/** * eCryptfs: Linux filesystem encryption layer * * Copyright (C) 1997-2004 Erez Zadok * Copyright (C) 2001-2004 Stony Brook University * Copyright (C) 2004-2007 International Business Machines Corp. * Author(s): Michael A. Halcrow * Michael C. Thompson * * 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. */ #include #include #include #include #include #include #include #include #include #include "ecryptfs_kernel.h" #ifdef CONFIG_WTL_ENCRYPTION_FILTER #include #define ECRYPTFS_IOCTL_GET_ATTRIBUTES _IOR('l', 0x10, __u32) #define ECRYPTFS_WAS_ENCRYPTED 0x0080 #define ECRYPTFS_WAS_ENCRYPTED_OTHER_DEVICE 0x0100 #endif #ifdef CONFIG_SDP #if 0 #include #include #include #endif #include "ecryptfs_dek.h" #include "mm.h" #endif #ifdef CONFIG_DLP #include "ecryptfs_dlp.h" #include #include #endif /** * ecryptfs_read_update_atime * * generic_file_read updates the atime of upper layer inode. But, it * doesn't give us a chance to update the atime of the lower layer * inode. This function is a wrapper to generic_file_read. It * updates the atime of the lower level inode if generic_file_read * returns without any errors. This is to be used only for file reads. * The function to be used for directory reads is ecryptfs_read. */ static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb, struct iov_iter *to) { ssize_t rc; struct path *path; struct file *file = iocb->ki_filp; rc = generic_file_read_iter(iocb, to); /* * Even though this is a async interface, we need to wait * for IO to finish to update atime */ if (-EIOCBQUEUED == rc) rc = wait_on_sync_kiocb(iocb); if (rc >= 0) { path = ecryptfs_dentry_to_lower_path(file->f_path.dentry); touch_atime(path); } return rc; } struct ecryptfs_getdents_callback { struct dir_context ctx; struct dir_context *caller; struct super_block *sb; int filldir_called; int entries_written; }; /* Inspired by generic filldir in fs/readdir.c */ static int ecryptfs_filldir(void *dirent, const char *lower_name, int lower_namelen, loff_t offset, u64 ino, unsigned int d_type) { struct ecryptfs_getdents_callback *buf = (struct ecryptfs_getdents_callback *)dirent; size_t name_size; char *name; int rc; buf->filldir_called++; rc = ecryptfs_decode_and_decrypt_filename(&name, &name_size, buf->sb, lower_name, lower_namelen); if (rc) { printk(KERN_ERR "%s: Error attempting to decode and decrypt " "filename [%s]; rc = [%d]\n", __func__, lower_name, rc); goto out; } buf->caller->pos = buf->ctx.pos; rc = !dir_emit(buf->caller, name, name_size, ino, d_type); kfree(name); if (!rc) buf->entries_written++; out: return rc; } /** * ecryptfs_readdir * @file: The eCryptfs directory file * @ctx: The actor to feed the entries to */ static int ecryptfs_readdir(struct file *file, struct dir_context *ctx) { int rc; struct file *lower_file; struct inode *inode = file_inode(file); struct ecryptfs_getdents_callback buf = { .ctx.actor = ecryptfs_filldir, .caller = ctx, .sb = inode->i_sb, }; lower_file = ecryptfs_file_to_lower(file); lower_file->f_pos = ctx->pos; rc = iterate_dir(lower_file, &buf.ctx); ctx->pos = buf.ctx.pos; if (rc < 0) goto out; if (buf.filldir_called && !buf.entries_written) goto out; if (rc >= 0) fsstack_copy_attr_atime(inode, file_inode(lower_file)); out: return rc; } struct kmem_cache *ecryptfs_file_info_cache; static