Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 1 | /** |
| 2 | * eCryptfs: Linux filesystem encryption layer |
| 3 | * |
| 4 | * Copyright (C) 1997-2003 Erez Zadok |
| 5 | * Copyright (C) 2001-2003 Stony Brook University |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 6 | * Copyright (C) 2004-2007 International Business Machines Corp. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 7 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
| 8 | * Michael C. Thompson <mcthomps@us.ibm.com> |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 9 | * Tyler Hicks <tyhicks@ou.edu> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 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> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 33 | #include <linux/mount.h> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 34 | #include <linux/pagemap.h> |
| 35 | #include <linux/key.h> |
| 36 | #include <linux/parser.h> |
Josef "Jeff" Sipek | 0cc72dc | 2006-12-08 02:36:31 -0800 | [diff] [blame] | 37 | #include <linux/fs_stack.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 38 | #include <linux/slab.h> |
Roberto Sassu | 070baa5 | 2010-11-03 11:11:22 +0100 | [diff] [blame] | 39 | #include <linux/magic.h> |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 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 | |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 52 | /** |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 53 | * Module parameter that defines the number of message buffer elements |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 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 |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 63 | * for a response from ecryptfsd. The actual sleep time will be, more than |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 64 | * likely, a small amount greater than this specified value, but only less if |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 65 | * the message successfully arrives. |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 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 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 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 | |
| 98 | /** |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 99 | * ecryptfs_init_lower_file |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 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 |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 107 | * lower file struct and associates it with the eCryptfs |
| 108 | * inode. When all eCryptfs files associated with the inode are released, the |
| 109 | * file is closed. |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 110 | * |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 111 | * The lower file will be opened with read/write permissions, if |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 112 | * possible. Otherwise, it is opened read-only. |
| 113 | * |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 114 | * This function does nothing if a lower file is already |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 115 | * associated with the eCryptfs inode. |
| 116 | * |
| 117 | * Returns zero on success; non-zero otherwise |
| 118 | */ |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 119 | static int ecryptfs_init_lower_file(struct dentry *dentry, |
| 120 | struct file **lower_file) |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 121 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 122 | const struct cred *cred = current_cred(); |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 123 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
| 124 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); |
| 125 | int rc; |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 126 | |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 127 | rc = ecryptfs_privileged_open(lower_file, lower_dentry, lower_mnt, |
| 128 | cred); |
| 129 | if (rc) { |
| 130 | printk(KERN_ERR "Error opening lower file " |
| 131 | "for lower_dentry [0x%p] and lower_mnt [0x%p]; " |
| 132 | "rc = [%d]\n", lower_dentry, lower_mnt, rc); |
| 133 | (*lower_file) = NULL; |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 134 | } |
Michael Halcrow | 4981e08 | 2007-10-16 01:28:09 -0700 | [diff] [blame] | 135 | return rc; |
| 136 | } |
| 137 | |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 138 | int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode) |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 139 | { |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 140 | struct ecryptfs_inode_info *inode_info; |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 141 | int count, rc = 0; |
| 142 | |
Tyler Hicks | 3b06b3e | 2011-05-24 03:49:02 -0500 | [diff] [blame] | 143 | inode_info = ecryptfs_inode_to_private(inode); |
Tyler Hicks | 332ab16 | 2011-04-14 15:35:11 -0500 | [diff] [blame] | 144 | mutex_lock(&inode_info->lower_file_mutex); |
| 145 | count = atomic_inc_return(&inode_info->lower_file_count); |
| 146 | if (WARN_ON_ONCE(count < 1)) |
| 147 | rc = -EINVAL; |
| 148 | else if (count == 1) { |
| 149 | rc = ecryptfs_init_lower_file(dentry, |
| 150 | &inode_info->lower_file); |
| 151 | if (rc) |
