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Commit | Line | Data |
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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> |
070baa51 | 39 | #include <linux/magic.h> |
237fead6 MH |
40 | #include "ecryptfs_kernel.h" |
41 | ||
42 | /** | |
43 | * Module parameter that defines the ecryptfs_verbosity level. | |
44 | */ | |
45 | int ecryptfs_verbosity = 0; | |
46 | ||
47 | module_param(ecryptfs_verbosity, int, 0); | |
48 | MODULE_PARM_DESC(ecryptfs_verbosity, | |
49 | "Initial verbosity level (0 or 1; defaults to " | |
50 | "0, which is Quiet)"); | |
51 | ||
dddfa461 | 52 | /** |
624ae528 | 53 | * Module parameter that defines the number of message buffer elements |
dddfa461 MH |
54 | */ |
55 | unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS; | |
56 | ||
57 | module_param(ecryptfs_message_buf_len, uint, 0); | |
58 | MODULE_PARM_DESC(ecryptfs_message_buf_len, | |
59 | "Number of message buffer elements"); | |
60 | ||
61 | /** | |
62 | * Module parameter that defines the maximum guaranteed amount of time to wait | |
624ae528 | 63 | * for a response from ecryptfsd. The actual sleep time will be, more than |
dddfa461 | 64 | * likely, a small amount greater than this specified value, but only less if |
624ae528 | 65 | * the message successfully arrives. |
dddfa461 MH |
66 | */ |
67 | signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ; | |
68 | ||
69 | module_param(ecryptfs_message_wait_timeout, long, 0); | |
70 | MODULE_PARM_DESC(ecryptfs_message_wait_timeout, | |
71 | "Maximum number of seconds that an operation will " | |
72 | "sleep while waiting for a message response from " | |
73 | "userspace"); | |
74 | ||
75 | /** | |
76 | * Module parameter that is an estimate of the maximum number of users | |
77 | * that will be concurrently using eCryptfs. Set this to the right | |
78 | * value to balance performance and memory use. | |
79 | */ | |
80 | unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS; | |
81 | ||
82 | module_param(ecryptfs_number_of_users, uint, 0); | |
83 | MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of " | |
84 | "concurrent users of eCryptfs"); | |
85 | ||
237fead6 MH |
86 | void __ecryptfs_printk(const char *fmt, ...) |
87 | { | |
88 | va_list args; | |
89 | va_start(args, fmt); | |
90 | if (fmt[1] == '7') { /* KERN_DEBUG */ | |
91 | if (ecryptfs_verbosity >= 1) | |
92 | vprintk(fmt, args); | |
93 | } else | |
94 | vprintk(fmt, args); | |
95 | va_end(args); | |
96 | } | |
97 | ||
4981e081 MH |
98 | /** |
99 | * ecryptfs_init_persistent_file | |
100 | * @ecryptfs_dentry: Fully initialized eCryptfs dentry object, with | |
101 | * the lower dentry and the lower mount set | |
102 | * | |
103 | * eCryptfs only ever keeps a single open file for every lower | |
104 | * inode. All I/O operations to the lower inode occur through that | |
105 | * file. When the first eCryptfs dentry that interposes with the first | |
106 | * lower dentry for that inode is created, this function creates the | |
107 | * persistent file struct and associates it with the eCryptfs | |
108 | * inode. When the eCryptfs inode is destroyed, the file is closed. | |
109 | * | |
110 | * The persistent file will be opened with read/write permissions, if | |
111 | * possible. Otherwise, it is opened read-only. | |
112 | * | |
113 | * This function does nothing if a lower persistent file is already | |
114 | * associated with the eCryptfs inode. | |
115 | * | |
116 | * Returns zero on success; non-zero otherwise | |
117 | */ | |
72b55fff | 118 | int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry) |
4981e081 | 119 | { |
745ca247 | 120 | const struct cred *cred = current_cred(); |
4981e081 MH |
121 | struct ecryptfs_inode_info *inode_info = |
122 | ecryptfs_inode_to_private(ecryptfs_dentry->d_inode); | |
123 | int rc = 0; | |
124 | ||
4981e081 MH |
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 | 139 | } |
4981e081 MH |
140 | return rc; |
141 | } | |
142 | ||
6254b32b | 143 | static struct inode *ecryptfs_get_inode(struct inode *lower_inode, |
66cb7666 | 144 | struct super_block *sb) |
