/** * eCryptfs: Linux filesystem encryption layer * Kernel declarations. * * Copyright (C) 1997-2003 Erez Zadok * Copyright (C) 2001-2003 Stony Brook University * Copyright (C) 2004-2007 International Business Machines Corp. * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> * Trevor S. Highland <trevor.highland@gmail.com> * Tyler Hicks <tyhicks@ou.edu> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. */ #ifndef ECRYPTFS_KERNEL_H#define ECRYPTFS_KERNEL_H #include <keys/user-type.h>#include <linux/fs.h>#include <linux/fs_stack.h>#include <linux/namei.h>#include <linux/scatterlist.h>#include <linux/hash.h> /* Version verification for shared data structures w/ userspace */#define ECRYPTFS_VERSION_MAJOR 0x00#define ECRYPTFS_VERSION_MINOR 0x04#define ECRYPTFS_SUPPORTED_FILE_VERSION 0x02/* These flags indicate which features are supported by the kernel * module; userspace tools such as the mount helper read * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine * how to behave. */#define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001#define ECRYPTFS_VERSIONING_PUBKEY 0x00000002#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004#define ECRYPTFS_VERSIONING_POLICY 0x00000008#define ECRYPTFS_VERSIONING_XATTR 0x00000010#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ | ECRYPTFS_VERSIONING_PUBKEY \ | ECRYPTFS_VERSIONING_XATTR)#define ECRYPTFS_MAX_PASSWORD_LENGTH 64#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH#define ECRYPTFS_SALT_SIZE 8#define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2)/* The original signature size is only for what is stored on disk; all * in-memory representations are expanded hex, so it better adapted to * be passed around or referenced on the command line */#define ECRYPTFS_SIG_SIZE 8#define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2)#define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX#define ECRYPTFS_MAX_KEY_BYTES 64#define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512#define ECRYPTFS_DEFAULT_IV_BYTES 16#define ECRYPTFS_FILE_VERSION 0x02#define ECRYPTFS_DEFAULT_HEADER_EXTENT_SIZE 8192#define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096#define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192#define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32#define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ#define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3)#define ECRYPTFS_NLMSG_HELO 100#define ECRYPTFS_NLMSG_QUIT 101#define ECRYPTFS_NLMSG_REQUEST 102#define ECRYPTFS_NLMSG_RESPONSE 103#define ECRYPTFS_MAX_PKI_NAME_BYTES 16#define ECRYPTFS_DEFAULT_NUM_USERS 4#define ECRYPTFS_MAX_NUM_USERS 32768#define ECRYPTFS_TRANSPORT_NETLINK 0#define ECRYPTFS_TRANSPORT_CONNECTOR 1#define ECRYPTFS_TRANSPORT_RELAYFS 2#define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_NETLINK#define ECRYPTFS_XATTR_NAME "user.ecryptfs" #define RFC2440_CIPHER_DES3_EDE 0x02#define RFC2440_CIPHER_CAST_5 0x03#define RFC2440_CIPHER_BLOWFISH 0x04#define RFC2440_CIPHER_AES_128 0x07#define RFC2440_CIPHER_AES_192 0x08#define RFC2440_CIPHER_AES_256 0x09#define RFC2440_CIPHER_TWOFISH 0x0a#define RFC2440_CIPHER_CAST_6 0x0b #define RFC2440_CIPHER_RSA 0x01 /** * For convenience, we may need to pass around the encrypted session * key between kernel and userspace because the authentication token * may not be extractable. For example, the TPM may not release the * private key, instead requiring the encrypted data and returning the * decrypted data. */struct ecryptfs_session_key {#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001#define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002#define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004#define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008 u32 flags; u32 encrypted_key_size; u32 