| 152 | atomic_set(&inode_info->lower_file_count, 0); |
| 153 | } |
| 154 | mutex_unlock(&inode_info->lower_file_mutex); |
| 155 | return rc; |
| 156 | } |
| 157 | |
| 158 | void ecryptfs_put_lower_file(struct inode *inode) |
| 159 | { |
| 160 | struct ecryptfs_inode_info *inode_info; |
| 161 | |
| 162 | inode_info = ecryptfs_inode_to_private(inode); |
| 163 | if (atomic_dec_and_mutex_lock(&inode_info->lower_file_count, |
| 164 | &inode_info->lower_file_mutex)) { |
| 165 | fput(inode_info->lower_file); |
| 166 | inode_info->lower_file = NULL; |
| 167 | mutex_unlock(&inode_info->lower_file_mutex); |
| 168 | } |
| 169 | } |
| 170 | |
Eric Sandeen | 2830bfd | 2008-02-06 01:38:34 -0800 | [diff] [blame] | 171 | enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig, |
| 172 | ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher, |
| 173 | ecryptfs_opt_ecryptfs_key_bytes, |
Michael Halcrow | 1739895 | 2007-02-12 00:53:45 -0800 | [diff] [blame] | 174 | ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata, |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 175 | ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig, |
| 176 | ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes, |
Roberto Sassu | f16feb5 | 2010-10-06 18:31:32 +0200 | [diff] [blame] | 177 | ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only, |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame^] | 178 | ecryptfs_opt_check_dev_ruid, |
Roberto Sassu | f16feb5 | 2010-10-06 18:31:32 +0200 | [diff] [blame] | 179 | ecryptfs_opt_err }; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 180 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 181 | static const match_table_t tokens = { |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 182 | {ecryptfs_opt_sig, "sig=%s"}, |
| 183 | {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"}, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 184 | {ecryptfs_opt_cipher, "cipher=%s"}, |
| 185 | {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"}, |
| 186 | {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"}, |
| 187 | {ecryptfs_opt_passthrough, "ecryptfs_passthrough"}, |
Michael Halcrow | 1739895 | 2007-02-12 00:53:45 -0800 | [diff] [blame] | 188 | {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"}, |
| 189 | {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"}, |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 190 | {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"}, |
| 191 | {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"}, |
| 192 | {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"}, |
Tyler Hicks | e77cc8d | 2009-04-22 04:08:46 -0500 | [diff] [blame] | 193 | {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"}, |
Roberto Sassu | f16feb5 | 2010-10-06 18:31:32 +0200 | [diff] [blame] | 194 | {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"}, |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame^] | 195 | {ecryptfs_opt_check_dev_ruid, "ecryptfs_check_dev_ruid"}, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 196 | {ecryptfs_opt_err, NULL} |
| 197 | }; |
| 198 | |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 199 | static int ecryptfs_init_global_auth_toks( |
| 200 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 201 | { |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 202 | struct ecryptfs_global_auth_tok *global_auth_tok; |
Roberto Sassu | 0e1fc5e | 2011-03-21 16:00:53 +0100 | [diff] [blame] | 203 | struct ecryptfs_auth_tok *auth_tok; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 204 | int rc = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 205 | |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 206 | list_for_each_entry(global_auth_tok, |
| 207 | &mount_crypt_stat->global_auth_tok_list, |
| 208 | mount_crypt_stat_list) { |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 209 | rc = ecryptfs_keyring_auth_tok_for_sig( |
Roberto Sassu | 0e1fc5e | 2011-03-21 16:00:53 +0100 | [diff] [blame] | 210 | &global_auth_tok->global_auth_tok_key, &auth_tok, |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 211 | global_auth_tok->sig); |
| 212 | if (rc) { |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 213 | printk(KERN_ERR "Could not find valid key in user " |
| 214 | "session keyring for sig specified in mount " |
| 215 | "option: [%s]\n", global_auth_tok->sig); |
| 216 | global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID; |
Eric Sandeen | 982363c | 2008-07-23 21:30:04 -0700 | [diff] [blame] | 217 | goto out; |
Roberto Sassu | b5695d0 | 2011-03-21 16:00:55 +0100 | [diff] [blame] | 218 | } else { |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 219 | global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID; |
Roberto Sassu | b5695d0 | 2011-03-21 16:00:55 +0100 | [diff] [blame] | 220 | up_write(&(global_auth_tok->global_auth_tok_key)->sem); |
| 221 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 222 | } |
Eric Sandeen | 982363c | 2008-07-23 21:30:04 -0700 | [diff] [blame] | 223 | out: |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 224 | return rc; |
| 225 | } |
| 226 | |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 227 | static void ecryptfs_init_mount_crypt_stat( |