237fead6 | 145 | { |
237fead6 MH |
146 | struct inode *inode; |
147 | int rc = 0; | |
148 | ||
237fead6 MH |
149 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) { |
150 | rc = -EXDEV; | |
151 | goto out; | |
152 | } | |
153 | if (!igrab(lower_inode)) { | |
154 | rc = -ESTALE; | |
155 | goto out; | |
156 | } | |
157 | inode = iget5_locked(sb, (unsigned long)lower_inode, | |
158 | ecryptfs_inode_test, ecryptfs_inode_set, | |
159 | lower_inode); | |
160 | if (!inode) { | |
161 | rc = -EACCES; | |
162 | iput(lower_inode); | |
163 | goto out; | |
164 | } | |
165 | if (inode->i_state & I_NEW) | |
166 | unlock_new_inode(inode); | |
167 | else | |
168 | iput(lower_inode); | |
169 | if (S_ISLNK(lower_inode->i_mode)) | |
170 | inode->i_op = &ecryptfs_symlink_iops; | |
171 | else if (S_ISDIR(lower_inode->i_mode)) | |
172 | inode->i_op = &ecryptfs_dir_iops; | |
173 | if (S_ISDIR(lower_inode->i_mode)) | |
174 | inode->i_fop = &ecryptfs_dir_fops; | |
26da8205 | 175 | if (special_file(lower_inode->i_mode)) |
237fead6 MH |
176 | init_special_inode(inode, lower_inode->i_mode, |
177 | lower_inode->i_rdev); | |
9afa2fb6 | 178 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
179 | /* This size will be overwritten for real files w/ headers and |
180 | * other metadata */ | |
0cc72dc7 | 181 | fsstack_copy_inode_size(inode, lower_inode); |
66cb7666 AV |
182 | return inode; |
183 | out: | |
184 | return ERR_PTR(rc); | |
185 | } | |
186 | ||
187 | /** | |
188 | * ecryptfs_interpose | |
189 | * @lower_dentry: Existing dentry in the lower filesystem | |
190 | * @dentry: ecryptfs' dentry | |
191 | * @sb: ecryptfs's super_block | |
192 | * @flags: flags to govern behavior of interpose procedure | |
193 | * | |
194 | * Interposes upper and lower dentries. | |
195 | * | |
196 | * Returns zero on success; non-zero otherwise | |
197 | */ | |
198 | int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry, | |
199 | struct super_block *sb, u32 flags) | |
200 | { | |
201 | struct inode *lower_inode = lower_dentry->d_inode; | |
202 | struct inode *inode = ecryptfs_get_inode(lower_inode, sb); | |
6254b32b | 203 | if (IS_ERR(inode)) |
66cb7666 | 204 | return PTR_ERR(inode); |
ae6e8459 TH |
205 | if (flags & ECRYPTFS_INTERPOSE_FLAG_D_ADD) |
206 | d_add(dentry, inode); | |
207 | else | |
208 | d_instantiate(dentry, inode); | |
66cb7666 | 209 | return 0; |
237fead6 MH |
210 | } |
211 | ||
2830bfd6 ES |
212 | enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig, |
213 | ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher, | |
214 | ecryptfs_opt_ecryptfs_key_bytes, | |
17398957 | 215 | ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata, |
87c94c4d MH |
216 | ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig, |
217 | ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes, | |
f16feb51 RS |
218 | ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only, |
219 | ecryptfs_opt_err }; | |
237fead6 | 220 | |
a447c093 | 221 | static const match_table_t tokens = { |
237fead6 MH |
222 | {ecryptfs_opt_sig, "sig=%s"}, |
223 | {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"}, | |
237fead6 MH |
224 | {ecryptfs_opt_cipher, "cipher=%s"}, |
225 | {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"}, | |
226 | {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"}, | |
227 | {ecryptfs_opt_passthrough, "ecryptfs_passthrough"}, | |
17398957 MH |
228 | {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"}, |
229 | {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"}, | |
87c94c4d MH |
230 | {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"}, |
231 | {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"}, | |
232 | {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"}, | |
e77cc8d2 | 233 | {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"}, |
f16feb51 | 234 | {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"}, |
237fead6 MH |
235 | {ecryptfs_opt_err, NULL} |
236 | }; | |
237 | ||
f4aad16a MH |
238 | static int ecryptfs_init_global_auth_toks( |
239 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat) | |
