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a55370a3 | 1 | /* |
a55370a3 N |
2 | * Copyright (c) 2004 The Regents of the University of Michigan. |
3 | * All rights reserved. | |
4 | * | |
5 | * Andy Adamson <andros@citi.umich.edu> | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the name of the University nor the names of its | |
17 | * contributors may be used to endorse or promote products derived | |
18 | * from this software without specific prior written permission. | |
19 | * | |
20 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
21 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
23 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
27 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
28 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
29 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
30 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
31 | * | |
32 | */ | |
33 | ||
190e4fbf N |
34 | #include <linux/file.h> |
35 | #include <linux/namei.h> | |
a55370a3 | 36 | #include <linux/crypto.h> |
e8edc6e0 | 37 | #include <linux/sched.h> |
9a74af21 BH |
38 | |
39 | #include "nfsd.h" | |
40 | #include "state.h" | |
0a3adade | 41 | #include "vfs.h" |
a55370a3 N |
42 | |
43 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
44 | ||
190e4fbf | 45 | /* Globals */ |
a63bb996 | 46 | static struct path rec_dir; |
190e4fbf N |
47 | static int rec_dir_init = 0; |
48 | ||
d84f4f99 DH |
49 | static int |
50 | nfs4_save_creds(const struct cred **original_creds) | |
190e4fbf | 51 | { |
d84f4f99 DH |
52 | struct cred *new; |
53 | ||
54 | new = prepare_creds(); | |
55 | if (!new) | |
56 | return -ENOMEM; | |
57 | ||
58 | new->fsuid = 0; | |
59 | new->fsgid = 0; | |
60 | *original_creds = override_creds(new); | |
61 | put_cred(new); | |
62 | return 0; | |
190e4fbf N |
63 | } |
64 | ||
65 | static void | |
d84f4f99 | 66 | nfs4_reset_creds(const struct cred *original) |
190e4fbf | 67 | { |
d84f4f99 | 68 | revert_creds(original); |
190e4fbf N |
69 | } |
70 | ||
a55370a3 N |
71 | static void |
72 | md5_to_hex(char *out, char *md5) | |
73 | { | |
74 | int i; | |
75 | ||
76 | for (i=0; i<16; i++) { | |
77 | unsigned char c = md5[i]; | |
78 | ||
79 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
80 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
81 | } | |
82 | *out = '\0'; | |
83 | } | |
84 | ||
b37ad28b | 85 | __be32 |
a55370a3 N |
86 | nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname) |
87 | { | |
88 | struct xdr_netobj cksum; | |
35058687 | 89 | struct hash_desc desc; |
60c74f81 | 90 | struct scatterlist sg; |
b37ad28b | 91 | __be32 status = nfserr_resource; |
a55370a3 N |
92 | |
93 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
94 | clname->len, clname->data); | |
35058687 HX |
95 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
96 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); | |
97 | if (IS_ERR(desc.tfm)) | |
98 | goto out_no_tfm; | |
99 | cksum.len = crypto_hash_digestsize(desc.tfm); | |
a55370a3 N |
100 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
101 | if (cksum.data == NULL) | |
102 | goto out; | |
a55370a3 | 103 | |
60c74f81 | 104 | sg_init_one(&sg, clname->data, clname->len); |
a55370a3 | 105 | |
60c74f81 | 106 | if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data)) |
35058687 | 107 | goto out; |
a55370a3 N |
108 | |
109 | md5_to_hex(dname, cksum.data); | |
