#include <linux/namei.h>
#include <linux/skbuff.h>
#include <linux/crypto.h>
-#include <linux/netlink.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/key.h>
#include <linux/parser.h>
#include <linux/fs_stack.h>
+#include <linux/slab.h>
#include "ecryptfs_kernel.h"
/**
"0, which is Quiet)");
/**
- * Module parameter that defines the number of netlink message buffer
- * elements
+ * Module parameter that defines the number of message buffer elements
*/
unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
/**
* Module parameter that defines the maximum guaranteed amount of time to wait
- * for a response through netlink. The actual sleep time will be, more than
+ * for a response from ecryptfsd. The actual sleep time will be, more than
* likely, a small amount greater than this specified value, but only less if
- * the netlink message successfully arrives.
+ * the message successfully arrives.
*/
signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
"concurrent users of eCryptfs");
-unsigned int ecryptfs_transport = ECRYPTFS_DEFAULT_TRANSPORT;
-
void __ecryptfs_printk(const char *fmt, ...)
{
va_list args;
*
* Returns zero on success; non-zero otherwise
*/
-static int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
+int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
{
+ const struct cred *cred = current_cred();
struct ecryptfs_inode_info *inode_info =
ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);
int rc = 0;
ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry);
lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
- /* Corresponding dput() and mntput() are done when the
- * persistent file is fput() when the eCryptfs inode
- * is destroyed. */
- dget(lower_dentry);
- mntget(lower_mnt);
- inode_info->lower_file = dentry_open(lower_dentry,
- lower_mnt,
- (O_RDWR | O_LARGEFILE));
- if (IS_ERR(inode_info->lower_file)) {
- dget(lower_dentry);
- mntget(lower_mnt);
- inode_info->lower_file = dentry_open(lower_dentry,
- lower_mnt,
- (O_RDONLY
- | O_LARGEFILE));
- }
- if (IS_ERR(inode_info->lower_file)) {
+ rc = ecryptfs_privileged_open(&inode_info->lower_file,
+ lower_dentry, lower_mnt, cred);
+ if (rc) {
printk(KERN_ERR "Error opening lower persistent file "
- "for lower_dentry [0x%p] and lower_mnt [0x%p]\n",
- lower_dentry, lower_mnt);
- rc = PTR_ERR(inode_info->lower_file);
+ "for lower_dentry [0x%p] and lower_mnt [0x%p]; "
+ "rc = [%d]\n", lower_dentry, lower_mnt, rc);
inode_info->lower_file = NULL;
}
}
* @lower_dentry: Existing dentry in the lower filesystem
* @dentry: ecryptfs' dentry
* @sb: ecryptfs's super_block
- * @flag: If set to true, then d_add is called, else d_instantiate is called
+ * @flags: flags to govern behavior of interpose procedure
*
* Interposes upper and lower dentries.