237fead6 | 240 | { |
f4aad16a | 241 | struct ecryptfs_global_auth_tok *global_auth_tok; |
237fead6 | 242 | int rc = 0; |
237fead6 | 243 | |
f4aad16a MH |
244 | list_for_each_entry(global_auth_tok, |
245 | &mount_crypt_stat->global_auth_tok_list, | |
246 | mount_crypt_stat_list) { | |
5dda6992 MH |
247 | rc = ecryptfs_keyring_auth_tok_for_sig( |
248 | &global_auth_tok->global_auth_tok_key, | |
249 | &global_auth_tok->global_auth_tok, | |
250 | global_auth_tok->sig); | |
251 | if (rc) { | |
f4aad16a MH |
252 | printk(KERN_ERR "Could not find valid key in user " |
253 | "session keyring for sig specified in mount " | |
254 | "option: [%s]\n", global_auth_tok->sig); | |
255 | global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID; | |
982363c9 | 256 | goto out; |
f4aad16a MH |
257 | } else |
258 | global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID; | |
237fead6 | 259 | } |
982363c9 | 260 | out: |
237fead6 MH |
261 | return rc; |
262 | } | |
263 | ||
f4aad16a MH |
264 | static void ecryptfs_init_mount_crypt_stat( |
265 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat) | |
266 | { | |
267 | memset((void *)mount_crypt_stat, 0, | |
268 | sizeof(struct ecryptfs_mount_crypt_stat)); | |
269 | INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list); | |
270 | mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex); | |
271 | mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED; | |
272 | } | |
273 | ||
237fead6 MH |
274 | /** |
275 | * ecryptfs_parse_options | |
276 | * @sb: The ecryptfs super block | |
277 | * @options: The options pased to the kernel | |
278 | * | |
279 | * Parse mount options: | |
280 | * debug=N - ecryptfs_verbosity level for debug output | |
281 | * sig=XXX - description(signature) of the key to use | |
282 | * | |
283 | * Returns the dentry object of the lower-level (lower/interposed) | |
284 | * directory; We want to mount our stackable file system on top of | |
285 | * that lower directory. | |
286 | * | |
287 | * The signature of the key to use must be the description of a key | |
288 | * already in the keyring. Mounting will fail if the key can not be | |
289 | * found. | |
290 | * | |
291 | * Returns zero on success; non-zero on error | |
292 | */ | |
2ccde7c6 | 293 | static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options) |
237fead6 MH |
294 | { |
295 | char *p; | |
296 | int rc = 0; | |
297 | int sig_set = 0; | |
298 | int cipher_name_set = 0; | |
87c94c4d | 299 | int fn_cipher_name_set = 0; |
237fead6 MH |
300 | int cipher_key_bytes; |
301 | int cipher_key_bytes_set = 0; | |
87c94c4d MH |
302 | int fn_cipher_key_bytes; |
303 | int fn_cipher_key_bytes_set = 0; | |
237fead6 | 304 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = |
2ccde7c6 | 305 | &sbi->mount_crypt_stat; |
237fead6 MH |
306 | substring_t args[MAX_OPT_ARGS]; |
307 | int token; | |
308 | char *sig_src; | |
237fead6 MH |
309 | char *cipher_name_dst; |
310 | char *cipher_name_src; | |
87c94c4d MH |
311 | char *fn_cipher_name_dst; |
312 | char *fn_cipher_name_src; | |
313 | char *fnek_dst; | |
314 | char *fnek_src; | |
237fead6 | 315 | char *cipher_key_bytes_src; |
87c94c4d | 316 | char *fn_cipher_key_bytes_src; |
237fead6 MH |
317 | |
318 | if (!options) { | |
319 | rc = -EINVAL; | |
320 | goto out; | |
321 | } | |
956159c3 | 322 | ecryptfs_init_mount_crypt_stat(mount_crypt_stat); |
237fead6 MH |
323 | while ((p = strsep(&options, ",")) != NULL) { |
324 | if (!*p) | |
325 | continue; | |
326 | token = match_token(p, tokens, args); | |
327 | switch (token) { | |
328 | case ecryptfs_opt_sig: | |
329 | case ecryptfs_opt_ecryptfs_sig: | |
330 | sig_src = args[0].from; | |
f4aad16a | 331 | rc = ecryptfs_add_global_auth_tok(mount_crypt_stat, |
84814d64 | 332 | sig_src, 0); |
f4aad16a MH |
333 | if (rc) { |
334 | printk(KERN_ERR "Error attempting to register " | |
335 | "global sig; rc = [%d]\n", rc); | |
336 | goto out; | |
337 | } | |
237fead6 MH |
338 | sig_set = 1; |
339 | break; | |
237fead6 MH |
340 | case ecryptfs_opt_cipher: |
341 | case ecryptfs_opt_ecryptfs_cipher: | |
342 | cipher_name_src = args[0].from; | |
