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a55370a3 N |
1 | /* |
2 | * linux/fs/nfsd/nfs4recover.c | |
3 | * | |
4 | * Copyright (c) 2004 The Regents of the University of Michigan. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Andy Adamson <andros@citi.umich.edu> | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * 3. Neither the name of the University nor the names of its | |
19 | * contributors may be used to endorse or promote products derived | |
20 | * from this software without specific prior written permission. | |
21 | * | |
22 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
25 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
27 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
28 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
29 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
30 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
31 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
32 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | * | |
34 | */ | |
35 | ||
36 | ||
37 | #include <linux/sunrpc/svc.h> | |
38 | #include <linux/nfsd/nfsd.h> | |
39 | #include <linux/nfs4.h> | |
40 | #include <linux/nfsd/state.h> | |
41 | #include <linux/nfsd/xdr4.h> | |
190e4fbf N |
42 | #include <linux/param.h> |
43 | #include <linux/file.h> | |
44 | #include <linux/namei.h> | |
a55370a3 N |
45 | #include <asm/uaccess.h> |
46 | #include <asm/scatterlist.h> | |
47 | #include <linux/crypto.h> | |
48 | ||
49 | ||
50 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
51 | ||
190e4fbf N |
52 | /* Globals */ |
53 | char recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; | |
54 | static struct nameidata rec_dir; | |
55 | static int rec_dir_init = 0; | |
56 | ||
57 | static void | |
58 | nfs4_save_user(uid_t *saveuid, gid_t *savegid) | |
59 | { | |
60 | *saveuid = current->fsuid; | |
61 | *savegid = current->fsgid; | |
62 | current->fsuid = 0; | |
63 | current->fsgid = 0; | |
64 | } | |
65 | ||
66 | static void | |
67 | nfs4_reset_user(uid_t saveuid, gid_t savegid) | |
68 | { | |
69 | current->fsuid = saveuid; | |
70 | current->fsgid = savegid; | |
71 | } | |
72 | ||
a55370a3 N |
73 | static void |
74 | md5_to_hex(char *out, char *md5) | |
75 | { | |
76 | int i; | |
77 | ||
78 | for (i=0; i<16; i++) { | |
79 | unsigned char c = md5[i]; | |
80 | ||
81 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); | |
82 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); | |
83 | } | |
84 | *out = '\0'; | |
85 | } | |
86 | ||
87 | int | |
88 | nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname) | |
89 | { | |
90 | struct xdr_netobj cksum; | |
91 | struct crypto_tfm *tfm; | |
92 | struct scatterlist sg[1]; | |
93 | int status = nfserr_resource; | |
94 | ||
95 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", | |
96 | clname->len, clname->data); | |
97 | tfm = crypto_alloc_tfm("md5", 0); | |
98 | if (tfm == NULL) | |
99 | goto out; | |
100 | cksum.len = crypto_tfm_alg_digestsize(tfm); | |
101 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); | |
102 | if (cksum.data == NULL) | |
103 | goto out; | |
104 | crypto_digest_init(tfm); | |
105 | ||
106 | sg[0].page = virt_to_page(clname->data); | |
107 | sg[0].offset = offset_in_page(clname->data); | |
108 | sg[0].length = clname->len; | |
109 | ||
110 | crypto_digest_update(tfm, sg, 1); | |
111 | crypto_digest_final(tfm, cksum.data); | |
112 | ||
113 | md5_to_hex(dname, cksum.data); | |
114 | ||
115 | kfree(cksum.data); | |
116 | status = nfs_ok; | |
117 | out: | |
118 | if (tfm) | |
119 | crypto_free_tfm(tfm); | |
120 | return status; | |
121 | } | |
190e4fbf N |
122 | |
123 | typedef int (recdir_func)(struct dentry *, struct dentry *); | |
124 | ||
125 | struct dentry_list { | |
126 | struct dentry *dentry; | |
127 | struct list_head list; | |
128 | }; | |
129 | ||
130 | struct dentry_list_arg { | |
131 | struct list_head dentries; | |
132 | struct dentry *parent; | |