110 | ||
a55370a3 N |
111 | status = nfs_ok; |
112 | out: | |
2bd9e7b6 | 113 | kfree(cksum.data); |
35058687 HX |
114 | crypto_free_hash(desc.tfm); |
115 | out_no_tfm: | |
a55370a3 N |
116 | return status; |
117 | } | |
190e4fbf | 118 | |
a6ccbbb8 N |
119 | static void |
120 | nfsd4_sync_rec_dir(void) | |
c7b9a459 | 121 | { |
f501912a | 122 | vfs_fsync(NULL, rec_dir.dentry, 0); |
c7b9a459 N |
123 | } |
124 | ||
125 | int | |
126 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
127 | { | |
d84f4f99 | 128 | const struct cred *original_cred; |
c7b9a459 N |
129 | char *dname = clp->cl_recdir; |
130 | struct dentry *dentry; | |
c7b9a459 N |
131 | int status; |
132 | ||
133 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
134 | ||
135 | if (!rec_dir_init || clp->cl_firststate) | |
136 | return 0; | |
137 | ||
d84f4f99 DH |
138 | status = nfs4_save_creds(&original_cred); |
139 | if (status < 0) | |
140 | return status; | |
c7b9a459 N |
141 | |
142 | /* lock the parent */ | |
a63bb996 | 143 | mutex_lock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 | 144 | |
a63bb996 | 145 | dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1); |
c7b9a459 N |
146 | if (IS_ERR(dentry)) { |
147 | status = PTR_ERR(dentry); | |
148 | goto out_unlock; | |
149 | } | |
150 | status = -EEXIST; | |
151 | if (dentry->d_inode) { | |
152 | dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n"); | |
153 | goto out_put; | |
154 | } | |
a63bb996 | 155 | status = mnt_want_write(rec_dir.mnt); |
463c3197 DH |
156 | if (status) |
157 | goto out_put; | |
a63bb996 AV |
158 | status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU); |
159 | mnt_drop_write(rec_dir.mnt); | |
c7b9a459 N |
160 | out_put: |
161 | dput(dentry); | |
162 | out_unlock: | |
a63bb996 | 163 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); |
c7b9a459 N |
164 | if (status == 0) { |
165 | clp->cl_firststate = 1; | |
a6ccbbb8 | 166 | nfsd4_sync_rec_dir(); |
c7b9a459 | 167 | } |
d84f4f99 | 168 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
169 | dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status); |
170 | return status; | |
171 | } | |
172 | ||
190e4fbf N |
173 | typedef int (recdir_func)(struct dentry *, struct dentry *); |
174 | ||
05f4f678 BF |
175 | struct name_list { |
176 | char name[HEXDIR_LEN]; | |
190e4fbf N |
177 | struct list_head list; |
178 | }; | |
179 | ||
190e4fbf | 180 | static int |
05f4f678 | 181 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 182 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 183 | { |
05f4f678 BF |
184 | struct list_head *names = arg; |
185 | struct name_list *entry; | |
190e4fbf | 186 | |
05f4f678 | 187 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 188 | return 0; |
05f4f678 BF |
189 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
190 | if (entry == NULL) | |
190e4fbf | 191 | return -ENOMEM; |
05f4f678 BF |
192 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
193 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
194 | list_add(&entry->list, names); | |
190e4fbf N |
195 | return 0; |
196 | } | |
197 | ||
198 | static int | |
199 | nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f) | |
200 | { | |
d84f4f99 | 201 | const struct cred *original_cred; |
190e4fbf | 202 | struct file *filp; |
05f4f678 BF |
203 | LIST_HEAD(names); |
204 | struct name_list *entry; | |
205 | struct dentry *dentry; | |