343 | cipher_name_dst = | |
344 | mount_crypt_stat-> | |
345 | global_default_cipher_name; | |
346 | strncpy(cipher_name_dst, cipher_name_src, | |
347 | ECRYPTFS_MAX_CIPHER_NAME_SIZE); | |
87c94c4d | 348 | cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0'; |
237fead6 MH |
349 | cipher_name_set = 1; |
350 | break; | |
351 | case ecryptfs_opt_ecryptfs_key_bytes: | |
352 | cipher_key_bytes_src = args[0].from; | |
353 | cipher_key_bytes = | |
354 | (int)simple_strtol(cipher_key_bytes_src, | |
355 | &cipher_key_bytes_src, 0); | |
356 | mount_crypt_stat->global_default_cipher_key_size = | |
357 | cipher_key_bytes; | |
237fead6 MH |
358 | cipher_key_bytes_set = 1; |
359 | break; | |
360 | case ecryptfs_opt_passthrough: | |
361 | mount_crypt_stat->flags |= | |
362 | ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED; | |
363 | break; | |
17398957 MH |
364 | case ecryptfs_opt_xattr_metadata: |
365 | mount_crypt_stat->flags |= | |
366 | ECRYPTFS_XATTR_METADATA_ENABLED; | |
367 | break; | |
368 | case ecryptfs_opt_encrypted_view: | |
369 | mount_crypt_stat->flags |= | |
370 | ECRYPTFS_XATTR_METADATA_ENABLED; | |
371 | mount_crypt_stat->flags |= | |
372 | ECRYPTFS_ENCRYPTED_VIEW_ENABLED; | |
373 | break; | |
87c94c4d MH |
374 | case ecryptfs_opt_fnek_sig: |
375 | fnek_src = args[0].from; | |
376 | fnek_dst = | |
377 | mount_crypt_stat->global_default_fnek_sig; | |
378 | strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX); | |
379 | mount_crypt_stat->global_default_fnek_sig[ | |
380 | ECRYPTFS_SIG_SIZE_HEX] = '\0'; | |
381 | rc = ecryptfs_add_global_auth_tok( | |
382 | mount_crypt_stat, | |
84814d64 TH |
383 | mount_crypt_stat->global_default_fnek_sig, |
384 | ECRYPTFS_AUTH_TOK_FNEK); | |
87c94c4d MH |
385 | if (rc) { |
386 | printk(KERN_ERR "Error attempting to register " | |
387 | "global fnek sig [%s]; rc = [%d]\n", | |
388 | mount_crypt_stat->global_default_fnek_sig, | |
389 | rc); | |
390 | goto out; | |
391 | } | |
392 | mount_crypt_stat->flags |= | |
393 | (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES | |
394 | | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK); | |
395 | break; | |
396 | case ecryptfs_opt_fn_cipher: | |
397 | fn_cipher_name_src = args[0].from; | |
398 | fn_cipher_name_dst = | |
399 | mount_crypt_stat->global_default_fn_cipher_name; | |
400 | strncpy(fn_cipher_name_dst, fn_cipher_name_src, | |
401 | ECRYPTFS_MAX_CIPHER_NAME_SIZE); | |
402 | mount_crypt_stat->global_default_fn_cipher_name[ | |
403 | ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0'; | |
404 | fn_cipher_name_set = 1; | |
405 | break; | |
406 | case ecryptfs_opt_fn_cipher_key_bytes: | |
407 | fn_cipher_key_bytes_src = args[0].from; | |
408 | fn_cipher_key_bytes = | |
409 | (int)simple_strtol(fn_cipher_key_bytes_src, | |
410 | &fn_cipher_key_bytes_src, 0); | |
411 | mount_crypt_stat->global_default_fn_cipher_key_bytes = | |
412 | fn_cipher_key_bytes; | |
413 | fn_cipher_key_bytes_set = 1; | |
414 | break; | |
e77cc8d2 TH |
415 | case ecryptfs_opt_unlink_sigs: |
416 | mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS; | |
417 | break; | |
f16feb51 RS |
418 | case ecryptfs_opt_mount_auth_tok_only: |
419 | mount_crypt_stat->flags |= | |
420 | ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY; | |
421 | break; | |
237fead6 MH |
422 | case ecryptfs_opt_err: |
423 | default: | |
87c94c4d MH |
424 | printk(KERN_WARNING |
425 | "%s: eCryptfs: unrecognized option [%s]\n", | |
426 | __func__, p); | |
237fead6 MH |
427 | } |
428 | } | |
237fead6 MH |
429 | if (!sig_set) { |
430 | rc = -EINVAL; | |
956159c3 MH |
431 | ecryptfs_printk(KERN_ERR, "You must supply at least one valid " |
432 | "auth tok signature as a mount " | |
237fead6 MH |
433 | "parameter; see the eCryptfs README\n"); |
434 | goto out; | |
435 | } | |
436 | if (!cipher_name_set) { | |
8f236809 MS |
437 | int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER); |
438 | ||
439 | BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE); | |
8f236809 MS |
440 | strcpy(mount_crypt_stat->global_default_cipher_name, |
441 | ECRYPTFS_DEFAULT_CIPHER); | |