*
* Returns zero on success; non-zero otherwise
*/
int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
- struct super_block *sb, int flag)
+ struct super_block *sb, u32 flags)
{
struct inode *lower_inode;
struct inode *inode;
init_special_inode(inode, lower_inode->i_mode,
lower_inode->i_rdev);
dentry->d_op = &ecryptfs_dops;
- if (flag)
- d_add(dentry, inode);
- else
- d_instantiate(dentry, inode);
- fsstack_copy_attr_all(inode, lower_inode, NULL);
+ fsstack_copy_attr_all(inode, lower_inode);
/* This size will be overwritten for real files w/ headers and
* other metadata */
fsstack_copy_inode_size(inode, lower_inode);
- rc = ecryptfs_init_persistent_file(dentry);
- if (rc) {
- printk(KERN_ERR "%s: Error attempting to initialize the "
- "persistent file for the dentry with name [%s]; "
- "rc = [%d]\n", __FUNCTION__, dentry->d_name.name, rc);
- goto out;
- }
+ if (flags & ECRYPTFS_INTERPOSE_FLAG_D_ADD)
+ d_add(dentry, inode);
+ else
+ d_instantiate(dentry, inode);
out:
return rc;
}
-enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig, ecryptfs_opt_debug,
- ecryptfs_opt_ecryptfs_debug, ecryptfs_opt_cipher,
- ecryptfs_opt_ecryptfs_cipher, ecryptfs_opt_ecryptfs_key_bytes,
+enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
+ ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher,
+ ecryptfs_opt_ecryptfs_key_bytes,
ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
- ecryptfs_opt_encrypted_view, ecryptfs_opt_err };
+ ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
+ ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
+ ecryptfs_opt_unlink_sigs, ecryptfs_opt_err };
-static match_table_t tokens = {
+static const match_table_t tokens = {
{ecryptfs_opt_sig, "sig=%s"},
{ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
- {ecryptfs_opt_debug, "debug=%u"},
- {ecryptfs_opt_ecryptfs_debug, "ecryptfs_debug=%u"},
{ecryptfs_opt_cipher, "cipher=%s"},
{ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"},
{ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"},
{ecryptfs_opt_passthrough, "ecryptfs_passthrough"},
{ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"},
{ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"},
+ {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"},
+ {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
+ {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
+ {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
{ecryptfs_opt_err, NULL}
};
"session keyring for sig specified in mount "
"option: [%s]\n", global_auth_tok->sig);
global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
- rc = 0;
+ goto out;
} else
global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
}
+out:
return rc;
}
int rc = 0;
int sig_set = 0;
int cipher_name_set = 0;
+ int fn_cipher_name_set = 0;
int cipher_key_bytes;
int cipher_key_bytes_set = 0;
+ int fn_cipher_key_bytes;
+ int fn_cipher_key_bytes_set = 0;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
&ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
substring_t args[MAX_OPT_ARGS];
int token;
char *sig_src;
- char *debug_src;
char *cipher_name_dst;
char *cipher_name_src;
+ char *fn_cipher_name_dst;
+ char *fn_cipher_name_src;
+ char *fnek_dst;
+ char *fnek_src;
char *cipher_key_bytes_src;
- int cipher_name_len;
+ char *fn_cipher_key_bytes_src;
if (!options) {
rc = -EINVAL;
case ecryptfs_opt_ecryptfs_sig:
sig_src = args[0].from;
rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
- sig_src);
+ sig_src, 0);
if (rc) {
printk(KERN_ERR "Error attempting to register "
"global sig; rc = [%d]\n", rc);
}
sig_set = 1;
break;
- case ecryptfs_opt_debug:
- case ecryptfs_opt_ecryptfs_debug:
- debug_src = args[0].from;
- ecryptfs_verbosity =
- (int)simple_strtol(debug_src, &debug_src,
- 0);
- ecryptfs_printk(KERN_DEBUG,