int read_or_initialize_metadata(struct dentry *dentry) { struct inode *inode = dentry->d_inode; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; struct ecryptfs_crypt_stat *crypt_stat; int rc; crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; mount_crypt_stat = &ecryptfs_superblock_to_private( inode->i_sb)->mount_crypt_stat; #ifdef CONFIG_WTL_ENCRYPTION_FILTER if (crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED && crypt_stat->flags & ECRYPTFS_POLICY_APPLIED && crypt_stat->flags & ECRYPTFS_ENCRYPTED && !(crypt_stat->flags & ECRYPTFS_KEY_VALID) && !(crypt_stat->flags & ECRYPTFS_KEY_SET) && crypt_stat->flags & ECRYPTFS_I_SIZE_INITIALIZED) { crypt_stat->flags |= ECRYPTFS_ENCRYPTED_OTHER_DEVICE; } mutex_lock(&crypt_stat->cs_mutex); if ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_NEW_PASSTHROUGH) && (crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { if (ecryptfs_read_metadata(dentry)) { crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED | ECRYPTFS_ENCRYPTED); rc = 0; goto out; } } else if ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_FILTERING) && (crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { struct dentry *fp_dentry = ecryptfs_inode_to_private(inode)->lower_file->f_dentry; char filename[NAME_MAX+1] = {0}; if (fp_dentry->d_name.len <= NAME_MAX) memcpy(filename, fp_dentry->d_name.name, fp_dentry->d_name.len + 1); if (is_file_name_match(mount_crypt_stat, fp_dentry) || is_file_ext_match(mount_crypt_stat, filename)) { if (ecryptfs_read_metadata(dentry)) crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED | ECRYPTFS_ENCRYPTED); rc = 0; goto out; } } mutex_unlock(&crypt_stat->cs_mutex); #endif mutex_lock(&crypt_stat->cs_mutex); if (crypt_stat->flags & ECRYPTFS_POLICY_APPLIED && crypt_stat->flags & ECRYPTFS_KEY_VALID) { rc = 0; goto out; } rc = ecryptfs_read_metadata(dentry); if (!rc) goto out; #ifdef CONFIG_SDP /* * no passthrough/xattr for sensitive files */ if ((rc) && crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) goto out; #endif if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED) { crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED | ECRYPTFS_ENCRYPTED); rc = 0; goto out; } if (!(mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED) && !i_size_read(ecryptfs_inode_to_lower(inode))) { rc = ecryptfs_initialize_file(dentry, inode); if (!rc) goto out; } rc = -EIO; out: mutex_unlock(&crypt_stat->cs_mutex); #ifdef CONFIG_SDP if(!rc) { /* * SDP v2.0 : sensitive directory (SDP vault) * Files under sensitive directory automatically becomes sensitive */ struct dentry *p = dentry->d_parent; struct inode *parent_inode = p->d_inode; struct ecryptfs_crypt_stat *parent_crypt_stat = &ecryptfs_inode_to_private(parent_inode)->crypt_stat; if (!(crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) && ((S_ISDIR(parent_inode->i_mode)) && (parent_crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE))) { rc = ecryptfs_sdp_set_sensitive(parent_crypt_stat->engine_id, dentry); } } #endif return rc; } #if defined(CONFIG_MMC_DW_FMP_ECRYPT_FS) || defined(CONFIG_UFS_FMP_ECRYPT_FS) static void ecryptfs_set_rapages(struct file *file, unsigned int flag) { if (!flag) file->f_ra.ra_pages = 0; else file->f_ra.ra_pages = (unsigned