237fead6 | 442 | } |
87c94c4d MH |
443 | if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
444 | && !fn_cipher_name_set) | |
445 | strcpy(mount_crypt_stat->global_default_fn_cipher_name, | |
446 | mount_crypt_stat->global_default_cipher_name); | |
447 | if (!cipher_key_bytes_set) | |
e5d9cbde | 448 | mount_crypt_stat->global_default_cipher_key_size = 0; |
87c94c4d MH |
449 | if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
450 | && !fn_cipher_key_bytes_set) | |
451 | mount_crypt_stat->global_default_fn_cipher_key_bytes = | |
452 | mount_crypt_stat->global_default_cipher_key_size; | |
af440f52 ES |
453 | mutex_lock(&key_tfm_list_mutex); |
454 | if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name, | |
87c94c4d | 455 | NULL)) { |
af440f52 ES |
456 | rc = ecryptfs_add_new_key_tfm( |
457 | NULL, mount_crypt_stat->global_default_cipher_name, | |
458 | mount_crypt_stat->global_default_cipher_key_size); | |
87c94c4d MH |
459 | if (rc) { |
460 | printk(KERN_ERR "Error attempting to initialize " | |
461 | "cipher with name = [%s] and key size = [%td]; " | |
462 | "rc = [%d]\n", | |
463 | mount_crypt_stat->global_default_cipher_name, | |
464 | mount_crypt_stat->global_default_cipher_key_size, | |
465 | rc); | |
466 | rc = -EINVAL; | |
467 | mutex_unlock(&key_tfm_list_mutex); | |
468 | goto out; | |
469 | } | |
470 | } | |
471 | if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) | |
472 | && !ecryptfs_tfm_exists( | |
473 | mount_crypt_stat->global_default_fn_cipher_name, NULL)) { | |
474 | rc = ecryptfs_add_new_key_tfm( | |
475 | NULL, mount_crypt_stat->global_default_fn_cipher_name, | |
476 | mount_crypt_stat->global_default_fn_cipher_key_bytes); | |
477 | if (rc) { | |
478 | printk(KERN_ERR "Error attempting to initialize " | |
479 | "cipher with name = [%s] and key size = [%td]; " | |
480 | "rc = [%d]\n", | |
481 | mount_crypt_stat->global_default_fn_cipher_name, | |
482 | mount_crypt_stat->global_default_fn_cipher_key_bytes, | |
483 | rc); | |
484 | rc = -EINVAL; | |
485 | mutex_unlock(&key_tfm_list_mutex); | |
486 | goto out; | |
487 | } | |
237fead6 | 488 | } |
87c94c4d | 489 | mutex_unlock(&key_tfm_list_mutex); |
5dda6992 | 490 | rc = ecryptfs_init_global_auth_toks(mount_crypt_stat); |
87c94c4d | 491 | if (rc) |
f4aad16a MH |
492 | printk(KERN_WARNING "One or more global auth toks could not " |
493 | "properly register; rc = [%d]\n", rc); | |
237fead6 MH |
494 | out: |
495 | return rc; | |
496 | } | |
497 | ||
498 | struct kmem_cache *ecryptfs_sb_info_cache; | |
4403158b | 499 | static struct file_system_type ecryptfs_fs_type; |
237fead6 | 500 | |
237fead6 MH |
501 | /** |
502 | * ecryptfs_get_sb | |
503 | * @fs_type | |
504 | * @flags | |
505 | * @dev_name: The path to mount over | |
506 | * @raw_data: The options passed into the kernel | |
237fead6 | 507 | */ |
4d143beb AV |
508 | static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags, |
509 | const char *dev_name, void *raw_data) | |
237fead6 | 510 | { |
2ccde7c6 AV |
511 | struct super_block *s; |
512 | struct ecryptfs_sb_info *sbi; | |
513 | struct ecryptfs_dentry_info *root_info; | |
514 | const char *err = "Getting sb failed"; | |
66cb7666 AV |
515 | struct inode *inode; |
516 | struct path path; | |
237fead6 | 517 | int rc; |
237fead6 | 518 | |
2ccde7c6 AV |
519 | sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL); |
520 | if (!sbi) { | |
521 | rc = -ENOMEM; | |
237fead6 MH |
522 | goto out; |
523 | } | |
2ccde7c6 AV |
524 | |
525 | rc = ecryptfs_parse_options(sbi, raw_data); | |
237fead6 | 526 | if (rc) { |
2ccde7c6 AV |
527 | err = "Error parsing options"; |
528 | goto out; | |
237fead6 | 529 | } |
2ccde7c6 AV |
530 | |
531 | s = sget(fs_type, NULL, set_anon_super, NULL); | |
532 | if (IS_ERR(s)) { | |
533 | rc = PTR_ERR(s); | |
534 | goto out; | |
535 | } | |
536 | ||
537 | s->s_flags = flags; | |
538 | rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY); | |
66cb7666 AV |
539 | if (rc) |
540 | goto out1; | |
2ccde7c6 AV |
541 | |
542 | ecryptfs_set_superblock_private(s, sbi); | |
543 | s->s_bdi = &sbi->bdi; | |
544 | ||