decrypted_key_size; u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES];}; struct ecryptfs_password { u32 password_bytes; s32 hash_algo; u32 hash_iterations; u32 session_key_encryption_key_bytes;#define ECRYPTFS_PERSISTENT_PASSWORD 0x01#define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02 u32 flags; /* Iterated-hash concatenation of salt and passphrase */ u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES]; u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1]; /* Always in expanded hex */ u8 salt[ECRYPTFS_SALT_SIZE];}; enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY}; struct ecryptfs_private_key { u32 key_size; u32 data_len; u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1]; char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1]; u8 data[];}; /* May be a password or a private key */struct ecryptfs_auth_tok { u16 version; /* 8-bit major and 8-bit minor */ u16 token_type; u32 flags; struct ecryptfs_session_key session_key; u8 reserved[32]; union { struct ecryptfs_password password; struct ecryptfs_private_key private_key; } token;} __attribute__ ((packed)); void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); struct ecryptfs_key_record { unsigned char type; size_t enc_key_size; unsigned char sig[ECRYPTFS_SIG_SIZE]; unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES];}; struct ecryptfs_auth_tok_list { struct ecryptfs_auth_tok *auth_tok; struct list_head list;}; struct ecryptfs_crypt_stat;struct ecryptfs_mount_crypt_stat; struct ecryptfs_page_crypt_context { struct page *page;#define ECRYPTFS_PREPARE_COMMIT_MODE 0#define ECRYPTFS_WRITEPAGE_MODE 1 unsigned int mode; union { struct file *lower_file; struct writeback_control *wbc; } param;}; static inline struct ecryptfs_auth_tok *ecryptfs_get_key_payload_data(struct key *key){ return (struct ecryptfs_auth_tok *) (((struct user_key_payload*)key->payload.data)->data);} #define ECRYPTFS_SUPER_MAGIC 0xf15f#define ECRYPTFS_MAX_KEYSET_SIZE 1024#define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32#define ECRYPTFS_MAX_NUM_ENC_KEYS 64#define ECRYPTFS_MAX_NUM_KEYSIGS 2 /* TODO: Make this a linked list */#define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */#define ECRYPTFS_SALT_BYTES 2#define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5#define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */#define ECRYPTFS_FILE_SIZE_BYTES 8#define ECRYPTFS_DEFAULT_CIPHER "aes"#define ECRYPTFS_DEFAULT_KEY_BYTES 16#define ECRYPTFS_DEFAULT_HASH "md5"#define ECRYPTFS_TAG_1_PACKET_TYPE 0x01#define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C#define ECRYPTFS_TAG_11_PACKET_TYPE 0xED#define ECRYPTFS_TAG_64_PACKET_TYPE 0x40#define ECRYPTFS_TAG_65_PACKET_TYPE 0x41#define ECRYPTFS_TAG_66_PACKET_TYPE 0x42#define ECRYPTFS_TAG_67_PACKET_TYPE 0x43#define MD5_DIGEST_SIZE 16 /** * This is the primary struct associated with each encrypted file. * * TODO: cache align/pack? */struct ecryptfs_crypt_stat {#define ECRYPTFS_STRUCT_INITIALIZED 0x00000001#define ECRYPTFS_POLICY_APPLIED 0x00000002#define ECRYPTFS_NEW_FILE 0x00000004#define ECRYPTFS_ENCRYPTED 0x00000008#define ECRYPTFS_SECURITY_WARNING 0x00000010#define ECRYPTFS_ENABLE_HMAC 0x00000020#define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000040#define ECRYPTFS_KEY_VALID 0x00000080#define ECRYPTFS_METADATA_IN_XATTR 0x00000100#define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000200 u32 flags; unsigned int file_version; size_t iv_bytes; size_t num_keysigs; size_t header_extent_size; size_t num_header_extents_at_front; size_t extent_size; /* Data extent size; default is 4096 */ size_t key_size; size_t extent_shift; unsigned int extent_mask; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; struct crypto_blkcipher *tfm; struct crypto_hash *hash_tfm; /* Crypto context for generating * the initialization