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237fead6 MH |
1 | /** |
2 | * eCryptfs: Linux filesystem encryption layer | |
3 | * | |
4 | * Copyright (C) 1997-2003 Erez Zadok | |
5 | * Copyright (C) 2001-2003 Stony Brook University | |
dd2a3b7a | 6 | * Copyright (C) 2004-2007 International Business Machines Corp. |
237fead6 MH |
7 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
8 | * Michael C. Thompson <mcthomps@us.ibm.com> | |
dddfa461 | 9 | * Tyler Hicks <tyhicks@ou.edu> |
237fead6 MH |
10 | * |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License as | |
13 | * published by the Free Software Foundation; either version 2 of the | |
14 | * License, or (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, but | |
17 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
24 | * 02111-1307, USA. | |
25 | */ | |
26 | ||
27 | #include <linux/dcache.h> | |
28 | #include <linux/file.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/namei.h> | |
31 | #include <linux/skbuff.h> | |
32 | #include <linux/crypto.h> | |
237fead6 | 33 | #include <linux/mount.h> |
237fead6 MH |
34 | #include <linux/pagemap.h> |
35 | #include <linux/key.h> | |
36 | #include <linux/parser.h> | |
0cc72dc7 | 37 | #include <linux/fs_stack.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
237fead6 MH |
39 | #include "ecryptfs_kernel.h" |
40 | ||
41 | /** | |
42 | * Module parameter that defines the ecryptfs_verbosity level. | |
43 | */ | |
44 | int ecryptfs_verbosity = 0; | |
45 | ||
46 | module_param(ecryptfs_verbosity, int, 0); | |
47 | MODULE_PARM_DESC(ecryptfs_verbosity, | |
48 | "Initial verbosity level (0 or 1; defaults to " | |
49 | "0, which is Quiet)"); | |
50 | ||
dddfa461 | 51 | /** |
624ae528 | 52 | * Module parameter that defines the number of message buffer elements |
dddfa461 MH |
53 | */ |
54 | unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS; | |
55 | ||
56 | module_param(ecryptfs_message_buf_len, uint, 0); | |
57 | MODULE_PARM_DESC(ecryptfs_message_buf_len, | |
58 | "Number of message buffer elements"); | |
59 | ||
60 | /** | |
61 | * Module parameter that defines the maximum guaranteed amount of time to wait | |
624ae528 | 62 | * for a response from ecryptfsd. The actual sleep time will be, more than |
dddfa461 | 63 | * likely, a small amount greater than this specified value, but only less if |
624ae528 | 64 | * the message successfully arrives. |
dddfa461 MH |
65 | */ |
66 | signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ; | |
67 | ||
68 | module_param(ecryptfs_message_wait_timeout, long, 0); | |
69 | MODULE_PARM_DESC(ecryptfs_message_wait_timeout, | |
70 | "Maximum number of seconds that an operation will " | |
71 | "sleep while waiting for a message response from " | |
72 | "userspace"); | |
73 | ||
74 | /** | |
75 | * Module parameter that is an estimate of the maximum number of users | |
76 | * that will be concurrently using eCryptfs. Set this to the right | |
77 | * value to balance performance and memory use. | |
78 | */ | |
79 | unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS; | |
80 | ||
81 | module_param(ecryptfs_number_of_users, uint, 0); | |
82 | MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of " | |
83 | "concurrent users of eCryptfs"); | |
84 | ||
237fead6 MH |
85 | void __ecryptfs_printk(const char *fmt, ...) |
86 | { | |
87 | va_list args; | |
88 | va_start(args, fmt); | |
89 | if (fmt[1] == '7') { /* KERN_DEBUG */ | |
90 | if (ecryptfs_verbosity >= 1) | |
91 | vprintk(fmt, args); | |
92 | } else | |
93 | vprintk(fmt, args); | |
94 | va_end(args); | |
95 | } | |
96 | ||
4981e081 MH |
97 | /** |
98 | * ecryptfs_init_persistent_file | |
99 | * @ecryptfs_dentry: Fully initialized eCryptfs dentry object, with | |
100 | * the lower dentry and the lower mount set | |
101 | * | |
102 | * eCryptfs only ever keeps a single open file for every lower | |
103 | * inode. All I/O operations to the lower inode occur through that | |
104 | * file. When the first eCryptfs dentry that interposes with the first | |
105 | * lower dentry for that inode is created, this function creates the | |
106 | * persistent file struct and associates it with the eCryptfs | |
107 | * inode. When the eCryptfs inode is destroyed, the file is closed. | |
108 | * | |
109 | * The persistent file will be opened with read/write permissions, if | |
110 | * possible. Otherwise, it is opened read-only. | |