545 | /* ->kill_sb() will take care of sbi after that point */ | |
546 | sbi = NULL; | |
547 | s->s_op = &ecryptfs_sops; | |
66cb7666 | 548 | s->s_d_op = &ecryptfs_dops; |
2ccde7c6 | 549 | |
66cb7666 AV |
550 | err = "Reading sb failed"; |
551 | rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); | |
552 | if (rc) { | |
553 | ecryptfs_printk(KERN_WARNING, "kern_path() failed\n"); | |
554 | goto out1; | |
555 | } | |
556 | if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) { | |
557 | rc = -EINVAL; | |
558 | printk(KERN_ERR "Mount on filesystem of type " | |
559 | "eCryptfs explicitly disallowed due to " | |
560 | "known incompatibilities\n"); | |
561 | goto out_free; | |
562 | } | |
563 | ecryptfs_set_superblock_lower(s, path.dentry->d_sb); | |
564 | s->s_maxbytes = path.dentry->d_sb->s_maxbytes; | |
565 | s->s_blocksize = path.dentry->d_sb->s_blocksize; | |
070baa51 | 566 | s->s_magic = ECRYPTFS_SUPER_MAGIC; |
66cb7666 AV |
567 | |
568 | inode = ecryptfs_get_inode(path.dentry->d_inode, s); | |
569 | rc = PTR_ERR(inode); | |
570 | if (IS_ERR(inode)) | |
571 | goto out_free; | |
572 | ||
573 | s->s_root = d_alloc_root(inode); | |
2ccde7c6 | 574 | if (!s->s_root) { |
66cb7666 AV |
575 | iput(inode); |
576 | rc = -ENOMEM; | |
577 | goto out_free; | |
2ccde7c6 | 578 | } |
2ccde7c6 | 579 | |
66cb7666 | 580 | rc = -ENOMEM; |
2ccde7c6 | 581 | root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
66cb7666 AV |
582 | if (!root_info) |
583 | goto out_free; | |
584 | ||
2ccde7c6 AV |
585 | /* ->kill_sb() will take care of root_info */ |
586 | ecryptfs_set_dentry_private(s->s_root, root_info); | |
66cb7666 AV |
587 | ecryptfs_set_dentry_lower(s->s_root, path.dentry); |
588 | ecryptfs_set_dentry_lower_mnt(s->s_root, path.mnt); | |
589 | ||
2ccde7c6 | 590 | s->s_flags |= MS_ACTIVE; |
4d143beb | 591 | return dget(s->s_root); |
2ccde7c6 | 592 | |
66cb7666 AV |
593 | out_free: |
594 | path_put(&path); | |
595 | out1: | |
596 | deactivate_locked_super(s); | |
237fead6 | 597 | out: |
2ccde7c6 AV |
598 | if (sbi) { |
599 | ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat); | |
600 | kmem_cache_free(ecryptfs_sb_info_cache, sbi); | |
601 | } | |
602 | printk(KERN_ERR "%s; rc = [%d]\n", err, rc); | |
4d143beb | 603 | return ERR_PTR(rc); |
237fead6 MH |
604 | } |
605 | ||
606 | /** | |
607 | * ecryptfs_kill_block_super | |
608 | * @sb: The ecryptfs super block | |
609 | * | |
610 | * Used to bring the superblock down and free the private data. | |
237fead6 MH |
611 | */ |
612 | static void ecryptfs_kill_block_super(struct super_block *sb) | |
613 | { | |
decabd66 AV |
614 | struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb); |
615 | kill_anon_super(sb); | |
616 | if (!sb_info) | |
617 | return; | |
618 | ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat); | |
619 | bdi_destroy(&sb_info->bdi); | |
620 | kmem_cache_free(ecryptfs_sb_info_cache, sb_info); | |
237fead6 MH |
621 | } |
622 | ||
623 | static struct file_system_type ecryptfs_fs_type = { | |
624 | .owner = THIS_MODULE, | |
625 | .name = "ecryptfs", | |
4d143beb | 626 | .mount = ecryptfs_mount, |
237fead6 MH |
627 | .kill_sb = ecryptfs_kill_block_super, |
628 | .fs_flags = 0 | |
629 | }; | |
630 | ||
631 | /** | |
632 | * inode_info_init_once | |
633 | * | |
634 | * Initializes the ecryptfs_inode_info_cache when it is created | |
635 | */ | |
636 | static void | |
51cc5068 | 637 | inode_info_init_once(void *vptr) |
237fead6 MH |
638 | { |
639 | struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr; | |
640 | ||
a35afb83 | 641 | inode_init_once(&ei->vfs_inode); |
237fead6 MH |
642 | } |
643 | ||
644 | static struct ecryptfs_cache_info { | |
e18b890b | 645 | struct kmem_cache **cache; |
237fead6 MH |
646 | const char *name; |
647 | size_t size; | |
51cc5068 | 648 | void (*ctor)(void *obj); |
237fead6 MH |
649 | } ecryptfs_cache_infos[] = { |
650 | { | |
651 | .cache = &ecryptfs_auth_tok_list_item_cache, | |
652 | .name = "ecryptfs_auth_tok_list_item", | |
653 | .size = sizeof(struct ecryptfs_auth_tok_list_item), | |
654 | }, | |
655 | { | |
656 | .cache = &ecryptfs_file_info_cache, | |
