upcall: rc = %d\n",
100                        cache->uc_name, entry->ue_key, rc);
101                 GOTO(out, rc);
102         }
103
104         argv[0] = cache->uc_upcall;
105         snprintf(keystr, sizeof(keystr), "%llu", entry->ue_key);
106
107         start = ktime_get();
108         rc = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
109         end = ktime_get();
110         if (rc < 0) {
111                 CERROR("%s: error invoking upcall %s %s %s: rc %d; check /proc/fs/lustre/mdt/%s/identity_upcall, time %ldus: rc = %d\n",
112                        cache->uc_name, argv[0], argv[1], argv[2], rc,
113                        cache->uc_name, (long)ktime_us_delta(end, start), rc);
114         } else {
115                 CDEBUG(D_HA, "%s: invoked upcall %s %s %s, time %ldus\n",
116                        cache->uc_name, argv[0], argv[1], argv[2],
117                        (long)ktime_us_delta(end, start));
118                 rc = 0;
119         }
120         EXIT;
121 out:
122         up_read(&cache->uc_upcall_rwsem);
123         return rc;
124 }
125
126 static int mdt_identity_parse_downcall(struct upcall_cache *cache,
127                                        struct upcall_cache_entry *entry,
128                                        void *args)
129 {
130         struct md_identity *identity = &entry->u.identity;
131         struct identity_downcall_data *data = args;
132         struct group_info *ginfo = NULL;
133         struct md_perm *perms = NULL;
134         int size, i, rc = 0;
135
136         ENTRY;
137         LASSERT(data);
138         if (data->idd_ngroups > NGROUPS_MAX) {
139                 rc = -E2BIG;
140                 CERROR("%s: UID %u groups %u > maximum %u: rc = %d\n",
141                        cache->uc_name, data->idd_uid, data->idd_ngroups, NGROUPS_MAX, rc);
142                 goto out;
143         }
144
145         if (data->idd_ngroups > 0) {
146                 ginfo = groups_alloc(data->idd_ngroups);
147                 if (!ginfo) {
148                         rc = -ENOMEM;
149                         CERROR("%s: failed to alloc %d groups: rc = %d\n",
150                                cache->uc_name, data->idd_ngroups, rc);
151                         goto out;
152                 }
153
154                 lustre_groups_from_list(ginfo, data->idd_groups);
155                 lustre_groups_sort(ginfo);
156         }
157
158         if (data->idd_nperms) {
159                 size = data->idd_nperms * sizeof(*perms);
160                 OBD_ALLOC(perms, size);
161                 if (!perms) {
162                         rc = -ENOMEM;
163                         CERROR("%s: failed to alloc %d permissions: rc = %d\n",
164                                cache->uc_name, data->idd_nperms, rc);
165                         if (ginfo)
166                                 put_group_info(ginfo);
167                         goto out;
168                 }
169
170                 for (i = 0; i < data->idd_nperms; i++) {
171                         perms[i].mp_nid = data->idd_perms[i].pdd_nid;
172                         perms[i].mp_perm = data->idd_perms[i].pdd_perm;
173                 }
174         }
175
176         identity->mi_uid = data->idd_uid;
177         identity->mi_gid = data->idd_gid;
178         identity->mi_ginfo = ginfo;
179         identity->mi_nperms = data->idd_nperms;
180         identity->mi_perms = perms;
181
182         CDEBUG(D_OTHER, "parse mdt identity@%p: %d:%d, ngroups %u, nperms %u\n",
183                identity, identity->mi_uid, identity->mi_gid,
184                data->idd_ngroups, data->idd_nperms);
185
186 out:
187         RETURN(rc);
188 }
189
190 struct md_identity *mdt_identity_get(struct upcall_cache *cache, __u32 uid)
191 {
192         struct upcall_cache_entry *entry;
193
194         if (!cache)
195                 return ERR_PTR(-ENOENT);
196
197         entry = upcall_cache_get_entry(cache, (__u64)uid, NULL);
198         if (unlikely(!entry))
199                 return ERR_PTR(-ENOENT);
200         if (IS_ERR(entry))
201                 return ERR_CAST(entry);
202
203         return &entry->u.identity;
204 }
205
206 void mdt_identity_put(struct upcall_cache *cache, struct md_identity *identity)
207 {
208         if (!cache)
209                 return;
210
211         LASSERT(identity);
212         upcall_cache_put_entry(cache, identity->mi_uc_entry);
213 }
214
215 struct upcall_cache_ops mdt_identity_upcall_cache_ops = {
216         .init_entry     = mdt_identity_entry_init,
217         .free_entry     = mdt_identity_entry_free,
218         .do_upcall      = mdt_identity_do_upcall,
219         .parse_downcall = mdt_identity_parse_downcall,
220 };
221
222 void mdt_flush_identity(struct upcall_cache *cache, int uid)
223 {
224         if (uid < 0)
225                 upcall_cache_flush_idle(cache);
226         else
227                 upcall_cache_flush_one(cache, (__u64)uid, NULL);
228 }
229
230 /*
231  * If there is LNET_NID_ANY in perm[i].mp_nid,
232  * it must be perm[0].mp_nid, and act as default perm.
233  */
234 __u32 mdt_identity_get_perm(struct md_identity *identity, lnet_nid_t nid)
235 {
236         struct md_perm *perm;
237         int i;
238
239         if (!identity)
240                 return CFS_SETGRP_PERM;
241
242         perm = identity->mi_perms;
243         /* check exactly matched nid first */
244         for (i = identity->mi_nperms - 1; i > 0; i--) {
245                 if (perm[i].mp_nid != nid)
246                         continue;
247                 return perm[i].mp_perm;
248         }
249
250         /* check LNET_NID_ANY then */
251         if ((identity->mi_nperms > 0) &&
252             ((perm[0].mp_nid == nid) || (perm[0].mp_nid == LNET_NID_ANY)))
253                 return perm[0].mp_perm;
254
255         /* return default last */
256         return CFS_SETGRP_PERM;
257 }