int)file->f_mapping->backing_dev_info->ra_pages; } static int ecryptfs_set_fmpinfo(struct file *file, struct inode *inode, unsigned int set_flag) { struct address_space *mapping = file->f_mapping; if (set_flag) { struct ecryptfs_crypt_stat *crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; struct ecryptfs_mount_crypt_stat *mount_crypt_stat = &ecryptfs_superblock_to_private(inode->i_sb)->mount_crypt_stat; if (strncmp(crypt_stat->cipher, "aesxts", sizeof("aesxts")) && strncmp(crypt_stat->cipher, "aes", sizeof("aes"))) { if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { mapping->plain_text = 1; return 0; } else { ecryptfs_printk(KERN_ERR, "%s: Error invalid file encryption algorithm, inode %lu, filename %s alg %s\n" , __func__, inode->i_ino, file->f_dentry->d_name.name, crypt_stat->cipher); return -EINVAL; } } mapping->iv = crypt_stat->root_iv; mapping->key = crypt_stat->key; mapping->sensitive_data_index = crypt_stat->metadata_size/4096; if (mount_crypt_stat->cipher_code == RFC2440_CIPHER_AES_XTS_256) { mapping->key_length = crypt_stat->key_size * 2; mapping->alg = "aesxts"; } else { mapping->key_length = crypt_stat->key_size; mapping->alg = crypt_stat->cipher; } mapping->hash_tfm = crypt_stat->hash_tfm; #ifdef CONFIG_CRYPTO_FIPS mapping->cc_enable = (mount_crypt_stat->flags & ECRYPTFS_ENABLE_CC)?1:0; #endif } else { mapping->iv = NULL; mapping->key = NULL; mapping->key_length = 0; mapping->sensitive_data_index = 0; mapping->alg = NULL; mapping->hash_tfm = NULL; #ifdef CONFIG_CRYPTO_FIPS mapping->cc_enable = 0; #endif mapping->plain_text = 0; } return 0; } void ecryptfs_propagate_rapages(struct file *file, unsigned int flag) { struct file *f = file; do { if (!f) return; ecryptfs_set_rapages(f, flag); } while(f->f_op->get_lower_file && (f = f->f_op->get_lower_file(f))); } int ecryptfs_propagate_fmpinfo(struct inode *inode, unsigned int flag) { struct file *f = ecryptfs_inode_to_private(inode)->lower_file; do { if (!f) return 0; if (ecryptfs_set_fmpinfo(f, inode, flag)) return -EINVAL; } while(f->f_op->get_lower_file && (f = f->f_op->get_lower_file(f))); return 0; } #endif /** * ecryptfs_open * @inode: inode speciying file to open * @file: Structure to return filled in * * Opens the file specified by inode. * * Returns zero on success; non-zero otherwise */ static int ecryptfs_open(struct inode *inode, struct file *file) { int rc = 0; struct ecryptfs_crypt_stat *crypt_stat = NULL; struct dentry *ecryptfs_dentry = file->f_path.dentry; /* Private value of ecryptfs_dentry allocated in * ecryptfs_lookup() */ struct ecryptfs_file_info *file_info; #ifdef CONFIG_DLP sdp_fs_command_t *cmd = NULL; ssize_t dlp_len = 0; struct knox_dlp_data dlp_data; struct timespec ts; #endif #if defined(CONFIG_MMC_DW_FMP_ECRYPT_FS) || defined(CONFIG_UFS_FMP_ECRYPT_FS) || defined(CONFIG_SDP) struct ecryptfs_mount_crypt_stat *mount_crypt_stat; mount_crypt_stat = &ecryptfs_superblock_to_private( inode->i_sb)->mount_crypt_stat; #endif /* Released in ecryptfs_release or end of function if failure */ file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL); ecryptfs_set_file_private(file, file_info); if (!file_info) { ecryptfs_printk(KERN_ERR, "Error attempting to allocate memory\n"); rc = -ENOMEM; goto out; } crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; mutex_lock(&crypt_stat->cs_mutex); if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) { ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n"); /* Policy code enabled in future release */ crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED | ECRYPTFS_ENCRYPTED); } mutex_unlock(&crypt_stat->cs_mutex); rc = ecryptfs_get_lower_file(ecryptfs_dentry, inode); if (rc) { printk(KERN_ERR "%s: Error attempting to initialize " "the lower file for the dentry with name " "[%pd]; rc = [%d]\n", __func__, ecryptfs_dentry, rc); goto out_free; } if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_ACCMODE) == O_RDONLY && (file->f_flags & O_ACCMODE) != O_RDONLY) { rc = -EPERM; printk(KERN_WARNING "%s: Lower file is RO; eCryptfs " "file must hence be opened RO\n", __func__); goto out_put; } ecryptfs_set_file_lower( file, ecryptfs_inode_to_private(inode)->lower_file); if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { #ifdef CONFIG_SDP /* * it's possible to have a sensitive directory. (vault) */ if (mount_crypt_stat->flags & ECRYPTFS_MOUNT_SDP_ENABLED) crypt_stat->flags |= ECRYPTFS_DEK_SDP_ENABLED; #endif ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); mutex_lock(&crypt_stat->cs_mutex); crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); mutex_unlock(&crypt_stat->cs_mutex); rc = 0; goto out; } rc = read_or_initialize_metadata(ecryptfs_dentry); if (rc) { #ifdef CONFIG_SDP if(file->f_flags & O_SDP){ printk("Failed to initialize metadata, " "but let it continue cause current call is from SDP API\n"); mutex_lock(&crypt_stat->cs_mutex); crypt_stat->flags &= ~(ECRYPTFS_KEY_VALID); mutex_unlock(&crypt_stat->cs_mutex); rc = 0; /* * Letting this continue doesn't mean to allow read/writing. It will anyway fail later. * * 1. In this stage, ecryptfs_stat won't have key/iv and encryption ctx. * 2. ECRYPTFS_KEY_VALID bit is off, next attempt will try reading metadata again. * 3. Skip DEK conversion. it cannot be done anyway. */ goto out; } #endif goto out_put; } #if defined(CONFIG_MMC_DW_FMP_ECRYPT_FS) || defined(CONFIG_UFS_FMP_ECRYPT_FS) if (mount_crypt_stat->flags & ECRYPTFS_USE_FMP) rc = ecryptfs_propagate_fmpinfo(inode, FMPINFO_SET); else rc = ecryptfs_propagate_fmpinfo(inode, FMPINFO_CLEAR); #endif if (rc) goto out_put; #ifdef CONFIG_SDP if (crypt_stat->flags & ECRYPTFS_DEK_IS_SENSITIVE) { #ifdef CONFIG_SDP_KEY_DUMP if (S_ISREG(ecryptfs_dentry->d_inode->i_mode)) { if(get_sdp_sysfs_key_dump()) { printk("FEK[%s] : ", ecryptfs_dentry->d_name.name); key_dump(crypt_stat->key, 32); } } #endif /* * Need to update sensitive mapping on file open */ if (S_ISREG(ecryptfs_dentry->d_inode->i_mode)) { ecryptfs_set_mapping_sensitive(inode, mount_crypt_stat->userid, TO_SENSITIVE); } if (ecryptfs_is_sdp_locked(crypt_stat->engine_id)) { ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is locked, rc=%d\n", rc); } else { int dek_type = crypt_stat->sdp_dek.type; ecryptfs_printk(KERN_INFO, "ecryptfs_open: persona is unlocked, rc=%d\n", rc); if(dek_type != DEK_TYPE_AES_ENC) { ecryptfs_printk(KERN_DEBUG, "converting dek...