190e4fbf N |
206 | int status; |
207 | ||
208 | if (!rec_dir_init) | |
209 | return 0; | |
210 | ||
d84f4f99 DH |
211 | status = nfs4_save_creds(&original_cred); |
212 | if (status < 0) | |
213 | return status; | |
190e4fbf | 214 | |
745ca247 DH |
215 | filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY, |
216 | current_cred()); | |
190e4fbf N |
217 | status = PTR_ERR(filp); |
218 | if (IS_ERR(filp)) | |
219 | goto out; | |
05f4f678 | 220 | status = vfs_readdir(filp, nfsd4_build_namelist, &names); |
190e4fbf | 221 | fput(filp); |
8daed1e5 | 222 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
05f4f678 BF |
223 | while (!list_empty(&names)) { |
224 | entry = list_entry(names.next, struct name_list, list); | |
225 | ||
226 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
227 | if (IS_ERR(dentry)) { | |
228 | status = PTR_ERR(dentry); | |
2f9092e1 | 229 | break; |
05f4f678 BF |
230 | } |
231 | status = f(dir, dentry); | |
232 | dput(dentry); | |
190e4fbf | 233 | if (status) |
2f9092e1 | 234 | break; |
05f4f678 BF |
235 | list_del(&entry->list); |
236 | kfree(entry); | |
190e4fbf | 237 | } |
2f9092e1 | 238 | mutex_unlock(&dir->d_inode->i_mutex); |
190e4fbf | 239 | out: |
05f4f678 BF |
240 | while (!list_empty(&names)) { |
241 | entry = list_entry(names.next, struct name_list, list); | |
242 | list_del(&entry->list); | |
243 | kfree(entry); | |
190e4fbf | 244 | } |
d84f4f99 | 245 | nfs4_reset_creds(original_cred); |
190e4fbf N |
246 | return status; |
247 | } | |
248 | ||
c7b9a459 N |
249 | static int |
250 | nfsd4_unlink_clid_dir(char *name, int namlen) | |
251 | { | |
252 | struct dentry *dentry; | |
253 | int status; | |
254 | ||
255 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
256 | ||
8daed1e5 | 257 | mutex_lock_nested(&rec_dir.dentry->d_inode->i_mutex, I_MUTEX_PARENT); |
a63bb996 | 258 | dentry = lookup_one_len(name, rec_dir.dentry, namlen); |
c7b9a459 N |
259 | if (IS_ERR(dentry)) { |
260 | status = PTR_ERR(dentry); | |
2f9092e1 | 261 | goto out_unlock; |
c7b9a459 N |
262 | } |
263 | status = -ENOENT; | |
264 | if (!dentry->d_inode) | |
265 | goto out; | |
2f9092e1 | 266 | status = vfs_rmdir(rec_dir.dentry->d_inode, dentry); |
c7b9a459 N |
267 | out: |
268 | dput(dentry); | |
2f9092e1 DW |
269 | out_unlock: |
270 | mutex_unlock(&rec_dir.dentry->d_inode->i_mutex); | |
c7b9a459 N |
271 | return status; |
272 | } | |
273 | ||
274 | void | |
275 | nfsd4_remove_clid_dir(struct nfs4_client *clp) | |
276 | { | |
d84f4f99 | 277 | const struct cred *original_cred; |
c7b9a459 N |
278 | int status; |
279 | ||
280 | if (!rec_dir_init || !clp->cl_firststate) | |
281 | return; | |
282 | ||
a63bb996 | 283 | status = mnt_want_write(rec_dir.mnt); |
0622753b DH |
284 | if (status) |
285 | goto out; | |
67be4313 | 286 | clp->cl_firststate = 0; |
d84f4f99 DH |
287 | |
288 | status = nfs4_save_creds(&original_cred); | |
289 | if (status < 0) | |
290 | goto out; | |
291 | ||
c7b9a459 | 292 | status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1); |
d84f4f99 | 293 | nfs4_reset_creds(original_cred); |
c7b9a459 | 294 | if (status == 0) |
a6ccbbb8 | 295 | nfsd4_sync_rec_dir(); |
a63bb996 | 296 | mnt_drop_write(rec_dir.mnt); |
0622753b | 297 | out: |
c7b9a459 N |
298 | if (status) |
299 | printk("NFSD: Failed to remove expired client state directory" | |
300 | " %.*s\n", HEXDIR_LEN, clp->cl_recdir); | |
301 | return; | |
302 | } | |
303 | ||