111 | * | |
112 | * This function does nothing if a lower persistent file is already | |
113 | * associated with the eCryptfs inode. | |
114 | * | |
115 | * Returns zero on success; non-zero otherwise | |
116 | */ | |
72b55fff | 117 | int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry) |
4981e081 | 118 | { |
745ca247 | 119 | const struct cred *cred = current_cred(); |
4981e081 MH |
120 | struct ecryptfs_inode_info *inode_info = |
121 | ecryptfs_inode_to_private(ecryptfs_dentry->d_inode); | |
122 | int rc = 0; | |
123 | ||
124 | mutex_lock(&inode_info->lower_file_mutex); | |
125 | if (!inode_info->lower_file) { | |
126 | struct dentry *lower_dentry; | |
127 | struct vfsmount *lower_mnt = | |
128 | ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry); | |
129 | ||
130 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
746f1e55 | 131 | rc = ecryptfs_privileged_open(&inode_info->lower_file, |
745ca247 | 132 | lower_dentry, lower_mnt, cred); |
ac22ba23 | 133 | if (rc) { |
4981e081 | 134 | printk(KERN_ERR "Error opening lower persistent file " |
746f1e55 MH |
135 | "for lower_dentry [0x%p] and lower_mnt [0x%p]; " |
136 | "rc = [%d]\n", lower_dentry, lower_mnt, rc); | |
4981e081 | 137 | inode_info->lower_file = NULL; |
b65a9cfc | 138 | } |
4981e081 MH |
139 | } |
140 | mutex_unlock(&inode_info->lower_file_mutex); | |
141 | return rc; | |
142 | } | |
143 | ||
237fead6 MH |
144 | /** |
145 | * ecryptfs_interpose | |
146 | * @lower_dentry: Existing dentry in the lower filesystem | |
147 | * @dentry: ecryptfs' dentry | |
148 | * @sb: ecryptfs's super_block | |
72b55fff | 149 | * @flags: flags to govern behavior of interpose procedure |
237fead6 MH |
150 | * |
151 | * Interposes upper and lower dentries. | |
152 | * | |
153 | * Returns zero on success; non-zero otherwise | |
154 | */ | |
155 | int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry, | |
72b55fff | 156 | struct super_block *sb, u32 flags) |
237fead6 MH |
157 | { |
158 | struct inode *lower_inode; | |
159 | struct inode *inode; | |
160 | int rc = 0; | |
161 | ||
162 | lower_inode = lower_dentry->d_inode; | |
163 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) { | |
164 | rc = -EXDEV; | |
165 | goto out; | |
166 | } | |
167 | if (!igrab(lower_inode)) { | |
168 | rc = -ESTALE; | |
169 | goto out; | |
170 | } | |
171 | inode = iget5_locked(sb, (unsigned long)lower_inode, | |
172 | ecryptfs_inode_test, ecryptfs_inode_set, | |
173 | lower_inode); | |
174 | if (!inode) { | |
175 | rc = -EACCES; | |
176 | iput(lower_inode); | |
177 | goto out; | |
178 | } | |
179 | if (inode->i_state & I_NEW) | |
180 | unlock_new_inode(inode); | |
181 | else | |
182 | iput(lower_inode); | |
183 | if (S_ISLNK(lower_inode->i_mode)) | |
184 | inode->i_op = &ecryptfs_symlink_iops; | |
185 | else if (S_ISDIR(lower_inode->i_mode)) | |
186 | inode->i_op = &ecryptfs_dir_iops; | |
187 | if (S_ISDIR(lower_inode->i_mode)) | |
188 | inode->i_fop = &ecryptfs_dir_fops; | |
26da8205 | 189 | if (special_file(lower_inode->i_mode)) |
237fead6 MH |
190 | init_special_inode(inode, lower_inode->i_mode, |
191 | lower_inode->i_rdev); | |
192 | dentry->d_op = &ecryptfs_dops; | |
9afa2fb6 | 193 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
194 | /* This size will be overwritten for real files w/ headers and |
195 | * other metadata */ | |
0cc72dc7 | 196 | fsstack_copy_inode_size(inode, lower_inode); |
ae6e8459 TH |
197 | if (flags & ECRYPTFS_INTERPOSE_FLAG_D_ADD) |
198 | d_add(dentry, inode); | |
199 | else | |
200 | d_instantiate(dentry, inode); | |
237fead6 MH |
201 | out: |
202 | return rc; | |
203 | } | |
204 | ||
2830bfd6 ES |
205 | enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig, |
206 | ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher, | |
207 | ecryptfs_opt_ecryptfs_key_bytes, | |
17398957 | 208 | ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata, |
87c94c4d MH |
209 | ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig, |
210 | ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes, | |
e77cc8d2 | 211 | ecryptfs_opt_unlink_sigs, ecryptfs_opt_err }; |
237fead6 | 212 | |
a447c093 | 213 | static const match_table_t tokens = { |
237fead6 MH |
214 | {ecryptfs_opt_sig, "sig=%s"}, |
215 | {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"}, | |
237fead6 MH |
216 | {ecryptfs_opt_cipher, "cipher=%s"}, |
