Commit | Line | Data |
---|---|---|
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 | 34 | #include <linux/file.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
190e4fbf | 36 | #include <linux/namei.h> |
a55370a3 | 37 | #include <linux/crypto.h> |
e8edc6e0 | 38 | #include <linux/sched.h> |
9a74af21 BH |
39 | |
40 | #include "nfsd.h" | |
41 | #include "state.h" | |
0a3adade | 42 | #include "vfs.h" |
a55370a3 N |
43 | |
44 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
45 | ||
190e4fbf | 46 | /* Globals */ |
e970a573 | 47 | static struct file *rec_file; |
48483bf2 | 48 | static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; |
190e4fbf | 49 | |
d84f4f99 DH |
50 | static int |
51 | nfs4_save_creds(const struct cred **original_creds) | |
190e4fbf | 52 | { |
d84f4f99 DH |
53 | struct cred *new; |
54 | ||
55 | new = prepare_creds(); | |
56 | if (!new) | |
57 | return -ENOMEM; | |
58 | ||
59 | new->fsuid = 0; | |
60 | new->fsgid = 0; | |
61 | *original_creds = override_creds(new); | |
62 | put_cred(new); | |
63 | return 0; | |
190e4fbf N |
64 | } |
65 | ||
66 | static void | |
d84f4f99 | 67 | nfs4_reset_creds(const struct cred *original) |
190e4fbf | 68 | { |
d84f4f99 | 69 | revert_creds(original); |
190e4fbf N |
70 | } |
71 | ||
a55370a3 N |
72 | static void |
73 | md5_to_hex(char *out, char *md5) | |
74 | { | |
75 | int i; | |
76 | ||
77 | for (i=0; i<16; i++) { | |
78 | unsigned char c = md5[i]; | |
79 | ||
80 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
81 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
82 | } | |
83 | *out = '\0'; | |
84 | } | |
85 | ||
b37ad28b | 86 | __be32 |
a55370a3 N |
87 | nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname) |
88 | { | |
89 | struct xdr_netobj cksum; | |
35058687 | 90 | struct hash_desc desc; |
60c74f81 | 91 | struct scatterlist sg; |
3e772463 | 92 | __be32 status = nfserr_jukebox; |
a55370a3 N |
93 | |
94 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
95 | clname->len, clname->data); | |
35058687 HX |
96 | desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
97 | desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); | |
98 | if (IS_ERR(desc.tfm)) | |
99 | goto out_no_tfm; | |
100 | cksum.len = crypto_hash_digestsize(desc.tfm); | |
a55370a3 N |
101 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
102 | if (cksum.data == NULL) | |
103 | goto out; | |
a55370a3 | 104 | |
60c74f81 | 105 | sg_init_one(&sg, clname->data, clname->len); |
a55370a3 | 106 | |
60c74f81 | 107 | if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data)) |
35058687 | 108 | goto out; |
a55370a3 N |
109 | |
110 | md5_to_hex(dname, cksum.data); | |
111 | ||
a55370a3 N |
112 | status = nfs_ok; |
113 | out: | |
2bd9e7b6 | 114 | kfree(cksum.data); |
35058687 HX |
115 | crypto_free_hash(desc.tfm); |
116 | out_no_tfm: | |
a55370a3 N |
117 | return status; |
118 | } | |
190e4fbf | 119 | |
c7b9a459 N |
120 | int |
121 | nfsd4_create_clid_dir(struct nfs4_client *clp) | |
122 | { | |
d84f4f99 | 123 | const struct cred *original_cred; |
c7b9a459 | 124 | char *dname = clp->cl_recdir; |
e970a573 | 125 | struct dentry *dir, *dentry; |
c7b9a459 N |
126 | int status; |
127 | ||
128 | dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname); | |
129 | ||
e970a573 | 130 | if (!rec_file || clp->cl_firststate) |
c7b9a459 N |