\n"); rc = ecryptfs_sdp_convert_dek(ecryptfs_dentry); ecryptfs_printk(KERN_DEBUG, "conversion ready, rc=%d\n", rc); rc = 0; // TODO: Do we need to return error if conversion fails? } } } #if ECRYPTFS_DEK_DEBUG else { ecryptfs_printk(KERN_INFO, "ecryptfs_open: dek_file_type is protected\n"); } #endif #endif #ifdef CONFIG_DLP if(crypt_stat->flags & ECRYPTFS_DLP_ENABLED) { #if DLP_DEBUG printk("DLP %s: try to open %s [%lu] with crypt_stat->flags %d\n", __func__, ecryptfs_dentry->d_name.name, inode->i_ino, crypt_stat->flags); #endif if (dlp_is_locked(mount_crypt_stat->userid)) { printk("%s: DLP locked\n", __func__); rc = -EPERM; goto out_put; } if(in_egroup_p(AID_KNOX_DLP) || in_egroup_p(AID_KNOX_DLP_RESTRICTED)) { dlp_len = ecryptfs_dentry->d_inode->i_op->getxattr( ecryptfs_dentry, KNOX_DLP_XATTR_NAME, &dlp_data, sizeof(dlp_data)); if (dlp_len == sizeof(dlp_data)) { getnstimeofday(&ts); #if DLP_DEBUG printk("DLP %s: current time [%ld/%ld] %s\n", __func__, (long)ts.tv_sec, (long)dlp_data.expiry_time.tv_sec, ecryptfs_dentry->d_name.name); #endif if ((ts.tv_sec > dlp_data.expiry_time.tv_sec) && dlp_isInterestedFile(mount_crypt_stat->userid, ecryptfs_dentry->d_name.name)==0) { /* Command to delete expired file */ cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_REMOVE, current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id, inode->i_ino, GFP_KERNEL); rc = -ENOENT; goto out_put; } } else if (dlp_len == -ENODATA) { /* DLP flag is set, but no DLP data. Let it continue, xattr will be set later */ printk("DLP %s: normal file [%s]\n", __func__, ecryptfs_dentry->d_name.name); } else { printk("DLP %s: Error, len [%ld], [%s]\n", __func__, (long)dlp_len, ecryptfs_dentry->d_name.name); rc = -EFAULT; goto out_put; } #if DLP_DEBUG printk("DLP %s: DLP file [%s] opened with tgid %d, %d\n" , __func__, ecryptfs_dentry->d_name.name, current->tgid, in_egroup_p(AID_KNOX_DLP_RESTRICTED)); #endif if(in_egroup_p(AID_KNOX_DLP_RESTRICTED)) { cmd = sdp_fs_command_alloc(FSOP_DLP_FILE_OPENED, current->tgid, mount_crypt_stat->userid, mount_crypt_stat->partition_id, inode->i_ino, GFP_KERNEL); } } else { printk("DLP %s: not DLP app [%s]\n", __func__, current->comm); rc = -EPERM; goto out_put; } } #endif ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = " "[0x%.16lx] size: [0x%.16llx]\n", inode, inode->i_ino, (unsigned long long)i_size_read(inode)); goto out; out_put: ecryptfs_put_lower_file(inode); out_free: kmem_cache_free(ecryptfs_file_info_cache, ecryptfs_file_to_private(file)); out: #ifdef CONFIG_DLP if(cmd) { sdp_fs_request(cmd, NULL); sdp_fs_command_free(cmd); } #endif return rc; } static int ecryptfs_flush(struct file *file, fl_owner_t td) { struct file *lower_file = ecryptfs_file_to_lower(file); if (lower_file->f_op->flush) { filemap_write_and_wait(file->f_mapping); return lower_file->f_op->flush(lower_file, td); } return 0; } static int ecryptfs_release(struct inode *inode, struct file *file) { #ifdef CONFIG_SDP struct ecryptfs_crypt_stat *crypt_stat; crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; mutex_lock(&crypt_stat->cs_mutex); #endif ecryptfs_put_lower_file(inode); #ifdef CONFIG_SDP mutex_unlock(&crypt_stat->cs_mutex); #endif kmem_cache_free(ecryptfs_file_info_cache, ecryptfs_file_to_private(file)); return 0; } static int ecryptfs_fsync(struct file *file, loff_t start, loff_t end, int datasync) { int rc; rc = filemap_write_and_wait(file->f_mapping); if (rc) return rc; return