| 228 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat) |
| 229 | { |
| 230 | memset((void *)mount_crypt_stat, 0, |
| 231 | sizeof(struct ecryptfs_mount_crypt_stat)); |
| 232 | INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list); |
| 233 | mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex); |
| 234 | mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED; |
| 235 | } |
| 236 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 237 | /** |
| 238 | * ecryptfs_parse_options |
| 239 | * @sb: The ecryptfs super block |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 240 | * @options: The options passed to the kernel |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame^] | 241 | * @check_ruid: set to 1 if device uid should be checked against the ruid |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 242 | * |
| 243 | * Parse mount options: |
| 244 | * debug=N - ecryptfs_verbosity level for debug output |
| 245 | * sig=XXX - description(signature) of the key to use |
| 246 | * |
| 247 | * Returns the dentry object of the lower-level (lower/interposed) |
| 248 | * directory; We want to mount our stackable file system on top of |
| 249 | * that lower directory. |
| 250 | * |
| 251 | * The signature of the key to use must be the description of a key |
| 252 | * already in the keyring. Mounting will fail if the key can not be |
| 253 | * found. |
| 254 | * |
| 255 | * Returns zero on success; non-zero on error |
| 256 | */ |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame^] | 257 | static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options, |
| 258 | uid_t *check_ruid) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 259 | { |
| 260 | char *p; |
| 261 | int rc = 0; |
| 262 | int sig_set = 0; |
| 263 | int cipher_name_set = 0; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 264 | int fn_cipher_name_set = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 265 | int cipher_key_bytes; |
| 266 | int cipher_key_bytes_set = 0; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 267 | int fn_cipher_key_bytes; |
| 268 | int fn_cipher_key_bytes_set = 0; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 269 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 270 | &sbi->mount_crypt_stat; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 271 | substring_t args[MAX_OPT_ARGS]; |
| 272 | int token; |
| 273 | char *sig_src; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 274 | char *cipher_name_dst; |
| 275 | char *cipher_name_src; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 276 | char *fn_cipher_name_dst; |
| 277 | char *fn_cipher_name_src; |
| 278 | char *fnek_dst; |
| 279 | char *fnek_src; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 280 | char *cipher_key_bytes_src; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 281 | char *fn_cipher_key_bytes_src; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 282 | |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame^] | 283 | *check_ruid = 0; |
| 284 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 285 | if (!options) { |
| 286 | rc = -EINVAL; |
| 287 | goto out; |
| 288 | } |
Michael Halcrow | 956159c | 2007-10-16 01:27:55 -0700 | [diff] [blame] | 289 | ecryptfs_init_mount_crypt_stat(mount_crypt_stat); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 290 | while ((p = strsep(&options, ",")) != NULL) { |
| 291 | if (!*p) |
| 292 | continue; |
| 293 | token = match_token(p, tokens, args); |
| 294 | switch (token) { |
| 295 | case ecryptfs_opt_sig: |
| 296 | case ecryptfs_opt_ecryptfs_sig: |
| 297 | sig_src = args[0].from; |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 298 | rc = ecryptfs_add_global_auth_tok(mount_crypt_stat, |
Tyler Hicks | 84814d6 | 2009-03-13 13:51:59 -0700 | [diff] [blame] | 299 | sig_src, 0); |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 300 | if (rc) { |
| 301 | printk(KERN_ERR "Error attempting to register " |
| 302 | "global sig; rc = [%d]\n", rc); |
| 303 | goto out; |
| 304 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 305 | sig_set = 1; |
| 306 | break; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 307 | case ecryptfs_opt_cipher: |
| 308 | case ecryptfs_opt_ecryptfs_cipher: |
| 309 | cipher_name_src = args[0].from; |
| 310 | cipher_name_dst = |
| 311 | mount_crypt_stat-> |
| 312 | global_default_cipher_name; |
| 313 | strncpy(cipher_name_dst, cipher_name_src, |
| 314 | ECRYPTFS_MAX_CIPHER_NAME_SIZE); |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 315 | cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0'; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 316 | cipher_name_set = 1; |
| 317 | break; |
| 318 | case ecryptfs_opt_ecryptfs_key_bytes: |
| 319 | cipher_key_bytes_src = args[0].from; |
| 320 | cipher_key_bytes = |
| 321 | (int)simple_strtol(cipher_key_bytes_src, |
| 322 | &cipher_key_bytes_src, 0); |
| 323 | mount_crypt_stat->global_default_cipher_key_size = |
| 324 | cipher_key_bytes; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 325 | cipher_key_bytes_set = 1; |
| 326 | break; |
| 327 | case ecryptfs_opt_passthrough: |
| 328 | mount_crypt_stat->flags |= |
| 329 | ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED; |
| 330 | break; |