131 | return 0; |
132 | ||
6577aac0 | 133 | clp->cl_firststate = 1; |
d84f4f99 DH |
134 | status = nfs4_save_creds(&original_cred); |
135 | if (status < 0) | |
136 | return status; | |
c7b9a459 | 137 | |
e970a573 | 138 | dir = rec_file->f_path.dentry; |
c7b9a459 | 139 | /* lock the parent */ |
e970a573 | 140 | mutex_lock(&dir->d_inode->i_mutex); |
c7b9a459 | 141 | |
e970a573 | 142 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
c7b9a459 N |
143 | if (IS_ERR(dentry)) { |
144 | status = PTR_ERR(dentry); | |
145 | goto out_unlock; | |
146 | } | |
147 | status = -EEXIST; | |
6577aac0 | 148 | if (dentry->d_inode) |
c7b9a459 | 149 | goto out_put; |
a561be71 | 150 | status = mnt_want_write_file(rec_file); |
463c3197 DH |
151 | if (status) |
152 | goto out_put; | |
e970a573 | 153 | status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU); |
2a79f17e | 154 | mnt_drop_write_file(rec_file); |
c7b9a459 N |
155 | out_put: |
156 | dput(dentry); | |
157 | out_unlock: | |
e970a573 | 158 | mutex_unlock(&dir->d_inode->i_mutex); |
6577aac0 | 159 | if (status == 0) |
8018ab05 | 160 | vfs_fsync(rec_file, 0); |
6577aac0 BH |
161 | else |
162 | printk(KERN_ERR "NFSD: failed to write recovery record" | |
163 | " (err %d); please check that %s exists" | |
164 | " and is writeable", status, | |
165 | user_recovery_dirname); | |
d84f4f99 | 166 | nfs4_reset_creds(original_cred); |
c7b9a459 N |
167 | return status; |
168 | } | |
169 | ||
190e4fbf N |
170 | typedef int (recdir_func)(struct dentry *, struct dentry *); |
171 | ||
05f4f678 BF |
172 | struct name_list { |
173 | char name[HEXDIR_LEN]; | |
190e4fbf N |
174 | struct list_head list; |
175 | }; | |
176 | ||
190e4fbf | 177 | static int |
05f4f678 | 178 | nfsd4_build_namelist(void *arg, const char *name, int namlen, |
afefdbb2 | 179 | loff_t offset, u64 ino, unsigned int d_type) |
190e4fbf | 180 | { |
05f4f678 BF |
181 | struct list_head *names = arg; |
182 | struct name_list *entry; | |
190e4fbf | 183 | |
05f4f678 | 184 | if (namlen != HEXDIR_LEN - 1) |
b37ad28b | 185 | return 0; |
05f4f678 BF |
186 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
187 | if (entry == NULL) | |
190e4fbf | 188 | return -ENOMEM; |
05f4f678 BF |
189 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
190 | entry->name[HEXDIR_LEN - 1] = '\0'; | |
191 | list_add(&entry->list, names); | |
190e4fbf N |
192 | return 0; |
193 | } | |
194 | ||
195 | static int | |
5b4b299c | 196 | nfsd4_list_rec_dir(recdir_func *f) |
190e4fbf | 197 | { |
d84f4f99 | 198 | const struct cred *original_cred; |
5b4b299c | 199 | struct dentry *dir = rec_file->f_path.dentry; |
05f4f678 | 200 | LIST_HEAD(names); |
190e4fbf N |
201 | int status; |
202 | ||
d84f4f99 DH |
203 | status = nfs4_save_creds(&original_cred); |
204 | if (status < 0) | |
205 | return status; | |
190e4fbf | 206 | |
5b4b299c AV |
207 | status = vfs_llseek(rec_file, 0, SEEK_SET); |
208 | if (status < 0) { | |
209 | nfs4_reset_creds(original_cred); | |
210 | return status; | |
211 | } | |
212 | ||
213 | status = vfs_readdir(rec_file, nfsd4_build_namelist, &names); | |
8daed1e5 | 214 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); |
05f4f678 | 215 | while (!list_empty(&names)) { |
5b4b299c | 216 | struct name_list *entry; |
05f4f678 | 217 | entry = list_entry(names.next, struct name_list, list); |