217 | {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"}, | |
218 | {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"}, | |
219 | {ecryptfs_opt_passthrough, "ecryptfs_passthrough"}, | |
17398957 MH |
220 | {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"}, |
221 | {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"}, | |
87c94c4d MH |
222 | {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"}, |
223 | {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"}, | |
224 | {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"}, | |
e77cc8d2 | 225 | {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"}, |
237fead6 MH |
226 | {ecryptfs_opt_err, NULL} |
227 | }; | |
228 | ||
f4aad16a MH |
229 | static int ecryptfs_init_global_auth_toks( |
230 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat) | |
237fead6 | 231 | { |
f4aad16a | 232 | struct ecryptfs_global_auth_tok *global_auth_tok; |
237fead6 | 233 | int rc = 0; |
237fead6 | 234 | |
f4aad16a MH |
235 | list_for_each_entry(global_auth_tok, |
236 | &mount_crypt_stat->global_auth_tok_list, | |
237 | mount_crypt_stat_list) { | |
5dda6992 MH |
238 | rc = ecryptfs_keyring_auth_tok_for_sig( |
239 | &global_auth_tok->global_auth_tok_key, | |
240 | &global_auth_tok->global_auth_tok, | |
241 | global_auth_tok->sig); | |
242 | if (rc) { | |
f4aad16a MH |
243 | printk(KERN_ERR "Could not find valid key in user " |
244 | "session keyring for sig specified in mount " | |
245 | "option: [%s]\n", global_auth_tok->sig); | |
246 | global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID; | |
982363c9 | 247 | goto out; |
f4aad16a MH |
248 | } else |
249 | global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID; | |
237fead6 | 250 | } |
982363c9 | 251 | out: |
237fead6 MH |
252 | return rc; |
253 | } | |
254 | ||
f4aad16a MH |
255 | static void ecryptfs_init_mount_crypt_stat( |
256 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat) | |
257 | { | |
258 | memset((void *)mount_crypt_stat, 0, | |
259 | sizeof(struct ecryptfs_mount_crypt_stat)); | |
260 | INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list); | |
261 | mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex); | |
262 | mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED; | |
263 | } | |
264 | ||
237fead6 MH |
265 | /** |
266 | * ecryptfs_parse_options | |
267 | * @sb: The ecryptfs super block | |
268 | * @options: The options pased to the kernel | |
269 | * | |
270 | * Parse mount options: | |
271 | * debug=N - ecryptfs_verbosity level for debug output | |
272 | * sig=XXX - description(signature) of the key to use | |
273 | * | |
274 | * Returns the dentry object of the lower-level (lower/interposed) | |
275 | * directory; We want to mount our stackable file system on top of | |
276 | * that lower directory. | |
277 | * | |
278 | * The signature of the key to use must be the description of a key | |
279 | * already in the keyring. Mounting will fail if the key can not be | |
280 | * found. | |
281 | * | |
282 | * Returns zero on success; non-zero on error | |
283 | */ | |
2ccde7c6 | 284 | static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options) |
237fead6 MH |
285 | { |
286 | char *p; | |
287 | int rc = 0; | |
288 | int sig_set = 0; | |
289 | int cipher_name_set = 0; | |
87c94c4d | 290 | int fn_cipher_name_set = 0; |
237fead6 MH |
291 | int cipher_key_bytes; |
292 | int cipher_key_bytes_set = 0; | |
87c94c4d MH |
293 | int fn_cipher_key_bytes; |
294 | int fn_cipher_key_bytes_set = 0; | |
237fead6 | 295 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = |
2ccde7c6 | 296 | &sbi->mount_crypt_stat; |
237fead6 MH |
297 | substring_t args[MAX_OPT_ARGS]; |
298 | int token; | |
299 | char *sig_src; | |
237fead6 MH |
300 | char *cipher_name_dst; |
301 | char *cipher_name_src; | |
87c94c4d MH |
302 | char *fn_cipher_name_dst; |
303 | char *fn_cipher_name_src; | |
304 | char *fnek_dst; | |
305 | char *fnek_src; | |
237fead6 | 306 | char *cipher_key_bytes_src; |
87c94c4d | 307 | char *fn_cipher_key_bytes_src; |
237fead6 MH |
308 | |
309 | if (!options) { | |
310 | rc = -EINVAL; | |
311 | goto out; | |
312 | } | |
956159c3 | 313 | ecryptfs_init_mount_crypt_stat(mount_crypt_stat); |
237fead6 MH |
314 | while ((p = strsep(&options, ",")) != NULL) { |
315 | if (!*p) | |
316 | continue; | |
317 | token = match_token(p, tokens, args); | |
318 | switch (token) { | |
319 | case ecryptfs_opt_sig: | |