133 | }; | |
134 | ||
135 | static int | |
136 | nfsd4_build_dentrylist(void *arg, const char *name, int namlen, | |
137 | loff_t offset, ino_t ino, unsigned int d_type) | |
138 | { | |
139 | struct dentry_list_arg *dla = arg; | |
140 | struct list_head *dentries = &dla->dentries; | |
141 | struct dentry *parent = dla->parent; | |
142 | struct dentry *dentry; | |
143 | struct dentry_list *child; | |
144 | ||
145 | if (name && isdotent(name, namlen)) | |
146 | return nfs_ok; | |
147 | dentry = lookup_one_len(name, parent, namlen); | |
148 | if (IS_ERR(dentry)) | |
149 | return PTR_ERR(dentry); | |
150 | child = kmalloc(sizeof(*child), GFP_KERNEL); | |
151 | if (child == NULL) | |
152 | return -ENOMEM; | |
153 | child->dentry = dentry; | |
154 | list_add(&child->list, dentries); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | static int | |
159 | nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f) | |
160 | { | |
161 | struct file *filp; | |
162 | struct dentry_list_arg dla = { | |
163 | .parent = dir, | |
164 | }; | |
165 | struct list_head *dentries = &dla.dentries; | |
166 | struct dentry_list *child; | |
167 | uid_t uid; | |
168 | gid_t gid; | |
169 | int status; | |
170 | ||
171 | if (!rec_dir_init) | |
172 | return 0; | |
173 | ||
174 | nfs4_save_user(&uid, &gid); | |
175 | ||
176 | filp = dentry_open(dget(dir), mntget(rec_dir.mnt), | |
177 | O_RDWR); | |
178 | status = PTR_ERR(filp); | |
179 | if (IS_ERR(filp)) | |
180 | goto out; | |
181 | INIT_LIST_HEAD(dentries); | |
182 | status = vfs_readdir(filp, nfsd4_build_dentrylist, &dla); | |
183 | fput(filp); | |
184 | while (!list_empty(dentries)) { | |
185 | child = list_entry(dentries->next, struct dentry_list, list); | |
186 | status = f(dir, child->dentry); | |
187 | if (status) | |
188 | goto out; | |
189 | list_del(&child->list); | |
190 | dput(child->dentry); | |
191 | kfree(child); | |
192 | } | |
193 | out: | |
194 | while (!list_empty(dentries)) { | |
195 | child = list_entry(dentries->next, struct dentry_list, list); | |
196 | list_del(&child->list); | |
197 | dput(child->dentry); | |
198 | kfree(child); | |
199 | } | |
200 | nfs4_reset_user(uid, gid); | |
201 | return status; | |
202 | } | |
203 | ||
204 | static int | |
205 | load_recdir(struct dentry *parent, struct dentry *child) | |
206 | { | |
207 | if (child->d_name.len != HEXDIR_LEN - 1) { | |
208 | printk("nfsd4: illegal name %s in recovery directory\n", | |
209 | child->d_name.name); | |
210 | /* Keep trying; maybe the others are OK: */ | |
211 | return nfs_ok; | |
212 | } | |
213 | nfs4_client_to_reclaim(child->d_name.name); | |
214 | return nfs_ok; | |
215 | } | |
216 | ||
217 | int | |
218 | nfsd4_recdir_load(void) { | |
219 | int status; | |
220 | ||
221 | status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir); | |
222 | if (status) | |
223 | printk("nfsd4: failed loading clients from recovery" | |
224 | " directory %s\n", rec_dir.dentry->d_name.name); | |
225 | return status; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Hold reference to the recovery directory. | |
230 | */ | |
231 | ||
232 | void | |
233 | nfsd4_init_recdir(char *rec_dirname) | |
234 | { | |
235 | uid_t uid = 0; | |
236 | gid_t gid = 0; | |
237 | int status; | |
238 | ||
239 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", | |
240 | rec_dirname); | |
241 | ||
242 | BUG_ON(rec_dir_init); | |
243 | ||
244 | nfs4_save_user(&uid, &gid); | |
245 | ||
246 | status = path_lookup(rec_dirname, LOOKUP_FOLLOW, &rec_dir); | |
247 | if (status == -ENOENT) | |
248 | printk("NFSD: recovery directory %s doesn't exist\n", | |
249 | rec_dirname); | |
250 | ||
251 | if (!status) | |
252 | rec_dir_init = 1; | |
253 | nfs4_reset_user(uid, gid); | |
254 | } | |
255 | ||
256 | void | |
257 | nfsd4_shutdown_recdir(void) | |
258 | { | |
259 | if (!rec_dir_init) | |
260 | return; | |
261 | rec_dir_init = 0; | |
262 | path_release(&rec_dir); | |
263 | } |