5b4b299c AV |
218 | if (!status) { |
219 | struct dentry *dentry; | |
220 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); | |
221 | if (IS_ERR(dentry)) { | |
222 | status = PTR_ERR(dentry); | |
223 | break; | |
224 | } | |
225 | status = f(dir, dentry); | |
226 | dput(dentry); | |
05f4f678 | 227 | } |
05f4f678 BF |
228 | list_del(&entry->list); |
229 | kfree(entry); | |
190e4fbf | 230 | } |
2f9092e1 | 231 | mutex_unlock(&dir->d_inode->i_mutex); |
d84f4f99 | 232 | nfs4_reset_creds(original_cred); |
190e4fbf N |
233 | return status; |
234 | } | |
235 | ||
c7b9a459 N |
236 | static int |
237 | nfsd4_unlink_clid_dir(char *name, int namlen) | |
238 | { | |
e970a573 | 239 | struct dentry *dir, *dentry; |
c7b9a459 N |
240 | int status; |
241 | ||
242 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); | |
243 | ||
e970a573 CH |
244 | dir = rec_file->f_path.dentry; |
245 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT); | |
246 | dentry = lookup_one_len(name, dir, namlen); | |
c7b9a459 N |
247 | if (IS_ERR(dentry)) { |
248 | status = PTR_ERR(dentry); | |
2f9092e1 | 249 | goto out_unlock; |
c7b9a459 N |
250 | } |
251 | status = -ENOENT; | |
252 | if (!dentry->d_inode) | |
253 | goto out; | |
e970a573 | 254 | status = vfs_rmdir(dir->d_inode, dentry); |
c7b9a459 N |
255 | out: |
256 | dput(dentry); | |
2f9092e1 | 257 | out_unlock: |
e970a573 | 258 | mutex_unlock(&dir->d_inode->i_mutex); |
c7b9a459 N |
259 | return status; |
260 | } | |
261 | ||
262 | void | |
263 | nfsd4_remove_clid_dir(struct nfs4_client *clp) | |
264 | { | |
d84f4f99 | 265 | const struct cred *original_cred; |
c7b9a459 N |
266 | int status; |
267 | ||
e970a573 | 268 | if (!rec_file || !clp->cl_firststate) |
c7b9a459 N |
269 | return; |
270 | ||
a561be71 | 271 | status = mnt_want_write_file(rec_file); |
0622753b DH |
272 | if (status) |
273 | goto out; | |
67be4313 | 274 | clp->cl_firststate = 0; |
d84f4f99 DH |
275 | |
276 | status = nfs4_save_creds(&original_cred); | |
277 | if (status < 0) | |
278 | goto out; | |
279 | ||
c7b9a459 | 280 | status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1); |
d84f4f99 | 281 | nfs4_reset_creds(original_cred); |
c7b9a459 | 282 | if (status == 0) |
8018ab05 | 283 | vfs_fsync(rec_file, 0); |
2a79f17e | 284 | mnt_drop_write_file(rec_file); |
0622753b | 285 | out: |
c7b9a459 N |
286 | if (status) |
287 | printk("NFSD: Failed to remove expired client state directory" | |
288 | " %.*s\n", HEXDIR_LEN, clp->cl_recdir); | |
289 | return; | |
290 | } | |
291 | ||
292 | static int | |
293 | purge_old(struct dentry *parent, struct dentry *child) | |
294 | { | |
295 | int status; | |
296 | ||
a1bcecd2 | 297 | if (nfs4_has_reclaimed_state(child->d_name.name, false)) |
b37ad28b | 298 | return 0; |
c7b9a459 | 299 | |
2f9092e1 | 300 | status = vfs_rmdir(parent->d_inode, child); |
c7b9a459 N |
301 | if (status) |
302 | printk("failed to remove client recovery directory %s\n", | |
303 | child->d_name.name); | |
304 | /* Keep trying, success or failure: */ | |
b37ad28b | 305 | return 0; |
c7b9a459 N |
306 | } |
307 | ||
308 | void | |
309 | nfsd4_recdir_purge_old(void) { | |
310 | int status; | |
311 | ||
e970a573 | 312 | if (!rec_file) |
c7b9a459 | 313 | return; |
a561be71 | 314 | status = mnt_want_write_file(rec_file); |
0622753b DH |
315 | if (status) |
316 | goto out; | |