320 | case ecryptfs_opt_ecryptfs_sig: | |
321 | sig_src = args[0].from; | |
f4aad16a | 322 | rc = ecryptfs_add_global_auth_tok(mount_crypt_stat, |
84814d64 | 323 | sig_src, 0); |
f4aad16a MH |
324 | if (rc) { |
325 | printk(KERN_ERR "Error attempting to register " | |
326 | "global sig; rc = [%d]\n", rc); | |
327 | goto out; | |
328 | } | |
237fead6 MH |
329 | sig_set = 1; |
330 | break; | |
237fead6 MH |
331 | case ecryptfs_opt_cipher: |
332 | case ecryptfs_opt_ecryptfs_cipher: | |
333 | cipher_name_src = args[0].from; | |
334 | cipher_name_dst = | |
335 | mount_crypt_stat-> | |
336 | global_default_cipher_name; | |
337 | strncpy(cipher_name_dst, cipher_name_src, | |
338 | ECRYPTFS_MAX_CIPHER_NAME_SIZE); | |
87c94c4d | 339 | cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0'; |
237fead6 MH |
340 | cipher_name_set = 1; |
341 | break; | |
342 | case ecryptfs_opt_ecryptfs_key_bytes: | |
343 | cipher_key_bytes_src = args[0].from; | |
344 | cipher_key_bytes = | |
345 | (int)simple_strtol(cipher_key_bytes_src, | |
346 | &cipher_key_bytes_src, 0); | |
347 | mount_crypt_stat->global_default_cipher_key_size = | |
348 | cipher_key_bytes; | |
237fead6 MH |
349 | cipher_key_bytes_set = 1; |
350 | break; | |
351 | case ecryptfs_opt_passthrough: | |
352 | mount_crypt_stat->flags |= | |
353 | ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED; | |
354 | break; | |
17398957 MH |
355 | case ecryptfs_opt_xattr_metadata: |
356 | mount_crypt_stat->flags |= | |
357 | ECRYPTFS_XATTR_METADATA_ENABLED; | |
358 | break; | |
359 | case ecryptfs_opt_encrypted_view: | |
360 | mount_crypt_stat->flags |= | |
361 | ECRYPTFS_XATTR_METADATA_ENABLED; | |
362 | mount_crypt_stat->flags |= | |
363 | ECRYPTFS_ENCRYPTED_VIEW_ENABLED; | |
364 | break; | |
87c94c4d MH |
365 | case ecryptfs_opt_fnek_sig: |
366 | fnek_src = args[0].from; | |
367 | fnek_dst = | |
368 | mount_crypt_stat->global_default_fnek_sig; | |
369 | strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX); | |
370 | mount_crypt_stat->global_default_fnek_sig[ | |
371 | ECRYPTFS_SIG_SIZE_HEX] = '\0'; | |
372 | rc = ecryptfs_add_global_auth_tok( | |
373 | mount_crypt_stat, | |
84814d64 TH |
374 | mount_crypt_stat->global_default_fnek_sig, |
375 | ECRYPTFS_AUTH_TOK_FNEK); | |
87c94c4d MH |
376 | if (rc) { |
377 | printk(KERN_ERR "Error attempting to register " | |
378 | "global fnek sig [%s]; rc = [%d]\n", | |
379 | mount_crypt_stat->global_default_fnek_sig, | |
380 | rc); | |
381 | goto out; | |
382 | } | |
383 | mount_crypt_stat->flags |= | |
384 | (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES | |
385 | | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK); | |
386 | break; | |
387 | case ecryptfs_opt_fn_cipher: | |
388 | fn_cipher_name_src = args[0].from; | |
389 | fn_cipher_name_dst = | |
390 | mount_crypt_stat->global_default_fn_cipher_name; | |
391 | strncpy(fn_cipher_name_dst, fn_cipher_name_src, | |
392 | ECRYPTFS_MAX_CIPHER_NAME_SIZE); | |
393 | mount_crypt_stat->global_default_fn_cipher_name[ | |
394 | ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0'; | |
395 | fn_cipher_name_set = 1; | |
396 | break; | |
397 | case ecryptfs_opt_fn_cipher_key_bytes: | |
398 | fn_cipher_key_bytes_src = args[0].from; | |
399 | fn_cipher_key_bytes = | |
400 | (int)simple_strtol(fn_cipher_key_bytes_src, | |
401 | &fn_cipher_key_bytes_src, 0); | |
402 | mount_crypt_stat->global_default_fn_cipher_key_bytes = | |
403 | fn_cipher_key_bytes; | |
404 | fn_cipher_key_bytes_set = 1; | |
405 | break; | |
e77cc8d2 TH |
406 | case ecryptfs_opt_unlink_sigs: |
407 | mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS; | |
408 | break; | |
237fead6 MH |
409 | case ecryptfs_opt_err: |
410 | default: | |
87c94c4d MH |
411 | printk(KERN_WARNING |
412 | "%s: eCryptfs: unrecognized option [%s]\n", | |
413 | __func__, p); | |
237fead6 MH |
414 | } |
415 | } | |
237fead6 MH |
416 | if (!sig_set) { |
417 | rc = -EINVAL; | |
956159c3 MH |
418 | ecryptfs_printk(KERN_ERR, "You must supply at least one valid " |
419 | "auth tok signature as a mount " | |
237fead6 MH |
420 | "parameter; see the eCryptfs README\n"); |
421 | goto out; | |
422 | } | |
423 | if (!cipher_name_set) { | |
8f236809 MS |
424 | int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER); |
425 | ||
426 | BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE); | |
8f236809 MS |
