diff options
Diffstat (limited to 'fs/ecryptfs')
-rw-r--r-- | fs/ecryptfs/Kconfig | 11 | ||||
-rw-r--r-- | fs/ecryptfs/crypto.c | 55 | ||||
-rw-r--r-- | fs/ecryptfs/ecryptfs_kernel.h | 4 | ||||
-rw-r--r-- | fs/ecryptfs/inode.c | 32 | ||||
-rw-r--r-- | fs/ecryptfs/keystore.c | 3 | ||||
-rw-r--r-- | fs/ecryptfs/main.c | 5 |
6 files changed, 66 insertions, 44 deletions
diff --git a/fs/ecryptfs/Kconfig b/fs/ecryptfs/Kconfig new file mode 100644 index 000000000000..0c754e64232b --- /dev/null +++ b/fs/ecryptfs/Kconfig @@ -0,0 +1,11 @@ +config ECRYPT_FS + tristate "eCrypt filesystem layer support (EXPERIMENTAL)" + depends on EXPERIMENTAL && KEYS && CRYPTO && NET + help + Encrypted filesystem that operates on the VFS layer. See + <file:Documentation/filesystems/ecryptfs.txt> to learn more about + eCryptfs. Userspace components are required and can be + obtained from <http://ecryptfs.sf.net>. + + To compile this file system support as a module, choose M here: the + module will be called ecryptfs. diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index c01e043670e2..8b65f289ee00 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -946,6 +946,8 @@ static int ecryptfs_copy_mount_wide_sigs_to_inode_sigs( list_for_each_entry(global_auth_tok, &mount_crypt_stat->global_auth_tok_list, mount_crypt_stat_list) { + if (global_auth_tok->flags & ECRYPTFS_AUTH_TOK_FNEK) + continue; rc = ecryptfs_add_keysig(crypt_stat, global_auth_tok->sig); if (rc) { printk(KERN_ERR "Error adding keysig; rc = [%d]\n", rc); @@ -1322,14 +1324,13 @@ static int ecryptfs_write_headers_virt(char *page_virt, size_t max, } static int -ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt_stat, - struct dentry *ecryptfs_dentry, - char *virt) +ecryptfs_write_metadata_to_contents(struct dentry *ecryptfs_dentry, + char *virt, size_t virt_len) { int rc; rc = ecryptfs_write_lower(ecryptfs_dentry->d_inode, virt, - 0, crypt_stat->num_header_bytes_at_front); + 0, virt_len); if (rc) printk(KERN_ERR "%s: Error attempting to write header " "information to lower file; rc = [%d]\n", __func__, @@ -1339,7 +1340,6 @@ ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt_stat, static int ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry, - struct ecryptfs_crypt_stat *crypt_stat, char *page_virt, size_t size) { int rc; @@ -1349,6 +1349,17 @@ ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry, return rc; } +static unsigned long ecryptfs_get_zeroed_pages(gfp_t gfp_mask, + unsigned int order) +{ + struct page *page; + + page = alloc_pages(gfp_mask | __GFP_ZERO, order); + if (page) + return (unsigned long) page_address(page); + return 0; +} + /** * ecryptfs_write_metadata * @ecryptfs_dentry: The eCryptfs dentry @@ -1365,7 +1376,9 @@ int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry) { struct ecryptfs_crypt_stat *crypt_stat = &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; + unsigned int order; char *virt; + size_t virt_len; size_t size = 0; int rc = 0; @@ -1381,33 +1394,35 @@ int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry) rc = -EINVAL; goto out; } + virt_len = crypt_stat->num_header_bytes_at_front; + order = get_order(virt_len); /* Released in this function */ - virt = (char *)get_zeroed_page(GFP_KERNEL); + virt = (char *)ecryptfs_get_zeroed_pages(GFP_KERNEL, order); if (!virt) { printk(KERN_ERR "%s: Out of memory\n", __func__); rc = -ENOMEM; goto out; } - rc = ecryptfs_write_headers_virt(virt, PAGE_CACHE_SIZE, &size, - crypt_stat, ecryptfs_dentry); + rc = ecryptfs_write_headers_virt(virt, virt_len, &size, crypt_stat, + ecryptfs_dentry); if (unlikely(rc)) { printk(KERN_ERR "%s: Error whilst writing headers; rc = [%d]\n", __func__, rc); goto out_free; } if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) - rc = ecryptfs_write_metadata_to_xattr(ecryptfs_dentry, - crypt_stat, virt, size); + rc = ecryptfs_write_metadata_to_xattr(ecryptfs_dentry, virt, + size); else - rc = ecryptfs_write_metadata_to_contents(crypt_stat, - ecryptfs_dentry, virt); + rc = ecryptfs_write_metadata_to_contents(ecryptfs_dentry, virt, + virt_len); if (rc) { printk(KERN_ERR "%s: Error writing metadata out to lower file; " "rc = [%d]\n", __func__, rc); goto out_free; } out_free: - free_page((unsigned long)virt); + free_pages((unsigned long)virt, order); out: return rc; } @@ -1716,7 +1731,7 @@ static int ecryptfs_copy_filename(char **copied_name, size_t *copied_name_size, { int rc = 0; - (*copied_name) = kmalloc((name_size + 2), GFP_KERNEL); + (*copied_name) = kmalloc((name_size + 1), GFP_KERNEL); if (!(*copied_name)) { rc = -ENOMEM; goto out; @@ -1726,7 +1741,7 @@ static int ecryptfs_copy_filename(char **copied_name, size_t *copied_name_size, * in printing out the * string in debug * messages */ - (*copied_name_size) = (name_size + 1); + (*copied_name_size) = name_size; out: return rc; } @@ -2206,17 +2221,19 @@ int ecryptfs_decode_and_decrypt_filename(char **plaintext_name, struct dentry *ecryptfs_dir_dentry, const char *name, size_t name_size) { + struct ecryptfs_mount_crypt_stat *mount_crypt_stat = + &ecryptfs_superblock_to_private( + ecryptfs_dir_dentry->d_sb)->mount_crypt_stat; char *decoded_name; size_t decoded_name_size; size_t packet_size; int rc = 0; - if ((name_size > ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE) + if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) + && !(mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) + && (name_size > ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE) && (strncmp(name, ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX, ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE) == 0)) { - struct ecryptfs_mount_crypt_stat *mount_crypt_stat = - &ecryptfs_superblock_to_private( - ecryptfs_dir_dentry->d_sb)->mount_crypt_stat; const char *orig_name = name; size_t orig_name_size = name_size; diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h index c11fc95714ab..ac749d4d644f 100644 --- a/fs/ecryptfs/ecryptfs_kernel.h +++ b/fs/ecryptfs/ecryptfs_kernel.h @@ -328,6 +328,7 @@ struct ecryptfs_dentry_info { */ struct ecryptfs_global_auth_tok { #define ECRYPTFS_AUTH_TOK_INVALID 0x00000001 +#define ECRYPTFS_AUTH_TOK_FNEK 0x00000002 u32 flags; struct list_head mount_crypt_stat_list; struct key *global_auth_tok_key; @@ -619,7 +620,6 @@ int ecryptfs_interpose(struct dentry *hidden_dentry, u32 flags); int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, struct dentry *lower_dentry, - struct ecryptfs_crypt_stat *crypt_stat, struct inode *ecryptfs_dir_inode, struct nameidata *ecryptfs_nd); int ecryptfs_decode_and_decrypt_filename(char **decrypted_name, @@ -696,7 +696,7 @@ ecryptfs_write_header_metadata(char *virt, int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig); int ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, - char *sig); + char *sig, u32 global_auth_tok_flags); int ecryptfs_get_global_auth_tok_for_sig( struct ecryptfs_global_auth_tok **global_auth_tok, struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig); diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 5697899a168d..55b3145b8072 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -246,7 +246,6 @@ out: */ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, struct dentry *lower_dentry, - struct ecryptfs_crypt_stat *crypt_stat, struct inode *ecryptfs_dir_inode, struct nameidata *ecryptfs_nd) { @@ -254,6 +253,7 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, struct vfsmount *lower_mnt; struct inode *lower_inode; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; + struct