Michael Halcrow | 1739895 | 2007-02-12 00:53:45 -0800 | [diff] [blame] | 331 | case ecryptfs_opt_xattr_metadata: |
| 332 | mount_crypt_stat->flags |= |
| 333 | ECRYPTFS_XATTR_METADATA_ENABLED; |
| 334 | break; |
| 335 | case ecryptfs_opt_encrypted_view: |
| 336 | mount_crypt_stat->flags |= |
| 337 | ECRYPTFS_XATTR_METADATA_ENABLED; |
| 338 | mount_crypt_stat->flags |= |
| 339 | ECRYPTFS_ENCRYPTED_VIEW_ENABLED; |
| 340 | break; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 341 | case ecryptfs_opt_fnek_sig: |
| 342 | fnek_src = args[0].from; |
| 343 | fnek_dst = |
| 344 | mount_crypt_stat->global_default_fnek_sig; |
| 345 | strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX); |
| 346 | mount_crypt_stat->global_default_fnek_sig[ |
| 347 | ECRYPTFS_SIG_SIZE_HEX] = '\0'; |
| 348 | rc = ecryptfs_add_global_auth_tok( |
| 349 | mount_crypt_stat, |
Tyler Hicks | 84814d6 | 2009-03-13 13:51:59 -0700 | [diff] [blame] | 350 | mount_crypt_stat->global_default_fnek_sig, |
| 351 | ECRYPTFS_AUTH_TOK_FNEK); |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 352 | if (rc) { |
| 353 | printk(KERN_ERR "Error attempting to register " |
| 354 | "global fnek sig [%s]; rc = [%d]\n", |
| 355 | mount_crypt_stat->global_default_fnek_sig, |
| 356 | rc); |
| 357 | goto out; |
| 358 | } |
| 359 | mount_crypt_stat->flags |= |
| 360 | (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES |
| 361 | | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK); |
| 362 | break; |
| 363 | case ecryptfs_opt_fn_cipher: |
| 364 | fn_cipher_name_src = args[0].from; |
| 365 | fn_cipher_name_dst = |
| 366 | mount_crypt_stat->global_default_fn_cipher_name; |
| 367 | strncpy(fn_cipher_name_dst, fn_cipher_name_src, |
| 368 | ECRYPTFS_MAX_CIPHER_NAME_SIZE); |
| 369 | mount_crypt_stat->global_default_fn_cipher_name[ |
| 370 | ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0'; |
| 371 | fn_cipher_name_set = 1; |
| 372 | break; |
| 373 | case ecryptfs_opt_fn_cipher_key_bytes: |
| 374 | fn_cipher_key_bytes_src = args[0].from; |
| 375 | fn_cipher_key_bytes = |
| 376 | (int)simple_strtol(fn_cipher_key_bytes_src, |
| 377 | &fn_cipher_key_bytes_src, 0); |
| 378 | mount_crypt_stat->global_default_fn_cipher_key_bytes = |
| 379 | fn_cipher_key_bytes; |
| 380 | fn_cipher_key_bytes_set = 1; |
| 381 | break; |
Tyler Hicks | e77cc8d | 2009-04-22 04:08:46 -0500 | [diff] [blame] | 382 | case ecryptfs_opt_unlink_sigs: |
| 383 | mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS; |
| 384 | break; |
Roberto Sassu | f16feb5 | 2010-10-06 18:31:32 +0200 | [diff] [blame] | 385 | case ecryptfs_opt_mount_auth_tok_only: |
| 386 | mount_crypt_stat->flags |= |
| 387 | ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY; |
| 388 | break; |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame^] | 389 | case ecryptfs_opt_check_dev_ruid: |
| 390 | *check_ruid = 1; |
| 391 | break; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 392 | case ecryptfs_opt_err: |
| 393 | default: |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 394 | printk(KERN_WARNING |
| 395 | "%s: eCryptfs: unrecognized option [%s]\n", |
| 396 | __func__, p); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 397 | } |
| 398 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 399 | if (!sig_set) { |
| 400 | rc = -EINVAL; |
Michael Halcrow | 956159c | 2007-10-16 01:27:55 -0700 | [diff] [blame] | 401 | ecryptfs_printk(KERN_ERR, "You must supply at least one valid " |
| 402 | "auth tok signature as a mount " |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 403 | "parameter; see the eCryptfs README\n"); |
| 404 | goto out; |
| 405 | } |
| 406 | if (!cipher_name_set) { |
Miklos Szeredi | 8f23680 | 2008-07-23 21:30:05 -0700 | [diff] [blame] | 407 | int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER); |
| 408 | |
| 409 | BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE); |
Miklos Szeredi | 8f23680 | 2008-07-23 21:30:05 -0700 | [diff] [blame] | 410 | strcpy(mount_crypt_stat->global_default_cipher_name, |
| 411 | ECRYPTFS_DEFAULT_CIPHER); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 412 | } |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 413 | if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
| 414 | && !fn_cipher_name_set) |
| 415 | strcpy(mount_crypt_stat->global_default_fn_cipher_name, |
| 416 | mount_crypt_stat->global_default_cipher_name); |
| 417 | if (!cipher_key_bytes_set) |
Michael Halcrow | e5d9cbd | 2006-10-30 22:07:16 -0800 | [diff] [blame] | 418 | mount_crypt_stat->global_default_cipher_key_size = 0; |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 419 | if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
| 420 | && !fn_cipher_key_bytes_set) |
| 421 | mount_crypt_stat->global_default_fn_cipher_key_bytes = |
| 422 | mount_crypt_stat->global_default_cipher_key_size; |
Eric Sandeen | af440f5 | 2008-02-06 01:38:37 -0800 | [diff] [blame] | 423 | mutex_lock(&key_tfm_list_mutex); |
| 424 | if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name, |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 425 | NULL)) { |
Eric Sandeen | af440f5 | 2008-02-06 01:38:37 -0800 | [diff] [blame] | 426 | rc = ecryptfs_add_new_key_tfm( |
| 427 | NULL, mount_crypt_stat->global_default_cipher_name, |