427 | strcpy(mount_crypt_stat->global_default_cipher_name, |
428 | ECRYPTFS_DEFAULT_CIPHER); | |
237fead6 | 429 | } |
87c94c4d MH |
430 | if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
431 | && !fn_cipher_name_set) | |
432 | strcpy(mount_crypt_stat->global_default_fn_cipher_name, | |
433 | mount_crypt_stat->global_default_cipher_name); | |
434 | if (!cipher_key_bytes_set) | |
e5d9cbde | 435 | mount_crypt_stat->global_default_cipher_key_size = 0; |
87c94c4d MH |
436 | if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
437 | && !fn_cipher_key_bytes_set) | |
438 | mount_crypt_stat->global_default_fn_cipher_key_bytes = | |
439 | mount_crypt_stat->global_default_cipher_key_size; | |
af440f52 ES |
440 | mutex_lock(&key_tfm_list_mutex); |
441 | if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name, | |
87c94c4d | 442 | NULL)) { |
af440f52 ES |
443 | rc = ecryptfs_add_new_key_tfm( |
444 | NULL, mount_crypt_stat->global_default_cipher_name, | |
445 | mount_crypt_stat->global_default_cipher_key_size); | |
87c94c4d MH |
446 | if (rc) { |
447 | printk(KERN_ERR "Error attempting to initialize " | |
448 | "cipher with name = [%s] and key size = [%td]; " | |
449 | "rc = [%d]\n", | |
450 | mount_crypt_stat->global_default_cipher_name, | |
451 | mount_crypt_stat->global_default_cipher_key_size, | |
452 | rc); | |
453 | rc = -EINVAL; | |
454 | mutex_unlock(&key_tfm_list_mutex); | |
455 | goto out; | |
456 | } | |
457 | } | |
458 | if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) | |
459 | && !ecryptfs_tfm_exists( | |
460 | mount_crypt_stat->global_default_fn_cipher_name, NULL)) { | |
461 | rc = ecryptfs_add_new_key_tfm( | |
462 | NULL, mount_crypt_stat->global_default_fn_cipher_name, | |
463 | mount_crypt_stat->global_default_fn_cipher_key_bytes); | |
464 | if (rc) { | |
465 | printk(KERN_ERR "Error attempting to initialize " | |
466 | "cipher with name = [%s] and key size = [%td]; " | |
467 | "rc = [%d]\n", | |
468 | mount_crypt_stat->global_default_fn_cipher_name, | |
469 | mount_crypt_stat->global_default_fn_cipher_key_bytes, | |
470 | rc); | |
471 | rc = -EINVAL; | |
472 | mutex_unlock(&key_tfm_list_mutex); | |
473 | goto out; | |
474 | } | |
237fead6 | 475 | } |
87c94c4d | 476 | mutex_unlock(&key_tfm_list_mutex); |
5dda6992 | 477 | rc = ecryptfs_init_global_auth_toks(mount_crypt_stat); |
87c94c4d | 478 | if (rc) |
f4aad16a MH |
479 | printk(KERN_WARNING "One or more global auth toks could not " |
480 | "properly register; rc = [%d]\n", rc); | |
237fead6 MH |
481 | out: |
482 | return rc; | |
483 | } | |
484 | ||
485 | struct kmem_cache *ecryptfs_sb_info_cache; | |
4403158b | 486 | static struct file_system_type ecryptfs_fs_type; |
237fead6 | 487 | |
237fead6 MH |
488 | /** |
489 | * ecryptfs_read_super | |
490 | * @sb: The ecryptfs super block | |
491 | * @dev_name: The path to mount over | |
492 | * | |
493 | * Read the super block of the lower filesystem, and use | |
494 | * ecryptfs_interpose to create our initial inode and super block | |
495 | * struct. | |
496 | */ | |
497 | static int ecryptfs_read_super(struct super_block *sb, const char *dev_name) | |
498 | { | |
421748ec | 499 | struct path path; |
237fead6 | 500 | int rc; |
237fead6 | 501 | |
421748ec | 502 | rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); |
237fead6 MH |
503 | if (rc) { |
504 | ecryptfs_printk(KERN_WARNING, "path_lookup() failed\n"); | |
65dc8145 | 505 | goto out; |
237fead6 | 506 | } |
4403158b AV |
507 | if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) { |
508 | rc = -EINVAL; | |
509 | printk(KERN_ERR "Mount on filesystem of type " | |
510 | "eCryptfs explicitly disallowed due to " | |
511 | "known incompatibilities\n"); | |
512 | goto out_free; | |
513 | } | |
421748ec AV |
514 | ecryptfs_set_superblock_lower(sb, path.dentry->d_sb); |
515 | sb->s_maxbytes = path.dentry->d_sb->s_maxbytes; | |
516 | sb->s_blocksize = path.dentry->d_sb->s_blocksize; | |
517 | ecryptfs_set_dentry_lower(sb->s_root, path.dentry); | |
518 | ecryptfs_set_dentry_lower_mnt(sb->s_root, path.mnt); | |
519 | rc = ecryptfs_interpose(path.dentry, sb->s_root, sb, 0); | |
5dda6992 | 520 | if (rc) |
237fead6 MH |
521 | goto out_free; |
522 | rc = 0; | |
523 | goto out; | |
524 | out_free: | |
421748ec | 525 | path_put(&path); |
237fead6 MH |
526 | out: |
527 | return rc; | |
528 | } | |
529 | ||
530 | /** | |
531 | * ecryptfs_get_sb | |
532 | * @fs_type | |