304 | static int | |
305 | purge_old(struct dentry *parent, struct dentry *child) | |
306 | { | |
307 | int status; | |
308 | ||
a1bcecd2 AA |
309 | /* note: we currently use this path only for minorversion 0 */ |
310 | if (nfs4_has_reclaimed_state(child->d_name.name, false)) | |
b37ad28b | 311 | return 0; |
c7b9a459 | 312 | |
2f9092e1 | 313 | status = vfs_rmdir(parent->d_inode, child); |
c7b9a459 N |
314 | if (status) |
315 | printk("failed to remove client recovery directory %s\n", | |
316 | child->d_name.name); | |
317 | /* Keep trying, success or failure: */ | |
b37ad28b | 318 | return 0; |
c7b9a459 N |
319 | } |
320 | ||
321 | void | |
322 | nfsd4_recdir_purge_old(void) { | |
323 | int status; | |
324 | ||
325 | if (!rec_dir_init) | |
326 | return; | |
a63bb996 | 327 | status = mnt_want_write(rec_dir.mnt); |
0622753b DH |
328 | if (status) |
329 | goto out; | |
a63bb996 | 330 | status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old); |
c7b9a459 | 331 | if (status == 0) |
a6ccbbb8 | 332 | nfsd4_sync_rec_dir(); |
a63bb996 | 333 | mnt_drop_write(rec_dir.mnt); |
0622753b | 334 | out: |
c7b9a459 N |
335 | if (status) |
336 | printk("nfsd4: failed to purge old clients from recovery" | |
a63bb996 | 337 | " directory %s\n", rec_dir.dentry->d_name.name); |
c7b9a459 N |
338 | } |
339 | ||
190e4fbf N |
340 | static int |
341 | load_recdir(struct dentry *parent, struct dentry *child) | |
342 | { | |
343 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
344 | printk("nfsd4: illegal name %s in recovery directory\n", | |
345 | child->d_name.name); | |
346 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 347 | return 0; |
190e4fbf N |
348 | } |
349 | nfs4_client_to_reclaim(child->d_name.name); | |
b37ad28b | 350 | return 0; |
190e4fbf N |
351 | } |
352 | ||
353 | int | |
354 | nfsd4_recdir_load(void) { | |
355 | int status; | |
356 | ||
a63bb996 | 357 | status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir); |
190e4fbf N |
358 | if (status) |
359 | printk("nfsd4: failed loading clients from recovery" | |
a63bb996 | 360 | " directory %s\n", rec_dir.dentry->d_name.name); |
190e4fbf N |
361 | return status; |
362 | } | |
363 | ||
364 | /* | |
365 | * Hold reference to the recovery directory. | |
366 | */ | |
367 | ||
368 | void | |
369 | nfsd4_init_recdir(char *rec_dirname) | |
370 | { | |
d84f4f99 DH |
371 | const struct cred *original_cred; |
372 | int status; | |
190e4fbf N |
373 | |
374 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
375 | rec_dirname); | |
376 | ||
377 | BUG_ON(rec_dir_init); | |
378 | ||
d84f4f99 DH |
379 | status = nfs4_save_creds(&original_cred); |
380 | if (status < 0) { | |
381 | printk("NFSD: Unable to change credentials to find recovery" | |
382 | " directory: error %d\n", | |
383 | status); | |
384 | return; | |
385 | } | |
190e4fbf | 386 | |
a63bb996 | 387 | status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, |
c2642ab0 BF |
388 | &rec_dir); |
389 | if (status) | |
390 | printk("NFSD: unable to find recovery directory %s\n", | |
190e4fbf N |
391 | rec_dirname); |
392 | ||
393 | if (!status) | |
394 | rec_dir_init = 1; | |
d84f4f99 | 395 | nfs4_reset_creds(original_cred); |
190e4fbf N |
396 | } |
397 | ||
398 | void | |
399 | nfsd4_shutdown_recdir(void) | |
400 | { | |
401 | if (!rec_dir_init) | |
402 | return; | |
403 | rec_dir_init = 0; | |
a63bb996 | 404 | path_put(&rec_dir); |
190e4fbf | 405 | } |