| 428 | mount_crypt_stat->global_default_cipher_key_size); |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 429 | if (rc) { |
| 430 | printk(KERN_ERR "Error attempting to initialize " |
| 431 | "cipher with name = [%s] and key size = [%td]; " |
| 432 | "rc = [%d]\n", |
| 433 | mount_crypt_stat->global_default_cipher_name, |
| 434 | mount_crypt_stat->global_default_cipher_key_size, |
| 435 | rc); |
| 436 | rc = -EINVAL; |
| 437 | mutex_unlock(&key_tfm_list_mutex); |
| 438 | goto out; |
| 439 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 440 | } |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 441 | if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) |
| 442 | && !ecryptfs_tfm_exists( |
| 443 | mount_crypt_stat->global_default_fn_cipher_name, NULL)) { |
| 444 | rc = ecryptfs_add_new_key_tfm( |
| 445 | NULL, mount_crypt_stat->global_default_fn_cipher_name, |
| 446 | mount_crypt_stat->global_default_fn_cipher_key_bytes); |
| 447 | if (rc) { |
| 448 | printk(KERN_ERR "Error attempting to initialize " |
| 449 | "cipher with name = [%s] and key size = [%td]; " |
| 450 | "rc = [%d]\n", |
| 451 | mount_crypt_stat->global_default_fn_cipher_name, |
| 452 | mount_crypt_stat->global_default_fn_cipher_key_bytes, |
| 453 | rc); |
| 454 | rc = -EINVAL; |
| 455 | mutex_unlock(&key_tfm_list_mutex); |
| 456 | goto out; |
| 457 | } |
| 458 | } |
| 459 | mutex_unlock(&key_tfm_list_mutex); |
Michael Halcrow | 5dda699 | 2007-10-16 01:28:06 -0700 | [diff] [blame] | 460 | rc = ecryptfs_init_global_auth_toks(mount_crypt_stat); |
Michael Halcrow | 87c94c4 | 2009-01-06 14:42:01 -0800 | [diff] [blame] | 461 | if (rc) |
Michael Halcrow | f4aad16 | 2007-10-16 01:27:53 -0700 | [diff] [blame] | 462 | printk(KERN_WARNING "One or more global auth toks could not " |
| 463 | "properly register; rc = [%d]\n", rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 464 | out: |
| 465 | return rc; |
| 466 | } |
| 467 | |
| 468 | struct kmem_cache *ecryptfs_sb_info_cache; |
Al Viro | 4403158 | 2010-05-17 00:59:46 -0400 | [diff] [blame] | 469 | static struct file_system_type ecryptfs_fs_type; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 470 | |
| 471 | /** |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 472 | * ecryptfs_get_sb |
| 473 | * @fs_type |
| 474 | * @flags |
| 475 | * @dev_name: The path to mount over |
| 476 | * @raw_data: The options passed into the kernel |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 477 | */ |
Al Viro | 4d143be | 2010-07-26 13:33:36 +0400 | [diff] [blame] | 478 | static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags, |
| 479 | const char *dev_name, void *raw_data) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 480 | { |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 481 | struct super_block *s; |
| 482 | struct ecryptfs_sb_info *sbi; |
| 483 | struct ecryptfs_dentry_info *root_info; |
| 484 | const char *err = "Getting sb failed"; |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 485 | struct inode *inode; |
| 486 | struct path path; |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame^] | 487 | uid_t check_ruid; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 488 | int rc; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 489 | |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 490 | sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL); |
| 491 | if (!sbi) { |
| 492 | rc = -ENOMEM; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 493 | goto out; |
| 494 | } |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 495 | |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame^] | 496 | rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 497 | if (rc) { |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 498 | err = "Error parsing options"; |
| 499 | goto out; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 500 | } |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 501 | |
| 502 | s = sget(fs_type, NULL, set_anon_super, NULL); |
| 503 | if (IS_ERR(s)) { |
| 504 | rc = PTR_ERR(s); |
| 505 | goto out; |
| 506 | } |
| 507 | |
| 508 | s->s_flags = flags; |
| 509 | rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY); |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 510 | if (rc) |
| 511 | goto out1; |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 512 | |
| 513 | ecryptfs_set_superblock_private(s, sbi); |
| 514 | s->s_bdi = &sbi->bdi; |
| 515 | |
| 516 | /* ->kill_sb() will take care of sbi after that point */ |
| 517 | sbi = NULL; |
| 518 | s->s_op = &ecryptfs_sops; |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 519 | s->s_d_op = &ecryptfs_dops; |
| 520 | |
| 521 | err = "Reading sb failed"; |
| 522 | rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); |
| 523 | if (rc) { |
| 524 | ecryptfs_printk(KERN_WARNING, "kern_path() failed\n"); |
| 525 | goto out1; |
| 526 | } |
| 527 | if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) { |
| 528 | rc = -EINVAL; |
| 529 | printk(KERN_ERR "Mount on filesystem of type " |
| 530 | "eCryptfs explicitly disallowed due to " |
| 531 | "known incompatibilities\n"); |
| 532 | goto out_free; |
| 533 | } |
John Johansen | 7643554 | 2011-07-22 08:14:15 -0700 | [diff] [blame^] | 534 | |
| 535 | if (check_ruid && path.dentry->d_inode->i_uid != current_uid()) { |