vfs_fsync(ecryptfs_file_to_lower(file), datasync); } static int ecryptfs_fasync(int fd, struct file *file, int flag) { int rc = 0; struct file *lower_file = NULL; lower_file = ecryptfs_file_to_lower(file); if (lower_file->f_op->fasync) rc = lower_file->f_op->fasync(fd, lower_file, flag); return rc; } static long ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct file *lower_file = ecryptfs_file_to_lower(file); long rc = -ENOTTY; #ifdef CONFIG_WTL_ENCRYPTION_FILTER if (cmd == ECRYPTFS_IOCTL_GET_ATTRIBUTES) { u32 __user *user_attr = (u32 __user *)arg; u32 attr = 0; char filename[NAME_MAX+1] = {0}; struct dentry *ecryptfs_dentry = file->f_path.dentry; struct ecryptfs_mount_crypt_stat *mount_crypt_stat = &ecryptfs_superblock_to_private(ecryptfs_dentry->d_sb) ->mount_crypt_stat; struct inode *inode = ecryptfs_dentry->d_inode; struct ecryptfs_crypt_stat *crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; struct dentry *fp_dentry = ecryptfs_inode_to_private(inode)->lower_file->f_dentry; if (fp_dentry->d_name.len <= NAME_MAX) memcpy(filename, fp_dentry->d_name.name, fp_dentry->d_name.len + 1); mutex_lock(&crypt_stat->cs_mutex); if ((crypt_stat->flags & ECRYPTFS_ENCRYPTED || crypt_stat->flags & ECRYPTFS_ENCRYPTED_OTHER_DEVICE) || ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_FILTERING) && (is_file_name_match (mount_crypt_stat, fp_dentry) || is_file_ext_match (mount_crypt_stat, filename)))) { if (crypt_stat->flags & ECRYPTFS_KEY_VALID) attr = ECRYPTFS_WAS_ENCRYPTED; else attr = ECRYPTFS_WAS_ENCRYPTED_OTHER_DEVICE; } mutex_unlock(&crypt_stat->cs_mutex); put_user(attr, user_attr); return 0; } #endif #ifdef CONFIG_SDP rc = ecryptfs_do_sdp_ioctl(file, cmd, arg); if (rc != EOPNOTSUPP) return rc; #else printk("%s CONFIG_SDP not enabled \n", __func__); #endif if (!lower_file->f_op->unlocked_ioctl) return rc; switch (cmd) { case FITRIM: case FS_IOC_GETFLAGS: case FS_IOC_SETFLAGS: case FS_IOC_GETVERSION: case FS_IOC_SETVERSION: rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg); fsstack_copy_attr_all(file_inode(file), file_inode(lower_file)); return rc; default: return rc; } } #ifdef CONFIG_COMPAT static long ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct file *lower_file = ecryptfs_file_to_lower(file); long rc = -ENOIOCTLCMD; #ifdef CONFIG_WTL_ENCRYPTION_FILTER if (cmd == ECRYPTFS_IOCTL_GET_ATTRIBUTES) { u32 __user *user_attr = (u32 __user *)arg; u32 attr = 0; char filename[NAME_MAX+1] = {0}; struct dentry *ecryptfs_dentry = file->f_path.dentry; struct ecryptfs_mount_crypt_stat *mount_crypt_stat = &ecryptfs_superblock_to_private(ecryptfs_dentry->d_sb) ->mount_crypt_stat; struct inode *inode = ecryptfs_dentry->d_inode; struct ecryptfs_crypt_stat *crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; struct dentry *fp_dentry = ecryptfs_inode_to_private(inode)->lower_file->f_dentry; if (fp_dentry->d_name.len <= NAME_MAX) memcpy(filename, fp_dentry->d_name.name, fp_dentry->d_name.len + 1); mutex_lock(&crypt_stat->cs_mutex); if ((crypt_stat->flags & ECRYPTFS_ENCRYPTED || crypt_stat->flags & ECRYPTFS_ENCRYPTED_OTHER_DEVICE) || ((mount_crypt_stat->flags & ECRYPTFS_ENABLE_FILTERING) && (is_file_name_match (mount_crypt_stat, fp_dentry) || is_file_ext_match (mount_crypt_stat, filename)))) { if (crypt_stat->flags & ECRYPTFS_KEY_VALID) attr = ECRYPTFS_WAS_ENCRYPTED; else attr = ECRYPTFS_WAS_ENCRYPTED_OTHER_DEVICE; } mutex_unlock(&crypt_stat->cs_mutex); put_user(attr, user_attr); return 0; } #endif #ifdef CONFIG_SDP rc = ecryptfs_do_sdp_ioctl(file, cmd, arg); if (rc != EOPNOTSUPP) return rc; #else printk("%s CONFIG_SDP not enabled \n", __func__); #endif if (!lower_file->f_op->compat_ioctl) return rc; switch (cmd) { case FITRIM: case FS_IOC32_GETFLAGS: case FS_IOC32_SETFLAGS: case FS_IOC32_GETVERSION: case FS_IOC32_SETVERSION: rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg); fsstack_copy_attr_all(file_inode(file), file_inode(lower_file)); return rc; default: return rc; } } #endif #ifdef CONFIG_WTL_ENCRYPTION_FILTER int is_file_name_match(struct ecryptfs_mount_crypt_stat *mcs, struct dentry *fp_dentry) { int i; char *str = NULL; if (!(strcmp("/", fp_dentry->d_name.name)) || !(strcmp("", fp_dentry->d_name.name))) return 0; str = kzalloc(mcs->max_name_filter_len + 1, GFP_KERNEL); if (!str) { printk(KERN_ERR "%s: Out of memory whilst attempting " "to kzalloc [%d] bytes\n", __func__, (mcs->max_name_filter_len + 1)); return 0; } for (i = 0; i < ENC_NAME_FILTER_MAX_INSTANCE; i++) { int len = 0; struct dentry *p = fp_dentry; if (!strlen(mcs->enc_filter_name[i])) break; while (1) { if (len == 0) { len = strlen(p->d_name.name); if (len > mcs->max_name_filter_len) break; strcpy(str, p->d_name.name); } else { len = len + 1 + strlen(p->d_name.name) ; if (len > mcs->max_name_filter_len) break; strcat(str, "/"); strcat(str, p->d_name.name); } if (strnicmp(str, mcs->enc_filter_name[i], len)) break; p = p->d_parent; if (!(strcmp("/", p->d_name.name)) || !(strcmp("", p->d_name.name))) { if (len == strlen(mcs->enc_filter_name[i])) { kfree(str); return 1; } break; } } } kfree(str); return 0; } int is_file_ext_match(struct ecryptfs_mount_crypt_stat *mcs, char *str) { int i; char ext[NAME_MAX + 1] = {0}; char *token; int count = 0; while ((token = strsep(&str, ".")) != NULL) { strncpy(ext, token, NAME_MAX); count++; } if (count <= 1) return 0; for (i = 0; i < ENC_EXT_FILTER_MAX_INSTANCE; i++) { if (!strlen(mcs->enc_filter_ext[i])) return 0; if (strlen(ext) != strlen(mcs->enc_filter_ext[i])) continue; if (!strnicmp(ext, mcs->enc_filter_ext[i], strlen(ext))) return 1; } return 0; } #endif const struct file_operations ecryptfs_dir_fops = { .iterate = ecryptfs_readdir, .read = generic_read_dir, .unlocked_ioctl = ecryptfs_unlocked_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = ecryptfs_compat_ioctl, #endif .open = ecryptfs_open, .flush = ecryptfs_flush, .release = ecryptfs_release, .fsync = ecryptfs_fsync, .fasync = ecryptfs_fasync, .splice_read = generic_file_splice_read, .llseek = default_llseek, }; const struct file_operations ecryptfs_main_fops = { .llseek = generic_file_llseek, .read = new_sync_read, .read_iter = ecryptfs_read_update_atime, .write = new_sync_write, .write_iter = generic_file_write_iter, .iterate = ecryptfs_readdir, .unlocked_ioctl = ecryptfs_unlocked_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = ecryptfs_compat_ioctl, #endif .mmap = generic_file_mmap, .open = ecryptfs_open, .flush = ecryptfs_flush, .release = ecryptfs_release, .fsync = ecryptfs_fsync, .fasync = ecryptfs_fasync, .splice_read = generic_file_splice_read, };