vectors */ unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE]; unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; unsigned char keysigs[ECRYPTFS_MAX_NUM_KEYSIGS][ECRYPTFS_SIG_SIZE_HEX]; struct mutex cs_tfm_mutex; struct mutex cs_hash_tfm_mutex; struct mutex cs_mutex;}; /* inode private data. */struct ecryptfs_inode_info { struct inode vfs_inode; struct inode *wii_inode; struct ecryptfs_crypt_stat crypt_stat;}; /* dentry private data. Each dentry must keep track of a lower * vfsmount too. */struct ecryptfs_dentry_info { struct path lower_path; struct ecryptfs_crypt_stat *crypt_stat;}; /** * This struct is to enable a mount-wide passphrase/salt combo. This * is more or less a stopgap to provide similar functionality to other * crypto filesystems like EncFS or CFS until full policy support is * implemented in eCryptfs. */struct ecryptfs_mount_crypt_stat { /* Pointers to memory we do not own, do not free these */#define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001#define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002#define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 u32 flags; struct ecryptfs_auth_tok *global_auth_tok; struct key *global_auth_tok_key; size_t global_default_cipher_key_size; struct crypto_blkcipher *global_key_tfm; struct mutex global_key_tfm_mutex; unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; unsigned char global_auth_tok_sig[ECRYPTFS_SIG_SIZE_HEX + 1];}; /* superblock private data. */struct ecryptfs_sb_info { struct super_block *wsi_sb; struct ecryptfs_mount_crypt_stat mount_crypt_stat;}; /* file private data. */struct ecryptfs_file_info { struct file *wfi_file; struct ecryptfs_crypt_stat *crypt_stat;}; /* auth_tok <=> encrypted_session_key mappings */struct ecryptfs_auth_tok_list_item { unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES]; struct list_head list; struct ecryptfs_auth_tok auth_tok;}; struct ecryptfs_message { u32 index; u32 data_len; u8 data[];}; struct ecryptfs_msg_ctx {#define ECRYPTFS_MSG_CTX_STATE_FREE 0x0001#define ECRYPTFS_MSG_CTX_STATE_PENDING 0x0002#define ECRYPTFS_MSG_CTX_STATE_DONE 0x0003 u32 state; unsigned int index; unsigned int counter; struct ecryptfs_message *msg; struct task_struct *task; struct list_head node; struct mutex mux;}; extern unsigned int ecryptfs_transport; struct ecryptfs_daemon_id { pid_t pid; uid_t uid; struct hlist_node id_chain;}; static inline struct ecryptfs_file_info *ecryptfs_file_to_private(struct file *file){ return (struct ecryptfs_file_info *)file->private_data;} static inline voidecryptfs_set_file_private(struct file *file, struct ecryptfs_file_info *file_info){ file->private_data = file_info;} static inline struct file *ecryptfs_file_to_lower(struct file *file){ return ((struct ecryptfs_file_info *)file->private_data)->wfi_file;} static inline voidecryptfs_set_file_lower(struct file *file, struct file *lower_file){ ((struct ecryptfs_file_info *)file->private_data)->wfi_file = lower_file;} static inline struct ecryptfs_inode_info *ecryptfs_inode_to_private(struct inode *inode){ return container_of(inode, struct ecryptfs_inode_info, vfs_inode);} static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode){ return ecryptfs_inode_to_private(inode)->wii_inode;} static inline voidecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode){ ecryptfs_inode_to_private(inode)->wii_inode = lower_inode;} static inline struct ecryptfs_sb_info *ecryptfs_superblock_to_private(struct super_block *sb){ return (struct ecryptfs_sb_info *)sb->s_fs_info;} static inline voidecryptfs_set_superblock_private(struct super_block *sb, struct ecryptfs_sb_info *sb_info){ sb->s_fs_info = sb_info;} static inline struct super_block *ecryptfs_superblock_to_lower(struct super_block *sb){ return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb;} static inline