| 536 | rc = -EPERM; |
| 537 | printk(KERN_ERR "Mount of device (uid: %d) not owned by " |
| 538 | "requested user (uid: %d)\n", |
| 539 | path.dentry->d_inode->i_uid, current_uid()); |
| 540 | goto out_free; |
| 541 | } |
| 542 | |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 543 | ecryptfs_set_superblock_lower(s, path.dentry->d_sb); |
| 544 | s->s_maxbytes = path.dentry->d_sb->s_maxbytes; |
| 545 | s->s_blocksize = path.dentry->d_sb->s_blocksize; |
Roberto Sassu | 070baa5 | 2010-11-03 11:11:22 +0100 | [diff] [blame] | 546 | s->s_magic = ECRYPTFS_SUPER_MAGIC; |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 547 | |
| 548 | inode = ecryptfs_get_inode(path.dentry->d_inode, s); |
| 549 | rc = PTR_ERR(inode); |
| 550 | if (IS_ERR(inode)) |
| 551 | goto out_free; |
| 552 | |
| 553 | s->s_root = d_alloc_root(inode); |
| 554 | if (!s->s_root) { |
| 555 | iput(inode); |
| 556 | rc = -ENOMEM; |
| 557 | goto out_free; |
| 558 | } |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 559 | |
| 560 | rc = -ENOMEM; |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 561 | root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 562 | if (!root_info) |
| 563 | goto out_free; |
| 564 | |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 565 | /* ->kill_sb() will take care of root_info */ |
| 566 | ecryptfs_set_dentry_private(s->s_root, root_info); |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 567 | ecryptfs_set_dentry_lower(s->s_root, path.dentry); |
| 568 | ecryptfs_set_dentry_lower_mnt(s->s_root, path.mnt); |
| 569 | |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 570 | s->s_flags |= MS_ACTIVE; |
Al Viro | 4d143be | 2010-07-26 13:33:36 +0400 | [diff] [blame] | 571 | return dget(s->s_root); |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 572 | |
Al Viro | 66cb766 | 2011-01-12 20:04:37 -0500 | [diff] [blame] | 573 | out_free: |
| 574 | path_put(&path); |
| 575 | out1: |
| 576 | deactivate_locked_super(s); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 577 | out: |
Al Viro | 2ccde7c | 2010-03-21 12:24:29 -0400 | [diff] [blame] | 578 | if (sbi) { |
| 579 | ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat); |
| 580 | kmem_cache_free(ecryptfs_sb_info_cache, sbi); |
| 581 | } |
| 582 | printk(KERN_ERR "%s; rc = [%d]\n", err, rc); |
Al Viro | 4d143be | 2010-07-26 13:33:36 +0400 | [diff] [blame] | 583 | return ERR_PTR(rc); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | /** |
| 587 | * ecryptfs_kill_block_super |
| 588 | * @sb: The ecryptfs super block |
| 589 | * |
| 590 | * Used to bring the superblock down and free the private data. |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 591 | */ |
| 592 | static void ecryptfs_kill_block_super(struct super_block *sb) |
| 593 | { |
Al Viro | decabd6 | 2010-03-20 22:32:26 -0400 | [diff] [blame] | 594 | struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb); |
| 595 | kill_anon_super(sb); |
| 596 | if (!sb_info) |
| 597 | return; |
| 598 | ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat); |
| 599 | bdi_destroy(&sb_info->bdi); |
| 600 | kmem_cache_free(ecryptfs_sb_info_cache, sb_info); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 601 | } |
| 602 | |
| 603 | static struct file_system_type ecryptfs_fs_type = { |
| 604 | .owner = THIS_MODULE, |
| 605 | .name = "ecryptfs", |
Al Viro | 4d143be | 2010-07-26 13:33:36 +0400 | [diff] [blame] | 606 | .mount = ecryptfs_mount, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 607 | .kill_sb = ecryptfs_kill_block_super, |
| 608 | .fs_flags = 0 |
| 609 | }; |
| 610 | |
| 611 | /** |
| 612 | * inode_info_init_once |
| 613 | * |
| 614 | * Initializes the ecryptfs_inode_info_cache when it is created |
| 615 | */ |
| 616 | static void |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 617 | inode_info_init_once(void *vptr) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 618 | { |
| 619 | struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr; |
| 620 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 621 | inode_init_once(&ei->vfs_inode); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | static struct ecryptfs_cache_info { |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 625 | struct kmem_cache **cache; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 626 | const char *name; |
| 627 | size_t size; |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 628 | void (*ctor)(void *obj); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 629 | } ecryptfs_cache_infos[] = { |
| 630 | { |
| 631 | .cache = &ecryptfs_auth_tok_list_item_cache, |
| 632 | .name = "ecryptfs_auth_tok_list_item", |
| 633 | .size = sizeof(struct ecryptfs_auth_tok_list_item), |
| 634 | }, |
| 635 | { |
| 636 | .cache = &ecryptfs_file_info_cache, |
| 637 | .name = "ecryptfs_file_cache", |
| 638 | .size = sizeof(struct ecryptfs_file_info), |
| 639 | }, |
| 640 | { |
| 641 | .cache = &ecryptfs_dentry_info_cache, |
| 642 | .name = "ecryptfs_dentry_info_cache", |
| 643 | .size = sizeof(struct ecryptfs_dentry_info), |
| 644 | }, |
| 645 | { |
| 646 | .cache = &ecryptfs_inode_info_cache, |
| 647 | .name = "ecryptfs_inode_cache", |
| 648 | .size = sizeof(struct ecryptfs_inode_info), |
| 649 | .ctor = inode_info_init_once, |
| 650 | }, |
| 651 | { |