533 | * @flags | |
534 | * @dev_name: The path to mount over | |
535 | * @raw_data: The options passed into the kernel | |
536 | * | |
2ccde7c6 | 537 | * The whole ecryptfs_get_sb process is broken into 3 functions: |
237fead6 | 538 | * ecryptfs_parse_options(): handle options passed to ecryptfs, if any |
237fead6 | 539 | * ecryptfs_read_super(): this accesses the lower filesystem and uses |
fe0fc013 EZ |
540 | * ecryptfs_interpose to perform most of the linking |
541 | * ecryptfs_interpose(): links the lower filesystem into ecryptfs (inode.c) | |
237fead6 MH |
542 | */ |
543 | static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags, | |
544 | const char *dev_name, void *raw_data, | |
545 | struct vfsmount *mnt) | |
546 | { | |
2ccde7c6 AV |
547 | struct super_block *s; |
548 | struct ecryptfs_sb_info *sbi; | |
549 | struct ecryptfs_dentry_info *root_info; | |
550 | const char *err = "Getting sb failed"; | |
237fead6 | 551 | int rc; |
237fead6 | 552 | |
2ccde7c6 AV |
553 | sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL); |
554 | if (!sbi) { | |
555 | rc = -ENOMEM; | |
237fead6 MH |
556 | goto out; |
557 | } | |
2ccde7c6 AV |
558 | |
559 | rc = ecryptfs_parse_options(sbi, raw_data); | |
237fead6 | 560 | if (rc) { |
2ccde7c6 AV |
561 | err = "Error parsing options"; |
562 | goto out; | |
237fead6 | 563 | } |
2ccde7c6 AV |
564 | |
565 | s = sget(fs_type, NULL, set_anon_super, NULL); | |
566 | if (IS_ERR(s)) { | |
567 | rc = PTR_ERR(s); | |
568 | goto out; | |
569 | } | |
570 | ||
571 | s->s_flags = flags; | |
572 | rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY); | |
237fead6 | 573 | if (rc) { |
2ccde7c6 AV |
574 | deactivate_locked_super(s); |
575 | goto out; | |
237fead6 | 576 | } |
2ccde7c6 AV |
577 | |
578 | ecryptfs_set_superblock_private(s, sbi); | |
579 | s->s_bdi = &sbi->bdi; | |
580 | ||
581 | /* ->kill_sb() will take care of sbi after that point */ | |
582 | sbi = NULL; | |
583 | s->s_op = &ecryptfs_sops; | |
584 | ||
585 | rc = -ENOMEM; | |
586 | s->s_root = d_alloc(NULL, &(const struct qstr) { | |
587 | .hash = 0,.name = "/",.len = 1}); | |
588 | if (!s->s_root) { | |
589 | deactivate_locked_super(s); | |
590 | goto out; | |
591 | } | |
592 | s->s_root->d_op = &ecryptfs_dops; | |
593 | s->s_root->d_sb = s; | |
594 | s->s_root->d_parent = s->s_root; | |
595 | ||
596 | root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL); | |
597 | if (!root_info) { | |
598 | deactivate_locked_super(s); | |
599 | goto out; | |
600 | } | |
601 | /* ->kill_sb() will take care of root_info */ | |
602 | ecryptfs_set_dentry_private(s->s_root, root_info); | |
603 | s->s_flags |= MS_ACTIVE; | |
604 | rc = ecryptfs_read_super(s, dev_name); | |
605 | if (rc) { | |
606 | deactivate_locked_super(s); | |
607 | err = "Reading sb failed"; | |
608 | goto out; | |
609 | } | |
610 | simple_set_mnt(mnt, s); | |
611 | return 0; | |
612 | ||
237fead6 | 613 | out: |
2ccde7c6 AV |
614 | if (sbi) { |
615 | ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat); | |
616 | kmem_cache_free(ecryptfs_sb_info_cache, sbi); | |
617 | } | |
618 | printk(KERN_ERR "%s; rc = [%d]\n", err, rc); | |
237fead6 MH |
619 | return rc; |
620 | } | |
621 | ||
622 | /** | |
623 | * ecryptfs_kill_block_super | |
624 | * @sb: The ecryptfs super block | |
625 | * | |
626 | * Used to bring the superblock down and free the private data. | |
237fead6 MH |
627 | */ |
628 | static void ecryptfs_kill_block_super(struct super_block *sb) | |
629 | { | |
decabd66 AV |
630 | struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb); |
631 | kill_anon_super(sb); | |
632 | if (!sb_info) | |
633 | return; | |
634 | ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat); | |
635 | bdi_destroy(&sb_info->bdi); | |
636 | kmem_cache_free(ecryptfs_sb_info_cache, sb_info); | |
237fead6 MH |
637 | } |
638 | ||
639 | static struct file_system_type ecryptfs_fs_type = { | |
640 | .owner = THIS_MODULE, | |
641 | .name = "ecryptfs", | |
642 | .get_sb = ecryptfs_get_sb, | |
643 | .kill_sb = ecryptfs_kill_block_super, | |
644 | .fs_flags = 0 | |
645 | }; | |
646 | ||
647 | /** | |
648 | * inode_info_init_once | |
649 | * | |
650 | * Initializes the ecryptfs_inode_info_cache when it is created | |
651 | */ | |
652 | static void | |
51cc5068 | 653 | inode_info_init_once(void *vptr) |
237fead6 MH |
654 | { |
655 | struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr; | |