voidecryptfs_set_superblock_lower(struct super_block *sb, struct super_block *lower_sb){ ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb;} static inline struct ecryptfs_dentry_info *ecryptfs_dentry_to_private(struct dentry *dentry){ return (struct ecryptfs_dentry_info *)dentry->d_fsdata;} static inline voidecryptfs_set_dentry_private(struct dentry *dentry, struct ecryptfs_dentry_info *dentry_info){ dentry->d_fsdata = dentry_info;} static inline struct dentry *ecryptfs_dentry_to_lower(struct dentry *dentry){ return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry;} static inline voidecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry){ ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry = lower_dentry;} static inline struct vfsmount *ecryptfs_dentry_to_lower_mnt(struct dentry *dentry){ return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt;} static inline voidecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt){ ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt = lower_mnt;} #define ecryptfs_printk(type, fmt, arg...) \ __ecryptfs_printk(type "%s: " fmt, __FUNCTION__, ## arg);void __ecryptfs_printk(const char *fmt, ...); extern const struct file_operations ecryptfs_main_fops;extern const struct file_operations ecryptfs_dir_fops;extern const struct inode_operations ecryptfs_main_iops;extern const struct inode_operations ecryptfs_dir_iops;extern const struct inode_operations ecryptfs_symlink_iops;extern const struct super_operations ecryptfs_sops;extern struct dentry_operations ecryptfs_dops;extern struct address_space_operations ecryptfs_aops;extern int ecryptfs_verbosity;extern unsigned int ecryptfs_message_buf_len;extern signed long ecryptfs_message_wait_timeout;extern unsigned int ecryptfs_number_of_users; extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache;extern struct kmem_cache *ecryptfs_file_info_cache;extern struct kmem_cache *ecryptfs_dentry_info_cache;extern struct kmem_cache *ecryptfs_inode_info_cache;extern struct kmem_cache *ecryptfs_sb_info_cache;extern struct kmem_cache *ecryptfs_header_cache_0;extern struct kmem_cache *ecryptfs_header_cache_1;extern struct kmem_cache *ecryptfs_header_cache_2;extern struct kmem_cache *ecryptfs_xattr_cache;extern struct kmem_cache *ecryptfs_lower_page_cache;extern struct kmem_cache *ecryptfs_key_record_cache; int ecryptfs_interpose(struct dentry *hidden_dentry, struct dentry *this_dentry, struct super_block *sb, int flag);int ecryptfs_fill_zeros(struct file *file, loff_t new_length);int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat, const char *name, int length, char **decrypted_name);int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat, const char *name, int length, char **encoded_name);struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry);void ecryptfs_dump_hex(char *data, int bytes);int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, int sg_size);int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat);void ecryptfs_rotate_iv(unsigned char *iv);void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);void ecryptfs_destruct_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);void ecryptfs_destruct_mount_crypt_stat( struct ecryptfs_mount_crypt_stat *mount_crypt_stat);int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);int ecryptfs_crypto_api_algify_cipher_name(char **algified_name, char *cipher_name, char *chaining_modifier);#define ECRYPTFS_LOWER_I_MUTEX_NOT_HELD 0#define ECRYPTFS_LOWER_I_MUTEX_HELD 1int ecryptfs_write_inode_size_to_metadata(struct file *lower_file, struct inode *lower_inode, struct inode *inode,Lines 1–500 of 586. 