| 652 | .cache = &ecryptfs_sb_info_cache, |
| 653 | .name = "ecryptfs_sb_cache", |
| 654 | .size = sizeof(struct ecryptfs_sb_info), |
| 655 | }, |
| 656 | { |
Tyler Hicks | 3063287 | 2011-05-24 05:11:12 -0500 | [diff] [blame] | 657 | .cache = &ecryptfs_header_cache, |
| 658 | .name = "ecryptfs_headers", |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 659 | .size = PAGE_CACHE_SIZE, |
| 660 | }, |
| 661 | { |
Michael Halcrow | dd2a3b7 | 2007-02-12 00:53:46 -0800 | [diff] [blame] | 662 | .cache = &ecryptfs_xattr_cache, |
| 663 | .name = "ecryptfs_xattr_cache", |
| 664 | .size = PAGE_CACHE_SIZE, |
| 665 | }, |
| 666 | { |
Michael Halcrow | eb95e7f | 2007-02-16 01:28:40 -0800 | [diff] [blame] | 667 | .cache = &ecryptfs_key_record_cache, |
| 668 | .name = "ecryptfs_key_record_cache", |
| 669 | .size = sizeof(struct ecryptfs_key_record), |
| 670 | }, |
Michael Halcrow | 956159c | 2007-10-16 01:27:55 -0700 | [diff] [blame] | 671 | { |
| 672 | .cache = &ecryptfs_key_sig_cache, |
| 673 | .name = "ecryptfs_key_sig_cache", |
| 674 | .size = sizeof(struct ecryptfs_key_sig), |
| 675 | }, |
| 676 | { |
| 677 | .cache = &ecryptfs_global_auth_tok_cache, |
| 678 | .name = "ecryptfs_global_auth_tok_cache", |
| 679 | .size = sizeof(struct ecryptfs_global_auth_tok), |
| 680 | }, |
| 681 | { |
| 682 | .cache = &ecryptfs_key_tfm_cache, |
| 683 | .name = "ecryptfs_key_tfm_cache", |
| 684 | .size = sizeof(struct ecryptfs_key_tfm), |
| 685 | }, |
Michael Halcrow | 746f1e5 | 2008-07-23 21:30:02 -0700 | [diff] [blame] | 686 | { |
| 687 | .cache = &ecryptfs_open_req_cache, |
| 688 | .name = "ecryptfs_open_req_cache", |
| 689 | .size = sizeof(struct ecryptfs_open_req), |
| 690 | }, |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 691 | }; |
| 692 | |
| 693 | static void ecryptfs_free_kmem_caches(void) |
| 694 | { |
| 695 | int i; |
| 696 | |
| 697 | for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { |
| 698 | struct ecryptfs_cache_info *info; |
| 699 | |
| 700 | info = &ecryptfs_cache_infos[i]; |
| 701 | if (*(info->cache)) |
| 702 | kmem_cache_destroy(*(info->cache)); |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | /** |
| 707 | * ecryptfs_init_kmem_caches |
| 708 | * |
| 709 | * Returns zero on success; non-zero otherwise |
| 710 | */ |
| 711 | static int ecryptfs_init_kmem_caches(void) |
| 712 | { |
| 713 | int i; |
| 714 | |
| 715 | for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) { |
| 716 | struct ecryptfs_cache_info *info; |
| 717 | |
| 718 | info = &ecryptfs_cache_infos[i]; |
| 719 | *(info->cache) = kmem_cache_create(info->name, info->size, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 720 | 0, SLAB_HWCACHE_ALIGN, info->ctor); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 721 | if (!*(info->cache)) { |
| 722 | ecryptfs_free_kmem_caches(); |
| 723 | ecryptfs_printk(KERN_WARNING, "%s: " |
| 724 | "kmem_cache_create failed\n", |
| 725 | info->name); |
| 726 | return -ENOMEM; |
| 727 | } |
| 728 | } |
| 729 | return 0; |
| 730 | } |
| 731 | |
Greg Kroah-Hartman | 6e90aa9 | 2007-11-06 15:08:08 -0800 | [diff] [blame] | 732 | static struct kobject *ecryptfs_kobj; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 733 | |
Kay Sievers | 386f275 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 734 | static ssize_t version_show(struct kobject *kobj, |
| 735 | struct kobj_attribute *attr, char *buff) |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 736 | { |
| 737 | return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK); |
| 738 | } |
| 739 | |
Kay Sievers | 386f275 | 2007-11-02 13:47:53 +0100 | [diff] [blame] | 740 | static struct kobj_attribute version_attr = __ATTR_RO(version); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 741 | |
Greg Kroah-Hartman | 30a468b | 2007-10-15 15:01:24 -0700 | [diff] [blame] | 742 | static struct attribute *attributes[] = { |
| 743 | &version_attr.attr, |
Greg Kroah-Hartman | 30a468b | 2007-10-15 15:01:24 -0700 | [diff] [blame] | 744 | NULL, |
| 745 | }; |
| 746 | |
| 747 | static struct attribute_group attr_group = { |
| 748 | .attrs = attributes, |
| 749 | }; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 750 | |
| 751 | static int do_sysfs_registration(void) |
| 752 | { |
| 753 | int rc; |
| 754 | |
Greg Kroah-Hartman | 6e90aa9 | 2007-11-06 15:08:08 -0800 | [diff] [blame] | 755 | ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj); |
| 756 | if (!ecryptfs_kobj) { |
Greg Kroah-Hartman | 917e865 | 2007-10-29 20:13:17 +0100 | [diff] [blame] | 757 | printk(KERN_ERR "Unable to create ecryptfs kset\n"); |
| 758 | rc = -ENOMEM; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 759 | goto out; |
| 760 | } |
Greg Kroah-Hartman | 6e90aa9 | 2007-11-06 15:08:08 -0800 | [diff] [blame] | 761 | rc = sysfs_create_group(ecryptfs_kobj, &attr_group); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 762 | if (rc) { |
| 763 | printk(KERN_ERR |
Greg Kroah-Hartman | 30a468b | 2007-10-15 15:01:24 -0700 | [diff] [blame] | 764 | "Unable to create ecryptfs version attributes\n"); |
Greg Kroah-Hartman | 197b12d | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 765 | kobject_put(ecryptfs_kobj); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 766 | } |
| 767 | out: |
| 768 | return rc; |
| 769 | } |