5b4b299c | 317 | status = nfsd4_list_rec_dir(purge_old); |
c7b9a459 | 318 | if (status == 0) |
8018ab05 | 319 | vfs_fsync(rec_file, 0); |
2a79f17e | 320 | mnt_drop_write_file(rec_file); |
0622753b | 321 | out: |
c7b9a459 N |
322 | if (status) |
323 | printk("nfsd4: failed to purge old clients from recovery" | |
e970a573 | 324 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
c7b9a459 N |
325 | } |
326 | ||
190e4fbf N |
327 | static int |
328 | load_recdir(struct dentry *parent, struct dentry *child) | |
329 | { | |
330 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
331 | printk("nfsd4: illegal name %s in recovery directory\n", | |
332 | child->d_name.name); | |
333 | /* Keep trying; maybe the others are OK: */ | |
b37ad28b | 334 | return 0; |
190e4fbf N |
335 | } |
336 | nfs4_client_to_reclaim(child->d_name.name); | |
b37ad28b | 337 | return 0; |
190e4fbf N |
338 | } |
339 | ||
340 | int | |
341 | nfsd4_recdir_load(void) { | |
342 | int status; | |
343 | ||
e970a573 CH |
344 | if (!rec_file) |
345 | return 0; | |
346 | ||
5b4b299c | 347 | status = nfsd4_list_rec_dir(load_recdir); |
190e4fbf N |
348 | if (status) |
349 | printk("nfsd4: failed loading clients from recovery" | |
e970a573 | 350 | " directory %s\n", rec_file->f_path.dentry->d_name.name); |
190e4fbf N |
351 | return status; |
352 | } | |
353 | ||
354 | /* | |
355 | * Hold reference to the recovery directory. | |
356 | */ | |
357 | ||
358 | void | |
48483bf2 | 359 | nfsd4_init_recdir() |
190e4fbf | 360 | { |
d84f4f99 DH |
361 | const struct cred *original_cred; |
362 | int status; | |
190e4fbf N |
363 | |
364 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
48483bf2 | 365 | user_recovery_dirname); |
190e4fbf | 366 | |
e970a573 | 367 | BUG_ON(rec_file); |
190e4fbf | 368 | |
d84f4f99 DH |
369 | status = nfs4_save_creds(&original_cred); |
370 | if (status < 0) { | |
371 | printk("NFSD: Unable to change credentials to find recovery" | |
372 | " directory: error %d\n", | |
373 | status); | |
374 | return; | |
375 | } | |
190e4fbf | 376 | |
48483bf2 | 377 | rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
e970a573 | 378 | if (IS_ERR(rec_file)) { |
c2642ab0 | 379 | printk("NFSD: unable to find recovery directory %s\n", |
48483bf2 | 380 | user_recovery_dirname); |
e970a573 CH |
381 | rec_file = NULL; |
382 | } | |
190e4fbf | 383 | |
d84f4f99 | 384 | nfs4_reset_creds(original_cred); |
190e4fbf N |
385 | } |
386 | ||
387 | void | |
388 | nfsd4_shutdown_recdir(void) | |
389 | { | |
e970a573 | 390 | if (!rec_file) |
190e4fbf | 391 | return; |
e970a573 CH |
392 | fput(rec_file); |
393 | rec_file = NULL; | |
190e4fbf | 394 | } |
48483bf2 BF |
395 | |
396 | /* | |
397 | * Change the NFSv4 recovery directory to recdir. | |
398 | */ | |
399 | int | |
400 | nfs4_reset_recoverydir(char *recdir) | |
401 | { | |
402 | int status; | |
403 | struct path path; | |
404 | ||
405 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); | |
406 | if (status) | |
407 | return status; | |
408 | status = -ENOTDIR; | |
409 | if (S_ISDIR(path.dentry->d_inode->i_mode)) { | |
410 | strcpy(user_recovery_dirname, recdir); | |
411 | status = 0; | |
412 | } | |
413 | path_put(&path); | |
414 | return status; | |
415 | } | |
416 | ||
417 | char * | |
418 | nfs4_recoverydir(void) | |
419 | { | |
420 | return user_recovery_dirname; | |
421 | } |