657 | .name = "ecryptfs_file_cache", | |
658 | .size = sizeof(struct ecryptfs_file_info), | |
659 | }, | |
660 | { | |
661 | .cache = &ecryptfs_dentry_info_cache, | |
662 | .name = "ecryptfs_dentry_info_cache", | |
663 | .size = sizeof(struct ecryptfs_dentry_info), | |
664 | }, | |
665 | { | |
666 | .cache = &ecryptfs_inode_info_cache, | |
667 | .name = "ecryptfs_inode_cache", | |
668 | .size = sizeof(struct ecryptfs_inode_info), | |
669 | .ctor = inode_info_init_once, | |
670 | }, | |
671 | { | |
672 | .cache = &ecryptfs_sb_info_cache, | |
673 | .name = "ecryptfs_sb_cache", | |
674 | .size = sizeof(struct ecryptfs_sb_info), | |
675 | }, | |
237fead6 MH |
676 | { |
677 | .cache = &ecryptfs_header_cache_1, | |
678 | .name = "ecryptfs_headers_1", | |
679 | .size = PAGE_CACHE_SIZE, | |
680 | }, | |
681 | { | |
682 | .cache = &ecryptfs_header_cache_2, | |
683 | .name = "ecryptfs_headers_2", | |
684 | .size = PAGE_CACHE_SIZE, | |
685 | }, | |
dd2a3b7a MH |
686 | { |
687 | .cache = &ecryptfs_xattr_cache, | |
688 | .name = "ecryptfs_xattr_cache", | |
689 | .size = PAGE_CACHE_SIZE, | |
690 | }, | |
eb95e7ff MH |
691 | { |
692 | .cache = &ecryptfs_key_record_cache, | |
693 | .name = "ecryptfs_key_record_cache", | |
694 | .size = sizeof(struct ecryptfs_key_record), | |
695 | }, | |
956159c3 MH |
696 | { |
697 | .cache = &ecryptfs_key_sig_cache, | |
698 | .name = "ecryptfs_key_sig_cache", | |
699 | .size = sizeof(struct ecryptfs_key_sig), | |
700 | }, | |
701 | { | |
702 | .cache = &ecryptfs_global_auth_tok_cache, | |
703 | .name = "ecryptfs_global_auth_tok_cache", | |
704 | .size = sizeof(struct ecryptfs_global_auth_tok), | |
705 | }, | |
706 | { | |
707 | .cache = &ecryptfs_key_tfm_cache, | |
708 | .name = "ecryptfs_key_tfm_cache", | |
709 | .size = sizeof(struct ecryptfs_key_tfm), | |
710 | }, | |
746f1e55 MH |
711 | { |
712 | .cache = &ecryptfs_open_req_cache, | |
713 | .name = "ecryptfs_open_req_cache", | |
714 | .size = sizeof(struct ecryptfs_open_req), | |
715 | }, | |
237fead6 MH |
716 | }; |
717 | ||
718 | static void ecryptfs_free_kmem_caches(void) | |
719 | { | |
720 | int i; | |
721 | ||
722 | for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { | |
723 | struct ecryptfs_cache_info *info; | |
724 | ||
725 | info = &ecryptfs_cache_infos[i]; | |
726 | if (*(info->cache)) | |
727 | kmem_cache_destroy(*(info->cache)); | |
728 | } | |
729 | } | |
730 | ||
731 | /** | |
732 | * ecryptfs_init_kmem_caches | |
733 | * | |
734 | * Returns zero on success; non-zero otherwise | |
735 | */ | |
736 | static int ecryptfs_init_kmem_caches(void) | |
737 | { | |
738 | int i; | |
739 | ||
740 | for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { | |
741 | struct ecryptfs_cache_info *info; | |
742 | ||
743 | info = &ecryptfs_cache_infos[i]; | |
744 | *(info->cache) = kmem_cache_create(info->name, info->size, | |
20c2df83 | 745 | 0, SLAB_HWCACHE_ALIGN, info->ctor); |
237fead6 MH |
746 | if (!*(info->cache)) { |
747 | ecryptfs_free_kmem_caches(); | |
748 | ecryptfs_printk(KERN_WARNING, "%s: " | |
749 | "kmem_cache_create failed\n", | |
750 | info->name); | |
751 | return -ENOMEM; | |
752 | } | |
753 | } | |
754 | return 0; | |
755 | } | |
756 | ||
6e90aa97 | 757 | static struct kobject *ecryptfs_kobj; |
237fead6 | 758 | |
386f275f KS |
759 | static ssize_t version_show(struct kobject *kobj, |
760 | struct kobj_attribute *attr, char *buff) | |
237fead6 MH |
761 | { |
762 | return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK); | |
763 | } | |
764 | ||
386f275f | 765 | static struct kobj_attribute version_attr = __ATTR_RO(version); |
237fead6 | 766 | |
30a468b1 GKH |
767 | static struct attribute *attributes[] = { |
768 | &version_attr.attr, | |
30a468b1 GKH |
769 | NULL, |
770 | }; | |
771 | ||
772 | static struct attribute_group attr_group = { | |
773 | .attrs = attributes, | |
774 | }; | |
237fead6 MH |
775 | |
776 | static int do_sysfs_registration(void) | |
777 | { | |
778 | int rc; | |
779 | ||
6e90aa97 GKH |
780 | ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj); |
781 | if (!ecryptfs_kobj) { | |
917e865d GKH |