| 770 | |
Ryusuke Konishi | a75de1b | 2007-08-10 13:00:56 -0700 | [diff] [blame] | 771 | static void do_sysfs_unregistration(void) |
| 772 | { |
Greg Kroah-Hartman | 6e90aa9 | 2007-11-06 15:08:08 -0800 | [diff] [blame] | 773 | sysfs_remove_group(ecryptfs_kobj, &attr_group); |
Greg Kroah-Hartman | 197b12d | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 774 | kobject_put(ecryptfs_kobj); |
Ryusuke Konishi | a75de1b | 2007-08-10 13:00:56 -0700 | [diff] [blame] | 775 | } |
| 776 | |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 777 | static int __init ecryptfs_init(void) |
| 778 | { |
| 779 | int rc; |
| 780 | |
| 781 | if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) { |
| 782 | rc = -EINVAL; |
| 783 | ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is " |
| 784 | "larger than the host's page size, and so " |
| 785 | "eCryptfs cannot run on this system. The " |
Joe Perches | 888d57b | 2010-11-10 15:46:16 -0800 | [diff] [blame] | 786 | "default eCryptfs extent size is [%u] bytes; " |
| 787 | "the page size is [%lu] bytes.\n", |
| 788 | ECRYPTFS_DEFAULT_EXTENT_SIZE, |
| 789 | (unsigned long)PAGE_CACHE_SIZE); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 790 | goto out; |
| 791 | } |
| 792 | rc = ecryptfs_init_kmem_caches(); |
| 793 | if (rc) { |
| 794 | printk(KERN_ERR |
| 795 | "Failed to allocate one or more kmem_cache objects\n"); |
| 796 | goto out; |
| 797 | } |
| 798 | rc = register_filesystem(&ecryptfs_fs_type); |
| 799 | if (rc) { |
| 800 | printk(KERN_ERR "Failed to register filesystem\n"); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 801 | goto out_free_kmem_caches; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 802 | } |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 803 | rc = do_sysfs_registration(); |
| 804 | if (rc) { |
| 805 | printk(KERN_ERR "sysfs registration failed\n"); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 806 | goto out_unregister_filesystem; |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 807 | } |
Michael Halcrow | 746f1e5 | 2008-07-23 21:30:02 -0700 | [diff] [blame] | 808 | rc = ecryptfs_init_kthread(); |
| 809 | if (rc) { |
| 810 | printk(KERN_ERR "%s: kthread initialization failed; " |
| 811 | "rc = [%d]\n", __func__, rc); |
| 812 | goto out_do_sysfs_unregistration; |
| 813 | } |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 814 | rc = ecryptfs_init_messaging(); |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 815 | if (rc) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 816 | printk(KERN_ERR "Failure occurred while attempting to " |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 817 | "initialize the communications channel to " |
| 818 | "ecryptfsd\n"); |
Michael Halcrow | 746f1e5 | 2008-07-23 21:30:02 -0700 | [diff] [blame] | 819 | goto out_destroy_kthread; |
Michael Halcrow | 956159c | 2007-10-16 01:27:55 -0700 | [diff] [blame] | 820 | } |
| 821 | rc = ecryptfs_init_crypto(); |
| 822 | if (rc) { |
| 823 | printk(KERN_ERR "Failure whilst attempting to init crypto; " |
| 824 | "rc = [%d]\n", rc); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 825 | goto out_release_messaging; |
Michael Halcrow | dddfa46 | 2007-02-12 00:53:44 -0800 | [diff] [blame] | 826 | } |
Eric Sandeen | 2830bfd | 2008-02-06 01:38:34 -0800 | [diff] [blame] | 827 | if (ecryptfs_verbosity > 0) |
| 828 | printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values " |
| 829 | "will be written to the syslog!\n", ecryptfs_verbosity); |
| 830 | |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 831 | goto out; |
| 832 | out_release_messaging: |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 833 | ecryptfs_release_messaging(); |
Michael Halcrow | 746f1e5 | 2008-07-23 21:30:02 -0700 | [diff] [blame] | 834 | out_destroy_kthread: |
| 835 | ecryptfs_destroy_kthread(); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 836 | out_do_sysfs_unregistration: |
| 837 | do_sysfs_unregistration(); |
| 838 | out_unregister_filesystem: |
| 839 | unregister_filesystem(&ecryptfs_fs_type); |
| 840 | out_free_kmem_caches: |
| 841 | ecryptfs_free_kmem_caches(); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 842 | out: |
| 843 | return rc; |
| 844 | } |
| 845 | |
| 846 | static void __exit ecryptfs_exit(void) |
| 847 | { |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 848 | int rc; |
| 849 | |
| 850 | rc = ecryptfs_destroy_crypto(); |
| 851 | if (rc) |
| 852 | printk(KERN_ERR "Failure whilst attempting to destroy crypto; " |
| 853 | "rc = [%d]\n", rc); |
Tyler Hicks | 624ae52 | 2008-10-15 22:02:51 -0700 | [diff] [blame] | 854 | ecryptfs_release_messaging(); |
Michael Halcrow | 746f1e5 | 2008-07-23 21:30:02 -0700 | [diff] [blame] | 855 | ecryptfs_destroy_kthread(); |
Michael Halcrow | cf81f89 | 2007-10-16 01:28:07 -0700 | [diff] [blame] | 856 | do_sysfs_unregistration(); |
Michael Halcrow | 237fead | 2006-10-04 02:16:22 -0700 | [diff] [blame] | 857 | unregister_filesystem(&ecryptfs_fs_type); |
| 858 | ecryptfs_free_kmem_caches(); |
| 859 | } |
| 860 | |
| 861 | MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>"); |
| 862 | MODULE_DESCRIPTION("eCryptfs"); |
| 863 | |
| 864 | MODULE_LICENSE("GPL"); |
| 865 | |
| 866 | module_init(ecryptfs_init) |
| 867 | module_exit(ecryptfs_exit) |