656 | ||
a35afb83 | 657 | inode_init_once(&ei->vfs_inode); |
237fead6 MH |
658 | } |
659 | ||
660 | static struct ecryptfs_cache_info { | |
e18b890b | 661 | struct kmem_cache **cache; |
237fead6 MH |
662 | const char *name; |
663 | size_t size; | |
51cc5068 | 664 | void (*ctor)(void *obj); |
237fead6 MH |
665 | } ecryptfs_cache_infos[] = { |
666 | { | |
667 | .cache = &ecryptfs_auth_tok_list_item_cache, | |
668 | .name = "ecryptfs_auth_tok_list_item", | |
669 | .size = sizeof(struct ecryptfs_auth_tok_list_item), | |
670 | }, | |
671 | { | |
672 | .cache = &ecryptfs_file_info_cache, | |
673 | .name = "ecryptfs_file_cache", | |
674 | .size = sizeof(struct ecryptfs_file_info), | |
675 | }, | |
676 | { | |
677 | .cache = &ecryptfs_dentry_info_cache, | |
678 | .name = "ecryptfs_dentry_info_cache", | |
679 | .size = sizeof(struct ecryptfs_dentry_info), | |
680 | }, | |
681 | { | |
682 | .cache = &ecryptfs_inode_info_cache, | |
683 | .name = "ecryptfs_inode_cache", | |
684 | .size = sizeof(struct ecryptfs_inode_info), | |
685 | .ctor = inode_info_init_once, | |
686 | }, | |
687 | { | |
688 | .cache = &ecryptfs_sb_info_cache, | |
689 | .name = "ecryptfs_sb_cache", | |
690 | .size = sizeof(struct ecryptfs_sb_info), | |
691 | }, | |
237fead6 MH |
692 | { |
693 | .cache = &ecryptfs_header_cache_1, | |
694 | .name = "ecryptfs_headers_1", | |
695 | .size = PAGE_CACHE_SIZE, | |
696 | }, | |
697 | { | |
698 | .cache = &ecryptfs_header_cache_2, | |
699 | .name = "ecryptfs_headers_2", | |
700 | .size = PAGE_CACHE_SIZE, | |
701 | }, | |
dd2a3b7a MH |
702 | { |
703 | .cache = &ecryptfs_xattr_cache, | |
704 | .name = "ecryptfs_xattr_cache", | |
705 | .size = PAGE_CACHE_SIZE, | |
706 | }, | |
eb95e7ff MH |
707 | { |
708 | .cache = &ecryptfs_key_record_cache, | |
709 | .name = "ecryptfs_key_record_cache", | |
710 | .size = sizeof(struct ecryptfs_key_record), | |
711 | }, | |
956159c3 MH |
712 | { |
713 | .cache = &ecryptfs_key_sig_cache, | |
714 | .name = "ecryptfs_key_sig_cache", | |
715 | .size = sizeof(struct ecryptfs_key_sig), | |
716 | }, | |
717 | { | |
718 | .cache = &ecryptfs_global_auth_tok_cache, | |
719 | .name = "ecryptfs_global_auth_tok_cache", | |
720 | .size = sizeof(struct ecryptfs_global_auth_tok), | |
721 | }, | |
722 | { | |
723 | .cache = &ecryptfs_key_tfm_cache, | |
724 | .name = "ecryptfs_key_tfm_cache", | |
725 | .size = sizeof(struct ecryptfs_key_tfm), | |
726 | }, | |
746f1e55 MH |
727 | { |
728 | .cache = &ecryptfs_open_req_cache, | |
729 | .name = "ecryptfs_open_req_cache", | |
730 | .size = sizeof(struct ecryptfs_open_req), | |
731 | }, | |
237fead6 MH |
732 | }; |
733 | ||
734 | static void ecryptfs_free_kmem_caches(void) | |
735 | { | |
736 | int i; | |
737 | ||
738 | for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { | |
739 | struct ecryptfs_cache_info *info; | |
740 | ||
741 | info = &ecryptfs_cache_infos[i]; | |
742 | if (*(info->cache)) | |
743 | kmem_cache_destroy(*(info->cache)); | |
744 | } | |
745 | } | |
746 | ||
747 | /** | |
748 | * ecryptfs_init_kmem_caches | |
749 | * | |
750 | * Returns zero on success; non-zero otherwise | |
751 | */ | |
752 | static int ecryptfs_init_kmem_caches(void) | |
753 | { | |
754 | int i; | |
755 | ||
756 | for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { | |
757 | struct ecryptfs_cache_info *info; | |
758 | ||
759 | info = &ecryptfs_cache_infos[i]; | |
760 | *(info->cache) = kmem_cache_create(info->name, info->size, | |
20c2df83 | 761 | 0, SLAB_HWCACHE_ALIGN, info->ctor); |
237fead6 MH |
762 | if (!*(info->cache)) { |
763 | ecryptfs_free_kmem_caches(); | |
764 | ecryptfs_printk(KERN_WARNING, "%s: " | |
765 | "kmem_cache_create failed\n", | |
766 | info->name); | |
767 | return -ENOMEM; | |
768 | } | |
769 | } | |
770 | return 0; | |
771 | } | |
772 | ||
6e90aa97 | 773 | static struct kobject *ecryptfs_kobj; |
237fead6 | 774 | |
386f275f KS |
775 | static ssize_t version_show(struct kobject *kobj, |
776 | struct kobj_attribute *attr, char *buff) | |
237fead6 MH |
777 | { |
778 | return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK); | |
779 | } | |
780 | ||
386f275f | 781 | static struct kobj_attribute version_attr = __ATTR_RO(version); |
237fead6 | 782 | |
30a468b1 GKH |
783 | static struct attribute *attributes[] = { |
784 | &version_attr.attr, | |
30a468b1 GKH |
785 | NULL, |
786 | }; | |
787 | ||