782 | printk(KERN_ERR "Unable to create ecryptfs kset\n"); |
783 | rc = -ENOMEM; | |
237fead6 MH |
784 | goto out; |
785 | } | |
6e90aa97 | 786 | rc = sysfs_create_group(ecryptfs_kobj, &attr_group); |
237fead6 MH |
787 | if (rc) { |
788 | printk(KERN_ERR | |
30a468b1 | 789 | "Unable to create ecryptfs version attributes\n"); |
197b12d6 | 790 | kobject_put(ecryptfs_kobj); |
237fead6 MH |
791 | } |
792 | out: | |
793 | return rc; | |
794 | } | |
795 | ||
a75de1b3 RK |
796 | static void do_sysfs_unregistration(void) |
797 | { | |
6e90aa97 | 798 | sysfs_remove_group(ecryptfs_kobj, &attr_group); |
197b12d6 | 799 | kobject_put(ecryptfs_kobj); |
a75de1b3 RK |
800 | } |
801 | ||
237fead6 MH |
802 | static int __init ecryptfs_init(void) |
803 | { | |
804 | int rc; | |
805 | ||
806 | if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) { | |
807 | rc = -EINVAL; | |
808 | ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is " | |
809 | "larger than the host's page size, and so " | |
810 | "eCryptfs cannot run on this system. The " | |
888d57bb JP |
811 | "default eCryptfs extent size is [%u] bytes; " |
812 | "the page size is [%lu] bytes.\n", | |
813 | ECRYPTFS_DEFAULT_EXTENT_SIZE, | |
814 | (unsigned long)PAGE_CACHE_SIZE); | |
237fead6 MH |
815 | goto out; |
816 | } | |
817 | rc = ecryptfs_init_kmem_caches(); | |
818 | if (rc) { | |
819 | printk(KERN_ERR | |
820 | "Failed to allocate one or more kmem_cache objects\n"); | |
821 | goto out; | |
822 | } | |
823 | rc = register_filesystem(&ecryptfs_fs_type); | |
824 | if (rc) { | |
825 | printk(KERN_ERR "Failed to register filesystem\n"); | |
cf81f89d | 826 | goto out_free_kmem_caches; |
237fead6 | 827 | } |
237fead6 MH |
828 | rc = do_sysfs_registration(); |
829 | if (rc) { | |
830 | printk(KERN_ERR "sysfs registration failed\n"); | |
cf81f89d | 831 | goto out_unregister_filesystem; |
237fead6 | 832 | } |
746f1e55 MH |
833 | rc = ecryptfs_init_kthread(); |
834 | if (rc) { | |
835 | printk(KERN_ERR "%s: kthread initialization failed; " | |
836 | "rc = [%d]\n", __func__, rc); | |
837 | goto out_do_sysfs_unregistration; | |
838 | } | |
624ae528 | 839 | rc = ecryptfs_init_messaging(); |
dddfa461 | 840 | if (rc) { |
746f1e55 | 841 | printk(KERN_ERR "Failure occured while attempting to " |
624ae528 TH |
842 | "initialize the communications channel to " |
843 | "ecryptfsd\n"); | |
746f1e55 | 844 | goto out_destroy_kthread; |
956159c3 MH |
845 | } |
846 | rc = ecryptfs_init_crypto(); | |
847 | if (rc) { | |
848 | printk(KERN_ERR "Failure whilst attempting to init crypto; " | |
849 | "rc = [%d]\n", rc); | |
cf81f89d | 850 | goto out_release_messaging; |
dddfa461 | 851 | } |
2830bfd6 ES |
852 | if (ecryptfs_verbosity > 0) |
853 | printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values " | |
854 | "will be written to the syslog!\n", ecryptfs_verbosity); | |
855 | ||
cf81f89d MH |
856 | goto out; |
857 | out_release_messaging: | |
624ae528 | 858 | ecryptfs_release_messaging(); |
746f1e55 MH |
859 | out_destroy_kthread: |
860 | ecryptfs_destroy_kthread(); | |
cf81f89d MH |
861 | out_do_sysfs_unregistration: |
862 | do_sysfs_unregistration(); | |
863 | out_unregister_filesystem: | |
864 | unregister_filesystem(&ecryptfs_fs_type); | |
865 | out_free_kmem_caches: | |
866 | ecryptfs_free_kmem_caches(); | |
237fead6 MH |
867 | out: |
868 | return rc; | |
869 | } | |
870 | ||
871 | static void __exit ecryptfs_exit(void) | |
872 | { | |
cf81f89d MH |
873 | int rc; |
874 | ||
875 | rc = ecryptfs_destroy_crypto(); | |
876 | if (rc) | |
877 | printk(KERN_ERR "Failure whilst attempting to destroy crypto; " | |
878 | "rc = [%d]\n", rc); | |
624ae528 | 879 | ecryptfs_release_messaging(); |
746f1e55 | 880 | ecryptfs_destroy_kthread(); |
cf81f89d | 881 | do_sysfs_unregistration(); |
237fead6 MH |
882 | unregister_filesystem(&ecryptfs_fs_type); |
883 | ecryptfs_free_kmem_caches(); | |
884 | } | |
885 | ||
886 | MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>"); | |
887 | MODULE_DESCRIPTION("eCryptfs"); | |
888 | ||
889 | MODULE_LICENSE("GPL"); | |
890 | ||
891 | module_init(ecryptfs_init) | |
892 | module_exit(ecryptfs_exit) |