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/** * eCryptfs: Linux filesystem encryption layer * Kernel declarations. * * Copyright (C) 1997-2003 Erez Zadok * Copyright (C) 2001-2003 Stony Brook University * Copyright (C) 2004-2007 International Business Machines Corp. * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> * Trevor S. Highland <trevor.highland@gmail.com> * Tyler Hicks <tyhicks@ou.edu> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. */ #ifndef ECRYPTFS_KERNEL_H #define ECRYPTFS_KERNEL_H #include <keys/user-type.h> #include <linux/fs.h> #include <linux/fs_stack.h> #include <linux/namei.h> #include <linux/scatterlist.h> #include <linux/hash.h> /* Version verification for shared data structures w/ userspace */ #define ECRYPTFS_VERSION_MAJOR 0x00 #define ECRYPTFS_VERSION_MINOR 0x04 #define ECRYPTFS_SUPPORTED_FILE_VERSION 0x02 /* These flags indicate which features are supported by the kernel * module; userspace tools such as the mount helper read * ECRYPTFS_VERSIONING_MASK from a sysfs handle in order to determine * how to behave. */ #define ECRYPTFS_VERSIONING_PASSPHRASE 0x00000001 #define ECRYPTFS_VERSIONING_PUBKEY 0x00000002 #define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004 #define ECRYPTFS_VERSIONING_POLICY 0x00000008 #define ECRYPTFS_VERSIONING_XATTR 0x00000010 #define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ | ECRYPTFS_VERSIONING_PUBKEY \ | ECRYPTFS_VERSIONING_XATTR) #define ECRYPTFS_MAX_PASSWORD_LENGTH 64 #define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH #define ECRYPTFS_SALT_SIZE 8 #define ECRYPTFS_SALT_SIZE_HEX (ECRYPTFS_SALT_SIZE*2) /* The original signature size is only for what is stored on disk; all * in-memory representations are expanded hex, so it better adapted to * be passed around or referenced on the command line */ #define ECRYPTFS_SIG_SIZE 8 #define ECRYPTFS_SIG_SIZE_HEX (ECRYPTFS_SIG_SIZE*2) #define ECRYPTFS_PASSWORD_SIG_SIZE ECRYPTFS_SIG_SIZE_HEX #define ECRYPTFS_MAX_KEY_BYTES 64 #define ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 512 #define ECRYPTFS_DEFAULT_IV_BYTES 16 #define ECRYPTFS_FILE_VERSION 0x02 #define ECRYPTFS_DEFAULT_HEADER_EXTENT_SIZE 8192 #define ECRYPTFS_DEFAULT_EXTENT_SIZE 4096 #define ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE 8192 #define ECRYPTFS_DEFAULT_MSG_CTX_ELEMS 32 #define ECRYPTFS_DEFAULT_SEND_TIMEOUT HZ #define ECRYPTFS_MAX_MSG_CTX_TTL (HZ*3) #define ECRYPTFS_NLMSG_HELO 100 #define ECRYPTFS_NLMSG_QUIT 101 #define ECRYPTFS_NLMSG_REQUEST 102 #define ECRYPTFS_NLMSG_RESPONSE 103 #define ECRYPTFS_MAX_PKI_NAME_BYTES 16 #define ECRYPTFS_DEFAULT_NUM_USERS 4 #define ECRYPTFS_MAX_NUM_USERS 32768 #define ECRYPTFS_TRANSPORT_NETLINK 0 #define ECRYPTFS_TRANSPORT_CONNECTOR 1 #define ECRYPTFS_TRANSPORT_RELAYFS 2 #define ECRYPTFS_DEFAULT_TRANSPORT ECRYPTFS_TRANSPORT_NETLINK #define ECRYPTFS_XATTR_NAME "user.ecryptfs" #define RFC2440_CIPHER_DES3_EDE 0x02 #define RFC2440_CIPHER_CAST_5 0x03 #define RFC2440_CIPHER_BLOWFISH 0x04 #define RFC2440_CIPHER_AES_128 0x07 #define RFC2440_CIPHER_AES_192 0x08 #define RFC2440_CIPHER_AES_256 0x09 #define RFC2440_CIPHER_TWOFISH 0x0a #define RFC2440_CIPHER_CAST_6 0x0b #define RFC2440_CIPHER_RSA 0x01 /** * For convenience, we may need to pass around the encrypted session * key between kernel and userspace because the authentication token * may not be extractable. For example, the TPM may not release the * private key, instead requiring the encrypted data and returning the * decrypted data. */ struct ecryptfs_session_key { #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT 0x00000001 #define ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT 0x00000002 #define ECRYPTFS_CONTAINS_DECRYPTED_KEY 0x00000004 #define ECRYPTFS_CONTAINS_ENCRYPTED_KEY 0x00000008 u32 flags; u32 encrypted_key_size; u32 decrypted_key_size; u8 encrypted_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; u8 decrypted_key[ECRYPTFS_MAX_KEY_BYTES]; }; struct ecryptfs_password { u32 password_bytes; s32 hash_algo; u32 