788 | static struct attribute_group attr_group = { | |
789 | .attrs = attributes, | |
790 | }; | |
237fead6 MH |
791 | |
792 | static int do_sysfs_registration(void) | |
793 | { | |
794 | int rc; | |
795 | ||
6e90aa97 GKH |
796 | ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj); |
797 | if (!ecryptfs_kobj) { | |
917e865d GKH |
798 | printk(KERN_ERR "Unable to create ecryptfs kset\n"); |
799 | rc = -ENOMEM; | |
237fead6 MH |
800 | goto out; |
801 | } | |
6e90aa97 | 802 | rc = sysfs_create_group(ecryptfs_kobj, &attr_group); |
237fead6 MH |
803 | if (rc) { |
804 | printk(KERN_ERR | |
30a468b1 | 805 | "Unable to create ecryptfs version attributes\n"); |
197b12d6 | 806 | kobject_put(ecryptfs_kobj); |
237fead6 MH |
807 | } |
808 | out: | |
809 | return rc; | |
810 | } | |
811 | ||
a75de1b3 RK |
812 | static void do_sysfs_unregistration(void) |
813 | { | |
6e90aa97 | 814 | sysfs_remove_group(ecryptfs_kobj, &attr_group); |
197b12d6 | 815 | kobject_put(ecryptfs_kobj); |
a75de1b3 RK |
816 | } |
817 | ||
237fead6 MH |
818 | static int __init ecryptfs_init(void) |
819 | { | |
820 | int rc; | |
821 | ||
822 | if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) { | |
823 | rc = -EINVAL; | |
824 | ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is " | |
825 | "larger than the host's page size, and so " | |
826 | "eCryptfs cannot run on this system. The " | |
827 | "default eCryptfs extent size is [%d] bytes; " | |
828 | "the page size is [%d] bytes.\n", | |
829 | ECRYPTFS_DEFAULT_EXTENT_SIZE, PAGE_CACHE_SIZE); | |
830 | goto out; | |
831 | } | |
832 | rc = ecryptfs_init_kmem_caches(); | |
833 | if (rc) { | |
834 | printk(KERN_ERR | |
835 | "Failed to allocate one or more kmem_cache objects\n"); | |
836 | goto out; | |
837 | } | |
838 | rc = register_filesystem(&ecryptfs_fs_type); | |
839 | if (rc) { | |
840 | printk(KERN_ERR "Failed to register filesystem\n"); | |
cf81f89d | 841 | goto out_free_kmem_caches; |
237fead6 | 842 | } |
237fead6 MH |
843 | rc = do_sysfs_registration(); |
844 | if (rc) { | |
845 | printk(KERN_ERR "sysfs registration failed\n"); | |
cf81f89d | 846 | goto out_unregister_filesystem; |
237fead6 | 847 | } |
746f1e55 MH |
848 | rc = ecryptfs_init_kthread(); |
849 | if (rc) { | |
850 | printk(KERN_ERR "%s: kthread initialization failed; " | |
851 | "rc = [%d]\n", __func__, rc); | |
852 | goto out_do_sysfs_unregistration; | |
853 | } | |
624ae528 | 854 | rc = ecryptfs_init_messaging(); |
dddfa461 | 855 | if (rc) { |
746f1e55 | 856 | printk(KERN_ERR "Failure occured while attempting to " |
624ae528 TH |
857 | "initialize the communications channel to " |
858 | "ecryptfsd\n"); | |
746f1e55 | 859 | goto out_destroy_kthread; |
956159c3 MH |
860 | } |
861 | rc = ecryptfs_init_crypto(); | |
862 | if (rc) { | |
863 | printk(KERN_ERR "Failure whilst attempting to init crypto; " | |
864 | "rc = [%d]\n", rc); | |
cf81f89d | 865 | goto out_release_messaging; |
dddfa461 | 866 | } |
2830bfd6 ES |
867 | if (ecryptfs_verbosity > 0) |
868 | printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values " | |
869 | "will be written to the syslog!\n", ecryptfs_verbosity); | |
870 | ||
cf81f89d MH |
871 | goto out; |
872 | out_release_messaging: | |
624ae528 | 873 | ecryptfs_release_messaging(); |
746f1e55 MH |
874 | out_destroy_kthread: |
875 | ecryptfs_destroy_kthread(); | |
cf81f89d MH |
876 | out_do_sysfs_unregistration: |
877 | do_sysfs_unregistration(); | |
878 | out_unregister_filesystem: | |
879 | unregister_filesystem(&ecryptfs_fs_type); | |
880 | out_free_kmem_caches: | |
881 | ecryptfs_free_kmem_caches(); | |
237fead6 MH |
882 | out: |
883 | return rc; | |
884 | } | |
885 | ||
886 | static void __exit ecryptfs_exit(void) | |
887 | { | |
cf81f89d MH |
888 | int rc; |
889 | ||
890 | rc = ecryptfs_destroy_crypto(); | |
891 | if (rc) | |
892 | printk(KERN_ERR "Failure whilst attempting to destroy crypto; " | |
893 | "rc = [%d]\n", rc); | |
624ae528 | 894 | ecryptfs_release_messaging(); |
746f1e55 | 895 | ecryptfs_destroy_kthread(); |
cf81f89d | 896 | do_sysfs_unregistration(); |
237fead6 MH |
897 | unregister_filesystem(&ecryptfs_fs_type); |
898 | ecryptfs_free_kmem_caches(); | |
899 | } | |
900 | ||
901 | MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>"); | |
902 | MODULE_DESCRIPTION("eCryptfs"); | |
903 | ||
904 | MODULE_LICENSE("GPL"); | |
905 | ||
906 | module_init(ecryptfs_init) | |
907 | module_exit(ecryptfs_exit) |