ecryptfs_crypt_stat *crypt_stat; char *page_virt = NULL; u64 file_size; int rc = 0; @@ -314,6 +314,11 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, goto out_free_kmem; } } + crypt_stat = &ecryptfs_inode_to_private( + ecryptfs_dentry->d_inode)->crypt_stat; + /* TODO: lock for crypt_stat comparison */ + if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) + ecryptfs_set_default_sizes(crypt_stat); rc = ecryptfs_read_and_validate_header_region(page_virt, ecryptfs_dentry->d_inode); if (rc) { @@ -362,9 +367,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, { char *encrypted_and_encoded_name = NULL; size_t encrypted_and_encoded_name_size; - struct ecryptfs_crypt_stat *crypt_stat = NULL; struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; - struct ecryptfs_inode_info *inode_info; struct dentry *lower_dir_dentry, *lower_dentry; int rc = 0; @@ -388,26 +391,15 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, } if (lower_dentry->d_inode) goto lookup_and_interpose; - inode_info = ecryptfs_inode_to_private(ecryptfs_dentry->d_inode); - if (inode_info) { - crypt_stat = &inode_info->crypt_stat; - /* TODO: lock for crypt_stat comparison */ - if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) - ecryptfs_set_default_sizes(crypt_stat); - } - if (crypt_stat) - mount_crypt_stat = crypt_stat->mount_crypt_stat; - else - mount_crypt_stat = &ecryptfs_superblock_to_private( - ecryptfs_dentry->d_sb)->mount_crypt_stat; - if (!(crypt_stat && (crypt_stat->flags & ECRYPTFS_ENCRYPT_FILENAMES)) - && !(mount_crypt_stat && (mount_crypt_stat->flags - & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) + mount_crypt_stat = &ecryptfs_superblock_to_private( + ecryptfs_dentry->d_sb)->mount_crypt_stat; + if (!(mount_crypt_stat + && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) goto lookup_and_interpose; dput(lower_dentry); rc = ecryptfs_encrypt_and_encode_filename( &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, - crypt_stat, mount_crypt_stat, ecryptfs_dentry->d_name.name, + NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, ecryptfs_dentry->d_name.len); if (rc) { printk(KERN_ERR "%s: Error attempting to encrypt and encode " @@ -426,7 +418,7 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, } lookup_and_interpose: rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, - crypt_stat, ecryptfs_dir_inode, + ecryptfs_dir_inode, ecryptfs_nd); goto out; out_d_drop: diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c index ff539420cc6f..e4a6223c3145 100644 --- a/fs/ecryptfs/keystore.c +++ b/fs/ecryptfs/keystore.c @@ -2375,7 +2375,7 @@ struct kmem_cache *ecryptfs_global_auth_tok_cache; int ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, - char *sig) + char *sig, u32 global_auth_tok_flags) { struct ecryptfs_global_auth_tok *new_auth_tok; int rc = 0; @@ -2389,6 +2389,7 @@ ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat, goto out; } memcpy(new_auth_tok->sig, sig, ECRYPTFS_SIG_SIZE_HEX); + new_auth_tok->flags = global_auth_tok_flags; new_auth_tok->sig[ECRYPTFS_SIG_SIZE_HEX] = '\0'; mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); list_add(&new_auth_tok->mount_crypt_stat_list, diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c index 789cf2e1be1e..aed56c25539b 100644 --- a/fs/ecryptfs/main.c +++ b/fs/ecryptfs/main.c @@ -319,7 +319,7 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options) 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); @@ -370,7 +370,8 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options) ECRYPTFS_SIG_SIZE_HEX] = '\0'; rc = ecryptfs_add_global_auth_tok( mount_crypt_stat, - mount_crypt_stat->global_default_fnek_sig); + 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", |