- "Verbosity set to [%d]" "\n",
- ecryptfs_verbosity);
- break;
case ecryptfs_opt_cipher:
case ecryptfs_opt_ecryptfs_cipher:
cipher_name_src = args[0].from;
global_default_cipher_name;
strncpy(cipher_name_dst, cipher_name_src,
ECRYPTFS_MAX_CIPHER_NAME_SIZE);
- ecryptfs_printk(KERN_DEBUG,
- "The mount_crypt_stat "
- "global_default_cipher_name set to: "
- "[%s]\n", cipher_name_dst);
+ cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
cipher_name_set = 1;
break;
case ecryptfs_opt_ecryptfs_key_bytes:
&cipher_key_bytes_src, 0);
mount_crypt_stat->global_default_cipher_key_size =
cipher_key_bytes;
- ecryptfs_printk(KERN_DEBUG,
- "The mount_crypt_stat "
- "global_default_cipher_key_size "
- "set to: [%d]\n", mount_crypt_stat->
- global_default_cipher_key_size);
cipher_key_bytes_set = 1;
break;
case ecryptfs_opt_passthrough:
mount_crypt_stat->flags |=
ECRYPTFS_ENCRYPTED_VIEW_ENABLED;
break;
+ case ecryptfs_opt_fnek_sig:
+ fnek_src = args[0].from;
+ fnek_dst =
+ mount_crypt_stat->global_default_fnek_sig;
+ strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX);
+ mount_crypt_stat->global_default_fnek_sig[
+ ECRYPTFS_SIG_SIZE_HEX] = '\0';
+ rc = ecryptfs_add_global_auth_tok(
+ mount_crypt_stat,
+ mount_crypt_stat->global_default_fnek_sig,
+ ECRYPTFS_AUTH_TOK_FNEK);
+ if (rc) {
+ printk(KERN_ERR "Error attempting to register "
+ "global fnek sig [%s]; rc = [%d]\n",
+ mount_crypt_stat->global_default_fnek_sig,
+ rc);
+ goto out;
+ }
+ mount_crypt_stat->flags |=
+ (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES
+ | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK);
+ break;
+ case ecryptfs_opt_fn_cipher:
+ fn_cipher_name_src = args[0].from;
+ fn_cipher_name_dst =
+ mount_crypt_stat->global_default_fn_cipher_name;
+ strncpy(fn_cipher_name_dst, fn_cipher_name_src,
+ ECRYPTFS_MAX_CIPHER_NAME_SIZE);
+ mount_crypt_stat->global_default_fn_cipher_name[
+ ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
+ fn_cipher_name_set = 1;
+ break;
+ case ecryptfs_opt_fn_cipher_key_bytes:
+ fn_cipher_key_bytes_src = args[0].from;
+ fn_cipher_key_bytes =
+ (int)simple_strtol(fn_cipher_key_bytes_src,
+ &fn_cipher_key_bytes_src, 0);
+ mount_crypt_stat->global_default_fn_cipher_key_bytes =
+ fn_cipher_key_bytes;
+ fn_cipher_key_bytes_set = 1;
+ break;
+ case ecryptfs_opt_unlink_sigs:
+ mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
+ break;
case ecryptfs_opt_err:
default:
- ecryptfs_printk(KERN_WARNING,
- "eCryptfs: unrecognized option '%s'\n",
- p);
+ printk(KERN_WARNING
+ "%s: eCryptfs: unrecognized option [%s]\n",
+ __func__, p);
}
}
if (!sig_set) {
goto out;
}
if (!cipher_name_set) {
- cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
- if (unlikely(cipher_name_len
- >= ECRYPTFS_MAX_CIPHER_NAME_SIZE)) {
+ int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
+
+ BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE);
+ strcpy(mount_crypt_stat->global_default_cipher_name,
+ ECRYPTFS_DEFAULT_CIPHER);
+ }
+ if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
+ && !fn_cipher_name_set)
+ strcpy(mount_crypt_stat->global_default_fn_cipher_name,
+ mount_crypt_stat->global_default_cipher_name);
+ if (!cipher_key_bytes_set)
+ mount_crypt_stat->global_default_cipher_key_size = 0;
+ if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
+ && !fn_cipher_key_bytes_set)
+ mount_crypt_stat->global_default_fn_cipher_key_bytes =
+ mount_crypt_stat->global_default_cipher_key_size;
+ mutex_lock(&key_tfm_list_mutex);
+ if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
+ NULL)) {
+ rc = ecryptfs_add_new_key_tfm(
+ NULL, mount_crypt_stat->global_default_cipher_name,
+ mount_crypt_stat->global_default_cipher_key_size);
+ if (rc) {
+ printk(KERN_ERR "Error attempting to initialize "