hash_iterations; u32 session_key_encryption_key_bytes; #define ECRYPTFS_PERSISTENT_PASSWORD 0x01 #define ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET 0x02 u32 flags; /* Iterated-hash concatenation of salt and passphrase */ u8 session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES]; u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1]; /* Always in expanded hex */ u8 salt[ECRYPTFS_SALT_SIZE]; }; enum ecryptfs_token_types {ECRYPTFS_PASSWORD, ECRYPTFS_PRIVATE_KEY}; struct ecryptfs_private_key { u32 key_size; u32 data_len; u8 signature[ECRYPTFS_PASSWORD_SIG_SIZE + 1]; char pki_type[ECRYPTFS_MAX_PKI_NAME_BYTES + 1]; u8 data[]; }; /* May be a password or a private key */ struct ecryptfs_auth_tok { u16 version; /* 8-bit major and 8-bit minor */ u16 token_type; u32 flags; struct ecryptfs_session_key session_key; u8 reserved[32]; union { struct ecryptfs_password password; struct ecryptfs_private_key private_key; } token; } __attribute__ ((packed)); void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok); extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size); extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); struct ecryptfs_key_record { unsigned char type; size_t enc_key_size; unsigned char sig[ECRYPTFS_SIG_SIZE]; unsigned char enc_key[ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES]; }; struct ecryptfs_auth_tok_list { struct ecryptfs_auth_tok *auth_tok; struct list_head list; }; struct ecryptfs_crypt_stat; struct ecryptfs_mount_crypt_stat; struct ecryptfs_page_crypt_context { struct page *page; #define ECRYPTFS_PREPARE_COMMIT_MODE 0 #define ECRYPTFS_WRITEPAGE_MODE 1 unsigned int mode; union { struct file *lower_file; struct writeback_control *wbc; } param; }; static inline struct ecryptfs_auth_tok * ecryptfs_get_key_payload_data(struct key *key) { return (struct ecryptfs_auth_tok *) (((struct user_key_payload*)key->payload.data)->data); } #define ECRYPTFS_SUPER_MAGIC 0xf15f #define ECRYPTFS_MAX_KEYSET_SIZE 1024 #define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32 #define ECRYPTFS_MAX_NUM_ENC_KEYS 64 #define ECRYPTFS_MAX_NUM_KEYSIGS 2 /* TODO: Make this a linked list */ #define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */ #define ECRYPTFS_SALT_BYTES 2 #define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5 #define MAGIC_ECRYPTFS_MARKER_SIZE_BYTES 8 /* 4*2 */ #define ECRYPTFS_FILE_SIZE_BYTES 8 #define ECRYPTFS_DEFAULT_CIPHER "aes" #define ECRYPTFS_DEFAULT_KEY_BYTES 16 #define ECRYPTFS_DEFAULT_HASH "md5" #define ECRYPTFS_TAG_1_PACKET_TYPE 0x01 #define ECRYPTFS_TAG_3_PACKET_TYPE 0x8C #define ECRYPTFS_TAG_11_PACKET_TYPE 0xED #define ECRYPTFS_TAG_64_PACKET_TYPE 0x40 #define ECRYPTFS_TAG_65_PACKET_TYPE 0x41 #define ECRYPTFS_TAG_66_PACKET_TYPE 0x42 #define ECRYPTFS_TAG_67_PACKET_TYPE 0x43 #define MD5_DIGEST_SIZE 16 /** * This is the primary struct associated with each encrypted file. * * TODO: cache align/pack? */ struct ecryptfs_crypt_stat { #define ECRYPTFS_STRUCT_INITIALIZED 0x00000001 #define ECRYPTFS_POLICY_APPLIED 0x00000002 #define ECRYPTFS_NEW_FILE 0x00000004 #define ECRYPTFS_ENCRYPTED 0x00000008 #define ECRYPTFS_SECURITY_WARNING 0x00000010 #define ECRYPTFS_ENABLE_HMAC 0x00000020 #define ECRYPTFS_ENCRYPT_IV_PAGES 0x00000040 #define ECRYPTFS_KEY_VALID 0x00000080 #define ECRYPTFS_METADATA_IN_XATTR 0x00000100 #define ECRYPTFS_VIEW_AS_ENCRYPTED 0x00000200 u32 flags; unsigned int file_version; size_t iv_bytes; size_t num_keysigs; size_t header_extent_size; size_t num_header_extents_at_front; size_t extent_size; /* Data extent size; default is 4096 */ size_t key_size; size_t extent_shift; unsigned int extent_mask; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; struct crypto_blkcipher *tfm; struct crypto_hash *hash_tfm; /* Crypto context for generating * the initialization vectors */ unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE]; unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; unsigned char keysigs[ECRYPTFS_MAX_NUM_KEYSIGS][ECRYPTFS_SIG_SIZE_HEX]; struct mutex cs_tfm_mutex; struct mutex cs_hash_tfm_mutex; struct mutex cs_mutex; }; /* inode private data. */ struct ecryptfs_inode_info { struct inode vfs_inode; struct inode *wii_inode; struct ecryptfs_crypt_stat crypt_stat; }; /* dentry private data. Each dentry must keep track of a lower * vfsmount too. */ struct ecryptfs_dentry_info { struct path lower_path; struct ecryptfs_crypt_stat *crypt_stat; }; /** * This struct is to enable a mount-wide passphrase/salt combo. This * is more or less a stopgap to provide similar functionality to other * crypto filesystems like EncFS or CFS until full policy support is * implemented in eCryptfs. */ struct ecryptfs_mount_crypt_stat { /* Pointers to memory we do not own, do not free these */ #define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 #define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 #define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 u32 flags; struct ecryptfs_auth_tok *global_auth_tok; struct key *global_auth_tok_key; size_t global_default_cipher_key_size; struct crypto_blkcipher *global_key_tfm; struct mutex global_key_tfm_mutex; unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1]; unsigned char global_auth_tok_sig[ECRYPTFS_SIG_SIZE_HEX + 1]; }; /* superblock private data. */ struct ecryptfs_sb_info { struct super_block *wsi_sb; struct ecryptfs_mount_crypt_stat mount_crypt_stat; }; /* file private data. */ struct ecryptfs_file_info { struct file *wfi_file; struct ecryptfs_crypt_stat *crypt_stat; }; /* auth_tok <=> encrypted_session_key mappings */ struct ecryptfs_auth_tok_list_item { unsigned char encrypted_session_key[ECRYPTFS_MAX_KEY_BYTES]; struct list_head list; struct ecryptfs_auth_tok auth_tok; }; struct ecryptfs_message { u32 index; u32 data_len; u8 data[]; }; struct ecryptfs_msg_ctx { #define ECRYPTFS_MSG_CTX_STATE_FREE 0x0001 #define ECRYPTFS_MSG_CTX_STATE_PENDING 0x0002 #define ECRYPTFS_MSG_CTX_STATE_DONE 0x0003 u32 state; unsigned int index; unsigned int counter; struct ecryptfs_message *msg; struct task_struct *task; struct list_head node; struct mutex mux; }; extern unsigned int ecryptfs_transport; struct ecryptfs_daemon_id { pid_t pid; uid_t uid; struct hlist_node id_chain; }; static inline struct ecryptfs_file_info * ecryptfs_file_to_private(struct file *file) { return (struct ecryptfs_file_info *)file->private_data; } static inline void ecryptfs_set_file_private(struct file *file, struct ecryptfs_file_info *file_info) { file->private_data = file_info; } static inline struct file *ecryptfs_file_to_lower(struct file *file) { return ((struct ecryptfs_file_info *)file->private_data)->wfi_file; } static inline void ecryptfs_set_file_lower(struct file *file, struct file *lower_file) { ((struct ecryptfs_file_info *)file->private_data)->wfi_file = lower_file; } static inline struct ecryptfs_inode_info * ecryptfs_inode_to_private(struct inode *inode) { return container_of(inode, struct ecryptfs_inode_info, vfs_inode); } static inline struct inode *ecryptfs_inode_to_lower(struct inode *inode) { return ecryptfs_inode_to_private(inode)->wii_inode; } static inline void ecryptfs_set_inode_lower(struct inode *inode, struct inode *lower_inode) { ecryptfs_inode_to_private(inode)->wii_inode = lower_inode; } static inline struct ecryptfs_sb_info * ecryptfs_superblock_to_private(struct super_block *sb) { return (struct ecryptfs_sb_info *)sb->s_fs_info; } static inline void ecryptfs_set_superblock_private(struct super_block *sb, struct ecryptfs_sb_info *sb_info) { sb->s_fs_info = sb_info; } static inline struct super_block * ecryptfs_superblock_to_lower(struct super_block *sb) { return ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb; } static inline void ecryptfs_set_superblock_lower(struct super_block *sb, struct super_block *lower_sb) { ((struct ecryptfs_sb_info *)sb->s_fs_info)->wsi_sb = lower_sb; } static inline struct ecryptfs_dentry_info * ecryptfs_dentry_to_private(struct dentry *dentry) { return (struct ecryptfs_dentry_info *)dentry->d_fsdata; } static inline void ecryptfs_set_dentry_private(struct dentry *dentry, struct ecryptfs_dentry_info *dentry_info) { dentry->d_fsdata = dentry_info; } static inline struct dentry * ecryptfs_dentry_to_lower(struct dentry *dentry) { return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry; } static inline void ecryptfs_set_dentry_lower(struct dentry *dentry, struct dentry *lower_dentry) { ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.dentry = lower_dentry; } static inline struct vfsmount * ecryptfs_dentry_to_lower_mnt(struct dentry *dentry) { return ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt; } static inline void ecryptfs_set_dentry_lower_mnt(struct dentry *dentry, struct vfsmount *lower_mnt) { ((struct ecryptfs_dentry_info *)dentry->d_fsdata)->lower_path.mnt = lower_mnt; } #define ecryptfs_printk(type, fmt, arg...) \ __ecryptfs_printk(type "%s: " fmt, __FUNCTION__, ## arg); void __ecryptfs_printk(const char *fmt, ...); extern const struct file_operations ecryptfs_main_fops; extern const struct file_operations ecryptfs_dir_fops; extern const struct inode_operations ecryptfs_main_iops; extern const struct inode_operations ecryptfs_dir_iops; extern const struct inode_operations ecryptfs_symlink_iops; extern const struct super_operations ecryptfs_sops; extern struct dentry_operations ecryptfs_dops; extern struct address_space_operations ecryptfs_aops; extern int ecryptfs_verbosity; extern unsigned int ecryptfs_message_buf_len; extern signed long ecryptfs_message_wait_timeout; extern unsigned int ecryptfs_number_of_users; extern struct kmem_cache *ecryptfs_auth_tok_list_item_cache; extern struct kmem_cache *ecryptfs_file_info_cache; extern struct kmem_cache *ecryptfs_dentry_info_cache; extern struct kmem_cache *ecryptfs_inode_info_cache; extern struct kmem_cache *ecryptfs_sb_info_cache; extern struct kmem_cache *ecryptfs_header_cache_0; extern struct kmem_cache *ecryptfs_header_cache_1; extern struct kmem_cache *ecryptfs_header_cache_2; extern struct kmem_cache *ecryptfs_xattr_cache; extern struct kmem_cache *ecryptfs_lower_page_cache; extern struct kmem_cache *ecryptfs_key_record_cache; int ecryptfs_interpose(struct dentry *hidden_dentry, struct dentry *this_dentry, struct super_block *sb, int flag); int ecryptfs_fill_zeros(struct file *file, loff_t new_length); int ecryptfs_decode_filename(struct ecryptfs_crypt_stat *crypt_stat, const char *name, int length, char **decrypted_name); int ecryptfs_encode_filename(struct ecryptfs_crypt_stat *crypt_stat, const char *name, int length, char **encoded_name); struct dentry *ecryptfs_lower_dentry(struct dentry *this_dentry); void ecryptfs_dump_hex(char *data, int bytes); int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg, int sg_size); int ecryptfs_compute_root_iv(struct ecryptfs_crypt_stat *crypt_stat); void ecryptfs_rotate_iv(unsigned char *iv); void ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); void ecryptfs_destruct_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat); void ecryptfs_destruct_mount_crypt_stat( struct ecryptfs_mount_crypt_stat *mount_crypt_stat); int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat); int ecryptfs_crypto_api_algify_cipher_name(char **algified_name, char *cipher_name, char *chaining_modifier); #define ECRYPTFS_LOWER_I_MUTEX_NOT_HELD 0 #define ECRYPTFS_LOWER_I_MUTEX_HELD 1 int ecryptfs_write_inode_size_to_metadata(struct file *lower_file, struct inode *lower_inode, struct inode *inode,