X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fecryptfs%2Fmain.c;h=af1a8f01ebacd854789283267c9ce80688f48b64;hb=5a0e3ad6af8660be21ca98a971cd00f331318c05;hp=d9f53c331a279439449648cce01f32cd32a8d623;hpb=7896b631823c6e8f1a520d89390624a51445840e;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c index d9f53c3..af1a8f0 100644 --- a/fs/ecryptfs/main.c +++ b/fs/ecryptfs/main.c @@ -30,12 +30,12 @@ #include #include #include -#include #include #include #include #include #include +#include #include "ecryptfs_kernel.h" /** @@ -49,8 +49,7 @@ MODULE_PARM_DESC(ecryptfs_verbosity, "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; @@ -60,9 +59,9 @@ MODULE_PARM_DESC(ecryptfs_message_buf_len, /** * 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; @@ -83,8 +82,6 @@ module_param(ecryptfs_number_of_users, uint, 0); 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; @@ -117,8 +114,9 @@ void __ecryptfs_printk(const char *fmt, ...) * * 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; @@ -130,27 +128,12 @@ static int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry) 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; } } @@ -163,14 +146,14 @@ static int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry) * @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; @@ -207,42 +190,39 @@ int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry, 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} }; @@ -264,10 +244,11 @@ static int ecryptfs_init_global_auth_toks( "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; } @@ -306,18 +287,24 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options) 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; @@ -333,7 +320,7 @@ 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); @@ -341,16 +328,6 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options) } 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; @@ -359,10 +336,7 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options) 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: @@ -372,11 +346,6 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options) &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: @@ -393,11 +362,55 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options) 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) { @@ -408,38 +421,63 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options) 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; } @@ -511,31 +549,26 @@ out: */ 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; } @@ -553,8 +586,8 @@ out: * 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, @@ -581,9 +614,8 @@ static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags, } 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; } @@ -614,7 +646,7 @@ static struct file_system_type ecryptfs_fs_type = { * 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; @@ -625,7 +657,7 @@ static struct ecryptfs_cache_info { 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, @@ -654,11 +686,6 @@ static struct ecryptfs_cache_info { .size = sizeof(struct ecryptfs_sb_info), }, { - .cache = &ecryptfs_header_cache_0, - .name = "ecryptfs_headers_0", - .size = PAGE_CACHE_SIZE, - }, - { .cache = &ecryptfs_header_cache_1, .name = "ecryptfs_headers_1", .size = PAGE_CACHE_SIZE, @@ -693,6 +720,11 @@ static struct ecryptfs_cache_info { .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) @@ -809,21 +841,34 @@ static int __init ecryptfs_init(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: @@ -842,7 +887,8 @@ static void __exit ecryptfs_exit(void) 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();