+ "cipher with name = [%s] and key size = [%td]; "
+ "rc = [%d]\n",
+ mount_crypt_stat->global_default_cipher_name,
+ mount_crypt_stat->global_default_cipher_key_size,
+ rc);
rc = -EINVAL;
- BUG();
+ mutex_unlock(&key_tfm_list_mutex);
goto out;
}
- memcpy(mount_crypt_stat->global_default_cipher_name,
- ECRYPTFS_DEFAULT_CIPHER, cipher_name_len);
- mount_crypt_stat->global_default_cipher_name[cipher_name_len]
- = '\0';
}
- if (!cipher_key_bytes_set) {
- mount_crypt_stat->global_default_cipher_key_size = 0;
- }
- rc = ecryptfs_add_new_key_tfm(
- NULL, mount_crypt_stat->global_default_cipher_name,
- mount_crypt_stat->global_default_cipher_key_size);
- if (rc) {
- printk(KERN_ERR "Error attempting to initialize cipher with "
- "name = [%s] and key size = [%td]; rc = [%d]\n",
- mount_crypt_stat->global_default_cipher_name,
- mount_crypt_stat->global_default_cipher_key_size, rc);
- rc = -EINVAL;
- goto out;
+ if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
+ && !ecryptfs_tfm_exists(
+ mount_crypt_stat->global_default_fn_cipher_name, NULL)) {
+ rc = ecryptfs_add_new_key_tfm(
+ NULL, mount_crypt_stat->global_default_fn_cipher_name,
+ mount_crypt_stat->global_default_fn_cipher_key_bytes);
+ if (rc) {
+ printk(KERN_ERR "Error attempting to initialize "
+ "cipher with name = [%s] and key size = [%td]; "
+ "rc = [%d]\n",
+ mount_crypt_stat->global_default_fn_cipher_name,
+ mount_crypt_stat->global_default_fn_cipher_key_bytes,
+ rc);
+ rc = -EINVAL;
+ mutex_unlock(&key_tfm_list_mutex);
+ goto out;
+ }
}
+ mutex_unlock(&key_tfm_list_mutex);
rc = ecryptfs_init_global_auth_toks(mount_crypt_stat);
- if (rc) {
+ if (rc)
printk(KERN_WARNING "One or more global auth toks could not "
"properly register; rc = [%d]\n", rc);
- }
- rc = 0;
out:
return rc;
}
static int
ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
{
+ struct ecryptfs_sb_info *esi;
int rc = 0;
/* Released in ecryptfs_put_super() */
ecryptfs_set_superblock_private(sb,
kmem_cache_zalloc(ecryptfs_sb_info_cache,
GFP_KERNEL));
- if (!ecryptfs_superblock_to_private(sb)) {
+ esi = ecryptfs_superblock_to_private(sb);
+ if (!esi) {
ecryptfs_printk(KERN_WARNING, "Out of memory\n");
rc = -ENOMEM;
goto out;
}
+
+ rc = bdi_setup_and_register(&esi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
+ if (rc)
+ goto out;
+
+ sb->s_bdi = &esi->bdi;
sb->s_op = &ecryptfs_sops;
/* Released through deactivate_super(sb) from get_sb_nodev */
sb->s_root = d_alloc(NULL, &(const struct qstr) {
*/
static int ecryptfs_read_super(struct super_block *sb, const char *dev_name)
{
+ struct path path;
int rc;
- struct nameidata nd;
- struct dentry *lower_root;
- struct vfsmount *lower_mnt;
- memset(&nd, 0, sizeof(struct nameidata));
- rc = path_lookup(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd);
+ rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
if (rc) {
ecryptfs_printk(KERN_WARNING, "path_lookup() failed\n");
goto out;
}
- lower_root = nd.dentry;
- lower_mnt = nd.mnt;
- ecryptfs_set_superblock_lower(sb, lower_root->d_sb);
- sb->s_maxbytes = lower_root->d_sb->s_maxbytes;
- sb->s_blocksize = lower_root->d_sb->s_blocksize;
- ecryptfs_set_dentry_lower(sb->s_root, lower_root);
- ecryptfs_set_dentry_lower_mnt(sb->s_root, lower_mnt);
- rc = ecryptfs_interpose(lower_root, sb->s_root, sb, 0);
+ ecryptfs_set_superblock_lower(sb, path.dentry->d_sb);
+ sb->s_maxbytes = path.dentry->d_sb->s_maxbytes;
+ sb->s_blocksize = path.dentry->d_sb->s_blocksize;
+ ecryptfs_set_dentry_lower(sb->s_root, path.dentry);
+ ecryptfs_set_dentry_lower_mnt(sb->s_root, path.mnt);
+ rc = ecryptfs_interpose(path.dentry, sb->s_root, sb, 0);
if (rc)
goto out_free;
rc = 0;
goto out;
out_free:
- path_release(&nd);
+ path_put(&path);
out:
return rc;
}
* with as much information as it can before needing
* the lower filesystem.
* ecryptfs_read_super(): this accesses the lower filesystem and uses
- * ecryptfs_interpolate to perform most of the linking
- * ecryptfs_interpolate(): links the lower filesystem into ecryptfs
+ * ecryptfs_interpose to perform most of the linking
+ * ecryptfs_interpose(): links the lower filesystem into ecryptfs (inode.c)
*/
static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data,
}
goto out;
out_abort:
- dput(sb->s_root);
- up_write(&sb->s_umount);
- deactivate_super(sb);
+ dput(sb->s_root); /* aka mnt->mnt_root, as set by get_sb_nodev() */
+ deactivate_locked_super(sb);
out:
return rc;
}
* Initializes the ecryptfs_inode_info_cache when it is created
*/
static void
-inode_info_init_once(struct kmem_cache *cachep, void *vptr)
+inode_info_init_once(void *vptr)
{
struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
struct kmem_cache **cache;
const char *name;
size_t size;
- void (*ctor)(struct kmem_cache *cache, void *obj);
+ void (*ctor)(void *obj);
} ecryptfs_cache_infos[] = {
{
.cache = &ecryptfs_auth_tok_list_item_cache,
.name = "ecryptfs_key_tfm_cache",
.size = sizeof(struct ecryptfs_key_tfm),
},
+ {
+ .cache = &ecryptfs_open_req_cache,
+ .name = "ecryptfs_open_req_cache",
+ .size = sizeof(struct ecryptfs_open_req),
+ },
};
static void ecryptfs_free_kmem_caches(void)
printk(KERN_ERR "sysfs registration failed\n");
goto out_unregister_filesystem;
}
- rc = ecryptfs_init_messaging(ecryptfs_transport);
+ rc = ecryptfs_init_kthread();
if (rc) {
- ecryptfs_printk(KERN_ERR, "Failure occured while attempting to "
- "initialize the eCryptfs netlink socket\n");
+ printk(KERN_ERR "%s: kthread initialization failed; "
+ "rc = [%d]\n", __func__, rc);
goto out_do_sysfs_unregistration;
}
+ rc = ecryptfs_init_messaging();
+ if (rc) {
+ printk(KERN_ERR "Failure occured while attempting to "
+ "initialize the communications channel to "
+ "ecryptfsd\n");
+ goto out_destroy_kthread;
+ }
rc = ecryptfs_init_crypto();
if (rc) {
printk(KERN_ERR "Failure whilst attempting to init crypto; "
"rc = [%d]\n", rc);
goto out_release_messaging;
}
+ if (ecryptfs_verbosity > 0)
+ printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values "
+ "will be written to the syslog!\n", ecryptfs_verbosity);
+
goto out;
out_release_messaging:
- ecryptfs_release_messaging(ecryptfs_transport);
+ ecryptfs_release_messaging();
+out_destroy_kthread:
+ ecryptfs_destroy_kthread();
out_do_sysfs_unregistration:
do_sysfs_unregistration();
out_unregister_filesystem:
if (rc)
printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
"rc = [%d]\n", rc);
- ecryptfs_release_messaging(ecryptfs_transport);
+ ecryptfs_release_messaging();
+ ecryptfs_destroy_kthread();
do_sysfs_unregistration();
unregister_filesystem(&ecryptfs_fs_type);
ecryptfs_free_kmem_caches();
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff