/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sd-path.h" #include "acl-util.h" #include "alloc-util.h" #include "btrfs-util.h" #include "build.h" #include "capability-util.h" #include "chase.h" #include "chattr-util.h" #include "conf-files.h" #include "constants.h" #include "copy.h" #include "creds-util.h" #include "devnum-util.h" #include "dirent-util.h" #include "dissect-image.h" #include "env-util.h" #include "errno-util.h" #include "escape.h" #include "fd-util.h" #include "fileio.h" #include "format-util.h" #include "fs-util.h" #include "glob-util.h" #include "hexdecoct.h" #include "io-util.h" #include "label-util.h" #include "log.h" #include "macro.h" #include "main-func.h" #include "missing_stat.h" #include "missing_syscall.h" #include "mkdir-label.h" #include "mount-util.h" #include "mountpoint-util.h" #include "nulstr-util.h" #include "offline-passwd.h" #include "pager.h" #include "parse-argument.h" #include "parse-util.h" #include "path-lookup.h" #include "path-util.h" #include "pretty-print.h" #include "rlimit-util.h" #include "rm-rf.h" #include "selinux-util.h" #include "set.h" #include "sort-util.h" #include "specifier.h" #include "stdio-util.h" #include "string-table.h" #include "string-util.h" #include "strv.h" #include "terminal-util.h" #include "umask-util.h" #include "user-util.h" #include "virt.h" /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates * them in the file system. This is intended to be used to create * properly owned directories beneath /tmp, /var/tmp, /run, which are * volatile and hence need to be recreated on bootup. */ typedef enum OperationMask { OPERATION_CREATE = 1 << 0, OPERATION_REMOVE = 1 << 1, OPERATION_CLEAN = 1 << 2, } OperationMask; typedef enum ItemType { /* These ones take file names */ CREATE_FILE = 'f', TRUNCATE_FILE = 'F', /* deprecated: use f+ */ CREATE_DIRECTORY = 'd', TRUNCATE_DIRECTORY = 'D', CREATE_SUBVOLUME = 'v', CREATE_SUBVOLUME_INHERIT_QUOTA = 'q', CREATE_SUBVOLUME_NEW_QUOTA = 'Q', CREATE_FIFO = 'p', CREATE_SYMLINK = 'L', CREATE_CHAR_DEVICE = 'c', CREATE_BLOCK_DEVICE = 'b', COPY_FILES = 'C', /* These ones take globs */ WRITE_FILE = 'w', EMPTY_DIRECTORY = 'e', SET_XATTR = 't', RECURSIVE_SET_XATTR = 'T', SET_ACL = 'a', RECURSIVE_SET_ACL = 'A', SET_ATTRIBUTE = 'h', RECURSIVE_SET_ATTRIBUTE = 'H', IGNORE_PATH = 'x', IGNORE_DIRECTORY_PATH = 'X', REMOVE_PATH = 'r', RECURSIVE_REMOVE_PATH = 'R', RELABEL_PATH = 'z', RECURSIVE_RELABEL_PATH = 'Z', ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */ } ItemType; typedef enum AgeBy { AGE_BY_ATIME = 1 << 0, AGE_BY_BTIME = 1 << 1, AGE_BY_CTIME = 1 << 2, AGE_BY_MTIME = 1 << 3, /* All file timestamp types are checked by default. */ AGE_BY_DEFAULT_FILE = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_CTIME | AGE_BY_MTIME, AGE_BY_DEFAULT_DIR = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_MTIME, } AgeBy; typedef struct Item { ItemType type; char *path; char *argument; void *binary_argument; /* set if binary data, in which case it takes precedence over 'argument' */ size_t binary_argument_size; char **xattrs; #if HAVE_ACL acl_t acl_access; acl_t acl_access_exec; acl_t acl_default; #endif uid_t uid; gid_t gid; mode_t mode; usec_t age; AgeBy age_by_file, age_by_dir; dev_t major_minor; unsigned attribute_value; unsigned attribute_mask; bool uid_set:1; bool gid_set:1; bool mode_set:1; bool uid_only_create:1; bool gid_only_create:1; bool mode_only_create:1; bool age_set:1; bool mask_perms:1; bool attribute_set:1; bool keep_first_level:1; bool append_or_force:1; bool allow_failure:1; bool try_replace:1; OperationMask done; } Item; typedef struct ItemArray { Item *items; size_t n_items; struct ItemArray *parent; Set *children; } ItemArray; typedef enum DirectoryType { DIRECTORY_RUNTIME, DIRECTORY_STATE, DIRECTORY_CACHE, DIRECTORY_LOGS, _DIRECTORY_TYPE_MAX, } DirectoryType; typedef enum { CREATION_NORMAL, CREATION_EXISTING, CREATION_FORCE, _CREATION_MODE_MAX, _CREATION_MODE_INVALID = -EINVAL, } CreationMode; static CatFlags arg_cat_flags = CAT_CONFIG_OFF; static RuntimeScope arg_runtime_scope = RUNTIME_SCOPE_SYSTEM; static OperationMask arg_operation = 0; static bool arg_boot = false; static bool arg_graceful = false; static PagerFlags arg_pager_flags = 0; static char **arg_include_prefixes = NULL; static char **arg_exclude_prefixes = NULL; static char *arg_root = NULL; static char *arg_image = NULL; static char *arg_replace = NULL; static ImagePolicy *arg_image_policy = NULL; #define MAX_DEPTH 256 typedef struct Context { OrderedHashmap *items, *globs; Set *unix_sockets; } Context; STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep); STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep); STATIC_DESTRUCTOR_REGISTER(arg_root, freep); STATIC_DESTRUCTOR_REGISTER(arg_image, freep); STATIC_DESTRUCTOR_REGISTER(arg_image_policy, image_policy_freep); static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = { [CREATION_NORMAL] = "Created", [CREATION_EXISTING] = "Found existing", [CREATION_FORCE] = "Created replacement", }; DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode); static void context_done(Context *c) { assert(c); ordered_hashmap_free(c->items); ordered_hashmap_free(c->globs); set_free(c->unix_sockets); } /* Different kinds of errors that mean that information is not available in the environment. */ static bool ERRNO_IS_NEG_NOINFO(intmax_t r) { return IN_SET(r, -EUNATCH, /* os-release or machine-id missing */ -ENOMEDIUM, /* machine-id or another file empty */ -ENOPKG, /* machine-id is uninitialized */ -ENXIO); /* env var is unset */ } static int specifier_directory(char specifier, const void *data, const char *root, const void *userdata, char **ret) { struct table_entry { uint64_t type; const char *suffix; }; static const struct table_entry paths_system[] = { [DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME }, [DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE }, [DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE }, [DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS }, }; static const struct table_entry paths_user[] = { [DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME }, [DIRECTORY_STATE] = { SD_PATH_USER_STATE_PRIVATE }, [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE }, [DIRECTORY_LOGS] = { SD_PATH_USER_STATE_PRIVATE, "log" }, }; const struct table_entry *paths; _cleanup_free_ char *p = NULL; unsigned i; int r; assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user)); paths = arg_runtime_scope == RUNTIME_SCOPE_USER ? paths_user : paths_system; i = PTR_TO_UINT(data); assert(i < ELEMENTSOF(paths_system)); r = sd_path_lookup(paths[i].type, paths[i].suffix, &p); if (r < 0) return r; if (arg_root) { _cleanup_free_ char *j = NULL; j = path_join(arg_root, p); if (!j) return -ENOMEM; *ret = TAKE_PTR(j); } else *ret = TAKE_PTR(p); return 0; } static int log_unresolvable_specifier(const char *filename, unsigned line) { static bool notified = false; /* In system mode, this is called when /etc is not fully initialized and some specifiers are * unresolvable. In user mode, this is called when some variables are not defined. These cases are * not considered a fatal error, so log at LOG_NOTICE only for the first time and then downgrade this * to LOG_DEBUG for the rest. * * If we're running in a chroot (--root was used or sd_booted() reports that systemd is not running), * always use LOG_DEBUG. We may be called to initialize a chroot before booting and there is no * expectation that machine-id and other files will be populated. */ int log_level = notified || arg_root || running_in_chroot() > 0 ? LOG_DEBUG : LOG_NOTICE; log_syntax(NULL, log_level, filename, line, 0, "Failed to resolve specifier: %s, skipping.", arg_runtime_scope == RUNTIME_SCOPE_USER ? "Required $XDG_... variable not defined" : "uninitialized /etc/ detected"); if (!notified) log_full(log_level, "All rules containing unresolvable specifiers will be skipped."); notified = true; return 0; } static int user_config_paths(char*** ret) { _cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL; _cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL; _cleanup_strv_free_ char **res = NULL; int r; r = xdg_user_dirs(&config_dirs, &data_dirs); if (r < 0) return r; r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d"); if (r < 0 && !ERRNO_IS_NEG_NOINFO(r)) return r; r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d"); if (r < 0 && !ERRNO_IS_NEG_NOINFO(r)) return r; r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d"); if (r < 0 && !ERRNO_IS_NEG_NOINFO(r)) return r; r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d"); if (r < 0) return r; r = strv_extend(&res, persistent_config); if (r < 0) return r; r = strv_extend(&res, runtime_config); if (r < 0) return r; r = strv_extend(&res, data_home); if (r < 0) return r; r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d"); if (r < 0) return r; r = path_strv_make_absolute_cwd(res); if (r < 0) return r; *ret = TAKE_PTR(res); return 0; } static bool needs_glob(ItemType t) { return IN_SET(t, WRITE_FILE, IGNORE_PATH, IGNORE_DIRECTORY_PATH, REMOVE_PATH, RECURSIVE_REMOVE_PATH, EMPTY_DIRECTORY, ADJUST_MODE, RELABEL_PATH, RECURSIVE_RELABEL_PATH, SET_XATTR, RECURSIVE_SET_XATTR, SET_ACL, RECURSIVE_SET_ACL, SET_ATTRIBUTE, RECURSIVE_SET_ATTRIBUTE); } static bool takes_ownership(ItemType t) { return IN_SET(t, CREATE_FILE, TRUNCATE_FILE, CREATE_DIRECTORY, EMPTY_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_FIFO, CREATE_SYMLINK, CREATE_CHAR_DEVICE, CREATE_BLOCK_DEVICE, COPY_FILES, WRITE_FILE, IGNORE_PATH, IGNORE_DIRECTORY_PATH, REMOVE_PATH, RECURSIVE_REMOVE_PATH); } static struct Item* find_glob(OrderedHashmap *h, const char *match) { ItemArray *j; ORDERED_HASHMAP_FOREACH(j, h) { size_t n; for (n = 0; n < j->n_items; n++) { Item *item = j->items + n; if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0) return item; } } return NULL; } static int load_unix_sockets(Context *c) { _cleanup_set_free_ Set *sockets = NULL; _cleanup_fclose_ FILE *f = NULL; int r; if (c->unix_sockets) return 0; /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */ f = fopen("/proc/net/unix", "re"); if (!f) return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to open /proc/net/unix, ignoring: %m"); /* Skip header */ r = read_line(f, LONG_LINE_MAX, NULL); if (r < 0) return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m"); if (r == 0) return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix."); for (;;) { _cleanup_free_ char *line = NULL; char *p; r = read_line(f, LONG_LINE_MAX, &line); if (r < 0) return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m"); if (r == 0) /* EOF */ break; p = strchr(line, ':'); if (!p) continue; if (strlen(p) < 37) continue; p += 37; p += strspn(p, WHITESPACE); p += strcspn(p, WHITESPACE); /* skip one more word */ p += strspn(p, WHITESPACE); if (!path_is_absolute(p)) continue; r = set_put_strdup_full(&sockets, &path_hash_ops_free, p); if (r < 0) return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m"); } c->unix_sockets = TAKE_PTR(sockets); return 1; } static bool unix_socket_alive(Context *c, const char *fn) { assert(c); assert(fn); if (load_unix_sockets(c) < 0) return true; /* We don't know, so assume yes */ return set_contains(c->unix_sockets, fn); } /* Accessors for the argument in binary format */ static const void* item_binary_argument(const Item *i) { assert(i); return i->binary_argument ?: i->argument; } static size_t item_binary_argument_size(const Item *i) { assert(i); return i->binary_argument ? i->binary_argument_size : strlen_ptr(i->argument); } static DIR* xopendirat_nomod(int dirfd, const char *path) { DIR *dir; dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME); if (dir) return dir; if (!IN_SET(errno, ENOENT, ELOOP)) log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path); if (errno != EPERM) return NULL; dir = xopendirat(dirfd, path, O_NOFOLLOW); if (!dir) log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path); return dir; } static DIR* opendir_nomod(const char *path) { return xopendirat_nomod(AT_FDCWD, path); } static nsec_t load_statx_timestamp_nsec(const struct statx_timestamp *ts) { assert(ts); if (ts->tv_sec < 0) return NSEC_INFINITY; if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC) return NSEC_INFINITY; return ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec; } static bool needs_cleanup( nsec_t atime, nsec_t btime, nsec_t ctime, nsec_t mtime, nsec_t cutoff, const char *sub_path, AgeBy age_by, bool is_dir) { if (FLAGS_SET(age_by, AGE_BY_MTIME) && mtime != NSEC_INFINITY && mtime >= cutoff) { /* Follows spelling in stat(1). */ log_debug("%s \"%s\": modify time %s is too new.", is_dir ? "Directory" : "File", sub_path, FORMAT_TIMESTAMP_STYLE(mtime / NSEC_PER_USEC, TIMESTAMP_US)); return false; } if (FLAGS_SET(age_by, AGE_BY_ATIME) && atime != NSEC_INFINITY && atime >= cutoff) { log_debug("%s \"%s\": access time %s is too new.", is_dir ? "Directory" : "File", sub_path, FORMAT_TIMESTAMP_STYLE(atime / NSEC_PER_USEC, TIMESTAMP_US)); return false; } /* * Note: Unless explicitly specified by the user, "ctime" is ignored * by default for directories, because we change it when deleting. */ if (FLAGS_SET(age_by, AGE_BY_CTIME) && ctime != NSEC_INFINITY && ctime >= cutoff) { log_debug("%s \"%s\": change time %s is too new.", is_dir ? "Directory" : "File", sub_path, FORMAT_TIMESTAMP_STYLE(ctime / NSEC_PER_USEC, TIMESTAMP_US)); return false; } if (FLAGS_SET(age_by, AGE_BY_BTIME) && btime != NSEC_INFINITY && btime >= cutoff) { log_debug("%s \"%s\": birth time %s is too new.", is_dir ? "Directory" : "File", sub_path, FORMAT_TIMESTAMP_STYLE(btime / NSEC_PER_USEC, TIMESTAMP_US)); return false; } return true; } static int dir_cleanup( Context *c, Item *i, const char *p, DIR *d, nsec_t self_atime_nsec, nsec_t self_mtime_nsec, nsec_t cutoff_nsec, dev_t rootdev_major, dev_t rootdev_minor, bool mountpoint, int maxdepth, bool keep_this_level, AgeBy age_by_file, AgeBy age_by_dir) { bool deleted = false; int r = 0; assert(c); assert(i); assert(d); FOREACH_DIRENT_ALL(de, d, break) { _cleanup_free_ char *sub_path = NULL; nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec; if (dot_or_dot_dot(de->d_name)) continue; /* If statx() is supported, use it. It's preferable over fstatat() since it tells us * explicitly where we are looking at a mount point, for free as side information. Determining * the same information without statx() is hard, see the complexity of path_is_mount_point(), * and also much slower as it requires a number of syscalls instead of just one. Hence, when * we have modern statx() we use it instead of fstat() and do proper mount point checks, * while on older kernels's well do traditional st_dev based detection of mount points. * * Using statx() for detecting mount points also has the benefit that we handle weird file * systems such as overlayfs better where each file is originating from a different * st_dev. */ STRUCT_STATX_DEFINE(sx); r = statx_fallback( dirfd(d), de->d_name, AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT, STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME, &sx); if (r == -ENOENT) continue; if (r < 0) { /* FUSE, NFS mounts, SELinux might return EACCES */ r = log_full_errno(r == -EACCES ? LOG_DEBUG : LOG_ERR, r, "statx(%s/%s) failed: %m", p, de->d_name); continue; } if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) { /* Yay, we have the mount point API, use it */ if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) { log_debug("Ignoring \"%s/%s\": different mount points.", p, de->d_name); continue; } } else { /* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall * back to traditional stx_dev checking. */ if (sx.stx_dev_major != rootdev_major || sx.stx_dev_minor != rootdev_minor) { log_debug("Ignoring \"%s/%s\": different filesystem.", p, de->d_name); continue; } /* Try to detect bind mounts of the same filesystem instance; they do not differ in device * major/minors. This type of query is not supported on all kernels or filesystem types * though. */ if (S_ISDIR(sx.stx_mode)) { int q; q = fd_is_mount_point(dirfd(d), de->d_name, 0); if (q < 0) log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, de->d_name); else if (q > 0) { log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, de->d_name); continue; } } } atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? load_statx_timestamp_nsec(&sx.stx_atime) : 0; mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? load_statx_timestamp_nsec(&sx.stx_mtime) : 0; ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? load_statx_timestamp_nsec(&sx.stx_ctime) : 0; btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? load_statx_timestamp_nsec(&sx.stx_btime) : 0; sub_path = path_join(p, de->d_name); if (!sub_path) { r = log_oom(); goto finish; } /* Is there an item configured for this path? */ if (ordered_hashmap_get(c->items, sub_path)) { log_debug("Ignoring \"%s\": a separate entry exists.", sub_path); continue; } if (find_glob(c->globs, sub_path)) { log_debug("Ignoring \"%s\": a separate glob exists.", sub_path); continue; } if (S_ISDIR(sx.stx_mode)) { _cleanup_closedir_ DIR *sub_dir = NULL; if (mountpoint && streq(de->d_name, "lost+found") && sx.stx_uid == 0) { log_debug("Ignoring directory \"%s\".", sub_path); continue; } if (maxdepth <= 0) log_warning("Reached max depth on \"%s\".", sub_path); else { int q; sub_dir = xopendirat_nomod(dirfd(d), de->d_name); if (!sub_dir) { if (errno != ENOENT) r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path); continue; } if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) { log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", sub_path); continue; } q = dir_cleanup(c, i, sub_path, sub_dir, atime_nsec, mtime_nsec, cutoff_nsec, rootdev_major, rootdev_minor, false, maxdepth-1, false, age_by_file, age_by_dir); if (q < 0) r = q; } /* Note: if you are wondering why we don't support the sticky bit for excluding * directories from cleaning like we do it for other file system objects: well, the * sticky bit already has a meaning for directories, so we don't want to overload * that. */ if (keep_this_level) { log_debug("Keeping directory \"%s\".", sub_path); continue; } /* * Check the file timestamps of an entry against the * given cutoff time; delete if it is older. */ if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec, cutoff_nsec, sub_path, age_by_dir, true)) continue; log_debug("Removing directory \"%s\".", sub_path); if (unlinkat(dirfd(d), de->d_name, AT_REMOVEDIR) < 0) if (!IN_SET(errno, ENOENT, ENOTEMPTY)) r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path); } else { _cleanup_close_ int fd = -EBADF; /* Skip files for which the sticky bit is set. These are semantics we define, and are * unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */ if (sx.stx_mode & S_ISVTX) { log_debug("Skipping \"%s\": sticky bit set.", sub_path); continue; } if (mountpoint && S_ISREG(sx.stx_mode) && sx.stx_uid == 0 && STR_IN_SET(de->d_name, ".journal", "aquota.user", "aquota.group")) { log_debug("Skipping \"%s\".", sub_path); continue; } /* Ignore sockets that are listed in /proc/net/unix */ if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(c, sub_path)) { log_debug("Skipping \"%s\": live socket.", sub_path); continue; } /* Ignore device nodes */ if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) { log_debug("Skipping \"%s\": a device.", sub_path); continue; } /* Keep files on this level around if this is requested */ if (keep_this_level) { log_debug("Keeping \"%s\".", sub_path); continue; } if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec, cutoff_nsec, sub_path, age_by_file, false)) continue; fd = xopenat_full(dirfd(d), de->d_name, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME|O_NONBLOCK, /* xopen_flags = */ 0, /* mode = */ 0); if (fd < 0 && !IN_SET(fd, -ENOENT, -ELOOP)) log_warning_errno(fd, "Opening file \"%s\" failed, ignoring: %m", sub_path); if (fd >= 0 && flock(fd, LOCK_EX|LOCK_NB) < 0 && errno == EAGAIN) { log_debug_errno(errno, "Couldn't acquire shared BSD lock on file \"%s\", skipping: %m", sub_path); continue; } log_debug("Removing \"%s\".", sub_path); if (unlinkat(dirfd(d), de->d_name, 0) < 0) if (errno != ENOENT) r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path); deleted = true; } } finish: if (deleted) { struct timespec ts[2]; log_debug("Restoring access and modification time on \"%s\": %s, %s", p, FORMAT_TIMESTAMP_STYLE(self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US), FORMAT_TIMESTAMP_STYLE(self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US)); timespec_store_nsec(ts + 0, self_atime_nsec); timespec_store_nsec(ts + 1, self_mtime_nsec); /* Restore original directory timestamps */ if (futimens(dirfd(d), ts) < 0) log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p); } return r; } static bool dangerous_hardlinks(void) { _cleanup_free_ char *value = NULL; static int cached = -1; int r; /* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's * what the upstream default is. */ if (cached >= 0) return cached; r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value); if (r < 0) { log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m"); return true; } r = parse_boolean(value); if (r < 0) { log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m"); return true; } cached = r == 0; return cached; } static bool hardlink_vulnerable(const struct stat *st) { assert(st); return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks(); } static mode_t process_mask_perms(mode_t mode, mode_t current) { if ((current & 0111) == 0) mode &= ~0111; if ((current & 0222) == 0) mode &= ~0222; if ((current & 0444) == 0) mode &= ~0444; if (!S_ISDIR(current)) mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */ return mode; } static int fd_set_perms( Context *c, Item *i, int fd, const char *path, const struct stat *st, CreationMode creation) { bool do_chown, do_chmod; struct stat stbuf; mode_t new_mode; uid_t new_uid; gid_t new_gid; int r; assert(c); assert(i); assert(fd >= 0); assert(path); if (!i->mode_set && !i->uid_set && !i->gid_set) goto shortcut; if (!st) { if (fstat(fd, &stbuf) < 0) return log_error_errno(errno, "fstat(%s) failed: %m", path); st = &stbuf; } if (hardlink_vulnerable(st)) return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path); new_uid = i->uid_set && (creation != CREATION_EXISTING || !i->uid_only_create) ? i->uid : st->st_uid; new_gid = i->gid_set && (creation != CREATION_EXISTING || !i->gid_only_create) ? i->gid : st->st_gid; /* Do we need a chown()? */ do_chown = (new_uid != st->st_uid) || (new_gid != st->st_gid); /* Calculate the mode to apply */ new_mode = i->mode_set && (creation != CREATION_EXISTING || !i->mode_only_create) ? (i->mask_perms ? process_mask_perms(i->mode, st->st_mode) : i->mode) : (st->st_mode & 07777); do_chmod = ((new_mode ^ st->st_mode) & 07777) != 0; if (do_chmod && do_chown) { /* Before we issue the chmod() let's reduce the access mode to the common bits of the old and * the new mode. That way there's no time window where the file exists under the old owner * with more than the old access modes — and not under the new owner with more than the new * access modes either. */ if (S_ISLNK(st->st_mode)) log_debug("Skipping temporary mode fix for symlink %s.", path); else { mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */ if (((m ^ st->st_mode) & 07777) == 0) log_debug("\"%s\" matches temporary mode %o already.", path, m); else { log_debug("Temporarily changing \"%s\" to mode %o.", path, m); r = fchmod_opath(fd, m); if (r < 0) return log_error_errno(r, "fchmod() of %s failed: %m", path); } } } if (do_chown) { log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT, path, new_uid, new_gid); if (fchownat(fd, "", new_uid != st->st_uid ? new_uid : UID_INVALID, new_gid != st->st_gid ? new_gid : GID_INVALID, AT_EMPTY_PATH) < 0) return log_error_errno(errno, "fchownat() of %s failed: %m", path); } /* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a * chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */ if (do_chmod || do_chown) { if (S_ISLNK(st->st_mode)) log_debug("Skipping mode fix for symlink %s.", path); else { log_debug("Changing \"%s\" to mode %o.", path, new_mode); r = fchmod_opath(fd, new_mode); if (r < 0) return log_error_errno(r, "fchmod() of %s failed: %m", path); } } shortcut: return label_fix_full(fd, /* inode_path= */ NULL, /* label_path= */ path, 0); } static int path_open_parent_safe(const char *path, bool allow_failure) { _cleanup_free_ char *dn = NULL; int r, fd; if (!path_is_normalized(path)) return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR, SYNTHETIC_ERRNO(EINVAL), "Failed to open parent of '%s': path not normalized%s.", path, allow_failure ? ", ignoring" : ""); r = path_extract_directory(path, &dn); if (r < 0) return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR, r, "Unable to determine parent directory of '%s'%s: %m", path, allow_failure ? ", ignoring" : ""); r = chase(dn, arg_root, allow_failure ? CHASE_SAFE : CHASE_SAFE|CHASE_WARN, NULL, &fd); if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */ return r; if (r < 0) return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR, r, "Failed to open path '%s'%s: %m", dn, allow_failure ? ", ignoring" : ""); return fd; } static int path_open_safe(const char *path) { int r, fd; /* path_open_safe() returns a file descriptor opened with O_PATH after * verifying that the path doesn't contain unsafe transitions, except * for its final component as the function does not follow symlink. */ assert(path); if (!path_is_normalized(path)) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to open invalid path '%s'.", path); r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd); if (r == -ENOLINK) return r; /* Unsafe symlink: already covered by CHASE_WARN */ if (r < 0) return log_error_errno(r, "Failed to open path %s: %m", path); return fd; } static int path_set_perms( Context *c, Item *i, const char *path, CreationMode creation) { _cleanup_close_ int fd = -EBADF; assert(c); assert(i); assert(path); fd = path_open_safe(path); if (fd < 0) return fd; return fd_set_perms(c, i, fd, path, /* st= */ NULL, creation); } static int parse_xattrs_from_arg(Item *i) { const char *p; int r; assert(i); assert_se(p = i->argument); for (;;) { _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL; r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE); if (r < 0) log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p); if (r <= 0) break; r = split_pair(xattr, "=", &name, &value); if (r < 0) { log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr); continue; } if (isempty(name) || isempty(value)) { log_warning("Malformed extended attribute found, ignoring: %s", xattr); continue; } if (strv_push_pair(&i->xattrs, name, value) < 0) return log_oom(); name = value = NULL; } return 0; } static int fd_set_xattrs( Context *c, Item *i, int fd, const char *path, const struct stat *st, CreationMode creation) { assert(c); assert(i); assert(fd >= 0); assert(path); STRV_FOREACH_PAIR(name, value, i->xattrs) { log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path); if (setxattr(FORMAT_PROC_FD_PATH(fd), *name, *value, strlen(*value), 0) < 0) return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m", *name, *value, path); } return 0; } static int path_set_xattrs( Context *c, Item *i, const char *path, CreationMode creation) { _cleanup_close_ int fd = -EBADF; assert(c); assert(i); assert(path); fd = path_open_safe(path); if (fd < 0) return fd; return fd_set_xattrs(c, i, fd, path, /* st = */ NULL, creation); } static int parse_acls_from_arg(Item *item) { #if HAVE_ACL int r; assert(item); /* If append_or_force (= modify) is set, we will not modify the acl * afterwards, so the mask can be added now if necessary. */ r = parse_acl(item->argument, &item->acl_access, &item->acl_access_exec, &item->acl_default, !item->append_or_force); if (r < 0) log_full_errno(arg_graceful && IN_SET(r, -EINVAL, -ENOENT, -ESRCH) ? LOG_DEBUG : LOG_WARNING, r, "Failed to parse ACL \"%s\", ignoring: %m", item->argument); #else log_warning("ACLs are not supported, ignoring."); #endif return 0; } #if HAVE_ACL static int parse_acl_cond_exec( const char *path, const struct stat *st, acl_t cond_exec, acl_t access, /* could be empty (NULL) */ bool append, acl_t *ret) { acl_entry_t entry; acl_permset_t permset; bool has_exec; int r; assert(path); assert(st); assert(cond_exec); assert(ret); if (!S_ISDIR(st->st_mode)) { _cleanup_(acl_freep) acl_t old = NULL; old = acl_get_file(path, ACL_TYPE_ACCESS); if (!old) return -errno; has_exec = false; for (r = acl_get_entry(old, ACL_FIRST_ENTRY, &entry); r > 0; r = acl_get_entry(old, ACL_NEXT_ENTRY, &entry)) { acl_tag_t tag; if (acl_get_tag_type(entry, &tag) < 0) return -errno; if (tag == ACL_MASK) continue; /* If not appending, skip ACL definitions */ if (!append && IN_SET(tag, ACL_USER, ACL_GROUP)) continue; if (acl_get_permset(entry, &permset) < 0) return -errno; r = acl_get_perm(permset, ACL_EXECUTE); if (r < 0) return -errno; if (r > 0) { has_exec = true; break; } } if (r < 0) return -errno; /* Check if we're about to set the execute bit in acl_access */ if (!has_exec && access) { for (r = acl_get_entry(access, ACL_FIRST_ENTRY, &entry); r > 0; r = acl_get_entry(access, ACL_NEXT_ENTRY, &entry)) { if (acl_get_permset(entry, &permset) < 0) return -errno; r = acl_get_perm(permset, ACL_EXECUTE); if (r < 0) return -errno; if (r > 0) { has_exec = true; break; } } if (r < 0) return -errno; } } else has_exec = true; _cleanup_(acl_freep) acl_t parsed = access ? acl_dup(access) : acl_init(0); if (!parsed) return -errno; for (r = acl_get_entry(cond_exec, ACL_FIRST_ENTRY, &entry); r > 0; r = acl_get_entry(cond_exec, ACL_NEXT_ENTRY, &entry)) { acl_entry_t parsed_entry; if (acl_create_entry(&parsed, &parsed_entry) < 0) return -errno; if (acl_copy_entry(parsed_entry, entry) < 0) return -errno; /* We substituted 'X' with 'x' in parse_acl(), so drop execute bit here if not applicable. */ if (!has_exec) { if (acl_get_permset(parsed_entry, &permset) < 0) return -errno; if (acl_delete_perm(permset, ACL_EXECUTE) < 0) return -errno; } } if (r < 0) return -errno; if (!append) { /* want_mask = true */ r = calc_acl_mask_if_needed(&parsed); if (r < 0) return r; } *ret = TAKE_PTR(parsed); return 0; } static int path_set_acl( Context *c, const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) { _cleanup_(acl_free_charpp) char *t = NULL; _cleanup_(acl_freep) acl_t dup = NULL; int r; assert(c); /* Returns 0 for success, positive error if already warned, negative error otherwise. */ if (modify) { r = acls_for_file(path, type, acl, &dup); if (r < 0) return r; r = calc_acl_mask_if_needed(&dup); if (r < 0) return r; } else { dup = acl_dup(acl); if (!dup) return -errno; /* the mask was already added earlier if needed */ } r = add_base_acls_if_needed(&dup, path); if (r < 0) return r; t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE); log_debug("Setting %s ACL %s on %s.", type == ACL_TYPE_ACCESS ? "access" : "default", strna(t), pretty); r = acl_set_file(path, type, dup); if (r < 0) { if (ERRNO_IS_NOT_SUPPORTED(errno)) /* No error if filesystem doesn't support ACLs. Return negative. */ return -errno; else /* Return positive to indicate we already warned */ return -log_error_errno(errno, "Setting %s ACL \"%s\" on %s failed: %m", type == ACL_TYPE_ACCESS ? "access" : "default", strna(t), pretty); } return 0; } #endif static int fd_set_acls( Context *c, Item *item, int fd, const char *path, const struct stat *st, CreationMode creation) { int r = 0; #if HAVE_ACL _cleanup_(acl_freep) acl_t access_with_exec_parsed = NULL; struct stat stbuf; assert(c); assert(item); assert(fd >= 0); assert(path); if (!st) { if (fstat(fd, &stbuf) < 0) return log_error_errno(errno, "fstat(%s) failed: %m", path); st = &stbuf; } if (hardlink_vulnerable(st)) return log_error_errno(SYNTHETIC_ERRNO(EPERM), "Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path); if (S_ISLNK(st->st_mode)) { log_debug("Skipping ACL fix for symlink %s.", path); return 0; } if (item->acl_access_exec) { r = parse_acl_cond_exec(FORMAT_PROC_FD_PATH(fd), st, item->acl_access_exec, item->acl_access, item->append_or_force, &access_with_exec_parsed); if (r < 0) return log_error_errno(r, "Failed to parse conditionalized execute bit for \"%s\": %m", path); r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, access_with_exec_parsed, item->append_or_force); } else if (item->acl_access) r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force); /* set only default acls to folders */ if (r == 0 && item->acl_default && S_ISDIR(st->st_mode)) r = path_set_acl(c, FORMAT_PROC_FD_PATH(fd), path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force); if (ERRNO_IS_NOT_SUPPORTED(r)) { log_debug_errno(r, "ACLs not supported by file system at %s", path); return 0; } if (r > 0) return -r; /* already warned in path_set_acl */ /* The above procfs paths don't work if /proc is not mounted. */ if (r == -ENOENT && proc_mounted() == 0) r = -ENOSYS; if (r < 0) return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path); #endif return r; } static int path_set_acls( Context *c, Item *item, const char *path, CreationMode creation) { int r = 0; #if HAVE_ACL _cleanup_close_ int fd = -EBADF; assert(c); assert(item); assert(path); fd = path_open_safe(path); if (fd < 0) return fd; r = fd_set_acls(c, item, fd, path, /* st= */ NULL, creation); #endif return r; } static int parse_attribute_from_arg(Item *item) { static const struct { char character; unsigned value; } attributes[] = { { 'A', FS_NOATIME_FL }, /* do not update atime */ { 'S', FS_SYNC_FL }, /* Synchronous updates */ { 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */ { 'a', FS_APPEND_FL }, /* writes to file may only append */ { 'c', FS_COMPR_FL }, /* Compress file */ { 'd', FS_NODUMP_FL }, /* do not dump file */ { 'e', FS_EXTENT_FL }, /* Extents */ { 'i', FS_IMMUTABLE_FL }, /* Immutable file */ { 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */ { 's', FS_SECRM_FL }, /* Secure deletion */ { 'u', FS_UNRM_FL }, /* Undelete */ { 't', FS_NOTAIL_FL }, /* file tail should not be merged */ { 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */ { 'C', FS_NOCOW_FL }, /* Do not cow file */ { 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */ }; enum { MODE_ADD, MODE_DEL, MODE_SET } mode = MODE_ADD; unsigned value = 0, mask = 0; const char *p; assert(item); p = item->argument; if (p) { if (*p == '+') { mode = MODE_ADD; p++; } else if (*p == '-') { mode = MODE_DEL; p++; } else if (*p == '=') { mode = MODE_SET; p++; } } if (isempty(p) && mode != MODE_SET) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Setting file attribute on '%s' needs an attribute specification.", item->path); for (; p && *p ; p++) { unsigned i, v; for (i = 0; i < ELEMENTSOF(attributes); i++) if (*p == attributes[i].character) break; if (i >= ELEMENTSOF(attributes)) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown file attribute '%c' on '%s'.", *p, item->path); v = attributes[i].value; SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET)); mask |= v; } if (mode == MODE_SET) mask |= CHATTR_ALL_FL; assert(mask != 0); item->attribute_mask = mask; item->attribute_value = value; item->attribute_set = true; return 0; } static int fd_set_attribute( Context *c, Item *item, int fd, const char *path, const struct stat *st, CreationMode creation) { _cleanup_close_ int procfs_fd = -EBADF; struct stat stbuf; unsigned f; int r; assert(c); assert(item); assert(fd >= 0); assert(path); if (!item->attribute_set || item->attribute_mask == 0) return 0; if (!st) { if (fstat(fd, &stbuf) < 0) return log_error_errno(errno, "fstat(%s) failed: %m", path); st = &stbuf; } /* Issuing the file attribute ioctls on device nodes is not safe, as that will be delivered to the * drivers, not the file system containing the device node. */ if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode)) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Setting file flags is only supported on regular files and directories, cannot set on '%s'.", path); f = item->attribute_value & item->attribute_mask; /* Mask away directory-specific flags */ if (!S_ISDIR(st->st_mode)) f &= ~FS_DIRSYNC_FL; procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME); if (procfs_fd < 0) return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path); unsigned previous, current; r = chattr_full(procfs_fd, NULL, f, item->attribute_mask, &previous, ¤t, CHATTR_FALLBACK_BITWISE); if (r == -ENOANO) log_warning("Cannot set file attributes for '%s', maybe due to incompatibility in specified attributes, " "previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.", path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask)); else if (r < 0) log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r, "Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m", path, item->attribute_value, item->attribute_mask); return 0; } static int path_set_attribute( Context *c, Item *item, const char *path, CreationMode creation) { _cleanup_close_ int fd = -EBADF; assert(c); assert(item); if (!item->attribute_set || item->attribute_mask == 0) return 0; fd = path_open_safe(path); if (fd < 0) return fd; return fd_set_attribute(c, item, fd, path, /* st= */ NULL, creation); } static int write_argument_data(Item *i, int fd, const char *path) { int r; assert(i); assert(fd >= 0); assert(path); if (item_binary_argument_size(i) == 0) return 0; assert(item_binary_argument(i)); log_debug("Writing to \"%s\".", path); r = loop_write(fd, item_binary_argument(i), item_binary_argument_size(i)); if (r < 0) return log_error_errno(r, "Failed to write file \"%s\": %m", path); return 0; } static int write_one_file(Context *c, Item *i, const char *path, CreationMode creation) { _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF; _cleanup_free_ char *bn = NULL; int r; assert(c); assert(i); assert(path); assert(i->type == WRITE_FILE); r = path_extract_filename(path, &bn); if (r < 0) return log_error_errno(r, "Failed to extract filename from path '%s': %m", path); if (r == O_DIRECTORY) return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path); /* Validate the path and keep the fd on the directory for opening the file so we're sure that it * can't be changed behind our back. */ dir_fd = path_open_parent_safe(path, i->allow_failure); if (dir_fd < 0) return dir_fd; /* Follows symlinks */ fd = openat(dir_fd, bn, O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0), i->mode); if (fd < 0) { if (errno == ENOENT) { log_debug_errno(errno, "Not writing missing file \"%s\": %m", path); return 0; } if (i->allow_failure) return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path); return log_error_errno(errno, "Failed to open file \"%s\": %m", path); } /* 'w' is allowed to write into any kind of files. */ r = write_argument_data(i, fd, path); if (r < 0) return r; return fd_set_perms(c, i, fd, path, NULL, creation); } static int create_file( Context *c, Item *i, const char *path) { _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF; _cleanup_free_ char *bn = NULL; struct stat stbuf, *st = NULL; CreationMode creation; int r = 0; assert(c); assert(i); assert(path); assert(i->type == CREATE_FILE); /* 'f' operates on regular files exclusively. */ r = path_extract_filename(path, &bn); if (r < 0) return log_error_errno(r, "Failed to extract filename from path '%s': %m", path); if (r == O_DIRECTORY) return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for writing, is a directory.", path); /* Validate the path and keep the fd on the directory for opening the file so we're sure that it * can't be changed behind our back. */ dir_fd = path_open_parent_safe(path, i->allow_failure); if (dir_fd < 0) return dir_fd; WITH_UMASK(0000) { mac_selinux_create_file_prepare(path, S_IFREG); fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode)); mac_selinux_create_file_clear(); } if (fd < 0) { /* Even on a read-only filesystem, open(2) returns EEXIST if the file already exists. It * returns EROFS only if it needs to create the file. */ if (fd != -EEXIST) return log_error_errno(fd, "Failed to create file %s: %m", path); /* Re-open the file. At that point it must exist since open(2) failed with EEXIST. We still * need to check if the perms/mode need to be changed. For read-only filesystems, we let * fd_set_perms() report the error if the perms need to be modified. */ fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode); if (fd < 0) return log_error_errno(errno, "Failed to re-open file %s: %m", path); if (fstat(fd, &stbuf) < 0) return log_error_errno(errno, "stat(%s) failed: %m", path); if (!S_ISREG(stbuf.st_mode)) return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "%s exists and is not a regular file.", path); st = &stbuf; creation = CREATION_EXISTING; } else { r = write_argument_data(i, fd, path); if (r < 0) return r; creation = CREATION_NORMAL; } return fd_set_perms(c, i, fd, path, st, creation); } static int truncate_file( Context *c, Item *i, const char *path) { _cleanup_close_ int fd = -EBADF, dir_fd = -EBADF; _cleanup_free_ char *bn = NULL; struct stat stbuf, *st = NULL; CreationMode creation; bool erofs = false; int r = 0; assert(c); assert(i); assert(path); assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force)); /* We want to operate on regular file exclusively especially since O_TRUNC is unspecified if the file * is neither a regular file nor a fifo nor a terminal device. Therefore we first open the file and * make sure it's a regular one before truncating it. */ r = path_extract_filename(path, &bn); if (r < 0) return log_error_errno(r, "Failed to extract filename from path '%s': %m", path); if (r == O_DIRECTORY) return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for truncation, is a directory.", path); /* Validate the path and keep the fd on the directory for opening the file so we're sure that it * can't be changed behind our back. */ dir_fd = path_open_parent_safe(path, i->allow_failure); if (dir_fd < 0) return dir_fd; creation = CREATION_EXISTING; fd = RET_NERRNO(openat(dir_fd, bn, O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode)); if (fd == -ENOENT) { creation = CREATION_NORMAL; /* Didn't work without O_CREATE, try again with */ WITH_UMASK(0000) { mac_selinux_create_file_prepare(path, S_IFREG); fd = RET_NERRNO(openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode)); mac_selinux_create_file_clear(); } } if (fd < 0) { if (fd != -EROFS) return log_error_errno(fd, "Failed to open/create file %s: %m", path); /* On a read-only filesystem, we don't want to fail if the target is already empty and the * perms are set. So we still proceed with the sanity checks and let the remaining operations * fail with EROFS if they try to modify the target file. */ fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode); if (fd < 0) { if (errno == ENOENT) return log_error_errno(SYNTHETIC_ERRNO(EROFS), "Cannot create file %s on a read-only file system.", path); return log_error_errno(errno, "Failed to re-open file %s: %m", path); } erofs = true; creation = CREATION_EXISTING; } if (fstat(fd, &stbuf) < 0) return log_error_errno(errno, "stat(%s) failed: %m", path); if (!S_ISREG(stbuf.st_mode)) return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "%s exists and is not a regular file.", path); if (stbuf.st_size > 0) { if (ftruncate(fd, 0) < 0) { r = erofs ? -EROFS : -errno; return log_error_errno(r, "Failed to truncate file %s: %m", path); } } else st = &stbuf; log_debug("\"%s\" has been created.", path); if (item_binary_argument(i)) { r = write_argument_data(i, fd, path); if (r < 0) return r; } return fd_set_perms(c, i, fd, path, st, creation); } static int copy_files(Context *c, Item *i) { _cleanup_close_ int dfd = -EBADF, fd = -EBADF; _cleanup_free_ char *bn = NULL; struct stat st, a; int r; log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path); r = path_extract_filename(i->path, &bn); if (r < 0) return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path); /* Validate the path and use the returned directory fd for copying the target so we're sure that the * path can't be changed behind our back. */ dfd = path_open_parent_safe(i->path, i->allow_failure); if (dfd < 0) return dfd; r = copy_tree_at(AT_FDCWD, i->argument, dfd, bn, i->uid_set ? i->uid : UID_INVALID, i->gid_set ? i->gid : GID_INVALID, COPY_REFLINK | ((i->append_or_force) ? COPY_MERGE : COPY_MERGE_EMPTY) | COPY_MAC_CREATE | COPY_HARDLINKS, NULL, NULL); fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (fd < 0) { if (r < 0) /* Look at original error first */ return log_error_errno(r, "Failed to copy files to %s: %m", i->path); return log_error_errno(errno, "Failed to openat(%s): %m", i->path); } if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat(%s): %m", i->path); if (stat(i->argument, &a) < 0) return log_error_errno(errno, "Failed to stat(%s): %m", i->argument); if (((st.st_mode ^ a.st_mode) & S_IFMT) != 0) { log_debug("Can't copy to %s, file exists already and is of different type", i->path); return 0; } return fd_set_perms(c, i, fd, i->path, &st, _CREATION_MODE_INVALID); } static int create_directory_or_subvolume( const char *path, mode_t mode, bool subvol, bool allow_failure, struct stat *ret_st, CreationMode *ret_creation) { _cleanup_free_ char *bn = NULL; _cleanup_close_ int pfd = -EBADF; CreationMode creation; struct stat st; int r, fd; assert(path); r = path_extract_filename(path, &bn); if (r < 0) return log_error_errno(r, "Failed to extract filename from path '%s': %m", path); pfd = path_open_parent_safe(path, allow_failure); if (pfd < 0) return pfd; if (subvol) { r = getenv_bool("SYSTEMD_TMPFILES_FORCE_SUBVOL"); if (r < 0) { if (r != -ENXIO) /* env var is unset */ log_warning_errno(r, "Cannot parse value of $SYSTEMD_TMPFILES_FORCE_SUBVOL, ignoring."); r = btrfs_is_subvol(empty_to_root(arg_root)) > 0; } if (r == 0) /* Don't create a subvolume unless the root directory is one, too. We do this under * the assumption that if the root directory is just a plain directory (i.e. very * light-weight), we shouldn't try to split it up into subvolumes (i.e. more * heavy-weight). Thus, chroot() environments and suchlike will get a full brtfs * subvolume set up below their tree only if they specifically set up a btrfs * subvolume for the root dir too. */ subvol = false; else { WITH_UMASK((~mode) & 0777) r = btrfs_subvol_make(pfd, bn); } } else r = 0; if (!subvol || ERRNO_IS_NEG_NOT_SUPPORTED(r)) WITH_UMASK(0000) r = mkdirat_label(pfd, bn, mode); creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING; fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_DIRECTORY|O_PATH); if (fd < 0) { /* We couldn't open it because it is not actually a directory? */ if (errno == ENOTDIR) return log_error_errno(SYNTHETIC_ERRNO(EEXIST), "\"%s\" already exists and is not a directory.", path); /* Then look at the original error */ if (r < 0) return log_full_errno(allow_failure ? LOG_INFO : LOG_ERR, r, "Failed to create directory or subvolume \"%s\"%s: %m", path, allow_failure ? ", ignoring" : ""); return log_error_errno(errno, "Failed to open directory/subvolume we just created '%s': %m", path); } if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat(%s): %m", path); assert(S_ISDIR(st.st_mode)); /* we used O_DIRECTORY above */ log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), path); if (ret_st) *ret_st = st; if (ret_creation) *ret_creation = creation; return fd; } static int create_directory( Context *c, Item *i, const char *path) { _cleanup_close_ int fd = -EBADF; CreationMode creation; struct stat st; assert(c); assert(i); assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY)); fd = create_directory_or_subvolume(path, i->mode, /* subvol= */ false, i->allow_failure, &st, &creation); if (fd == -EEXIST) return 0; if (fd < 0) return fd; return fd_set_perms(c, i, fd, path, &st, creation); } static int create_subvolume( Context *c, Item *i, const char *path) { _cleanup_close_ int fd = -EBADF; CreationMode creation; struct stat st; int r, q = 0; assert(c); assert(i); assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)); fd = create_directory_or_subvolume(path, i->mode, /* subvol = */ true, i->allow_failure, &st, &creation); if (fd == -EEXIST) return 0; if (fd < 0) return fd; if (creation == CREATION_NORMAL && IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) { r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA); if (r == -ENOTTY) log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path); else if (r == -EROFS) log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path); else if (r == -ENOTCONN) log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path); else if (r < 0) q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path); else if (r > 0) log_debug("Adjusted quota for subvolume \"%s\".", i->path); else if (r == 0) log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path); } r = fd_set_perms(c, i, fd, path, &st, creation); if (q < 0) /* prefer the quota change error from above */ return q; return r; } static int empty_directory( Context *c, Item *i, const char *path, CreationMode creation) { _cleanup_close_ int fd = -EBADF; struct stat st; int r; assert(c); assert(i); assert(i->type == EMPTY_DIRECTORY); r = chase(path, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd); if (r == -ENOLINK) /* Unsafe symlink: already covered by CHASE_WARN */ return r; if (r == -ENOENT) { /* Option "e" operates only on existing objects. Do not print errors about non-existent files * or directories */ log_debug_errno(r, "Skipping missing directory: %s", path); return 0; } if (r < 0) return log_error_errno(r, "Failed to open directory '%s': %m", path); if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat(%s): %m", path); if (!S_ISDIR(st.st_mode)) { log_warning("'%s' already exists and is not a directory.", path); return 0; } return fd_set_perms(c, i, fd, path, &st, creation); } static int create_device( Context *c, Item *i, mode_t file_type) { _cleanup_close_ int dfd = -EBADF, fd = -EBADF; _cleanup_free_ char *bn = NULL; CreationMode creation; struct stat st; int r; assert(c); assert(i); assert(IN_SET(i->type, CREATE_BLOCK_DEVICE, CREATE_CHAR_DEVICE)); assert(IN_SET(file_type, S_IFBLK, S_IFCHR)); r = path_extract_filename(i->path, &bn); if (r < 0) return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path); if (r == O_DIRECTORY) return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating device node, is a directory.", i->path); /* Validate the path and use the returned directory fd for copying the target so we're sure that the * path can't be changed behind our back. */ dfd = path_open_parent_safe(i->path, i->allow_failure); if (dfd < 0) return dfd; WITH_UMASK(0000) { mac_selinux_create_file_prepare(i->path, file_type); r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor)); mac_selinux_create_file_clear(); } creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING; /* Try to open the inode via O_PATH, regardless if we could create it or not. Maybe everything is in * order anyway and we hence can ignore the error to create the device node */ fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (fd < 0) { /* OK, so opening the inode failed, let's look at the original error then. */ if (r < 0) { if (ERRNO_IS_PRIVILEGE(r)) goto handle_privilege; return log_error_errno(r, "Failed to create device node '%s': %m", i->path); } return log_error_errno(errno, "Failed to open device node '%s' we just created: %m", i->path); } if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat(%s): %m", i->path); if (((st.st_mode ^ file_type) & S_IFMT) != 0) { if (i->append_or_force) { fd = safe_close(fd); WITH_UMASK(0000) { mac_selinux_create_file_prepare(i->path, file_type); r = mknodat_atomic(dfd, bn, i->mode | file_type, i->major_minor); mac_selinux_create_file_clear(); } if (ERRNO_IS_PRIVILEGE(r)) goto handle_privilege; if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) { r = rm_rf_child(dfd, bn, REMOVE_PHYSICAL); if (r < 0) return log_error_errno(r, "rm -rf %s failed: %m", i->path); mac_selinux_create_file_prepare(i->path, file_type); r = RET_NERRNO(mknodat(dfd, bn, i->mode | file_type, i->major_minor)); mac_selinux_create_file_clear(); } if (r < 0) return log_error_errno(r, "Failed to create device node '%s': %m", i->path); fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (fd < 0) return log_error_errno(errno, "Failed to open device node we just created '%s': %m", i->path); /* Validate type before change ownership below */ if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat(%s): %m", i->path); if (((st.st_mode ^ file_type) & S_IFMT) != 0) return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Device node we just created is not a device node, refusing."); creation = CREATION_FORCE; } else { log_warning("\"%s\" already exists and is not a device node.", i->path); return 0; } } log_debug("%s %s device node \"%s\" %u:%u.", creation_mode_verb_to_string(creation), i->type == CREATE_BLOCK_DEVICE ? "block" : "char", i->path, major(i->mode), minor(i->mode)); return fd_set_perms(c, i, fd, i->path, &st, creation); handle_privilege: log_debug_errno(r, "We lack permissions, possibly because of cgroup configuration; " "skipping creation of device node '%s'.", i->path); return 0; } static int create_fifo(Context *c, Item *i) { _cleanup_close_ int pfd = -EBADF, fd = -EBADF; _cleanup_free_ char *bn = NULL; CreationMode creation; struct stat st; int r; assert(c); assert(i); assert(i->type == CREATE_FIFO); r = path_extract_filename(i->path, &bn); if (r < 0) return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path); if (r == O_DIRECTORY) return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating FIFO, is a directory.", i->path); pfd = path_open_parent_safe(i->path, i->allow_failure); if (pfd < 0) return pfd; WITH_UMASK(0000) { mac_selinux_create_file_prepare(i->path, S_IFIFO); r = RET_NERRNO(mkfifoat(pfd, bn, i->mode)); mac_selinux_create_file_clear(); } creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING; /* Open the inode via O_PATH, regardless if we managed to create it or not. Maybe it is already the FIFO we want */ fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (fd < 0) { if (r < 0) return log_error_errno(r, "Failed to create FIFO %s: %m", i->path); /* original error! */ return log_error_errno(errno, "Failed to open FIFO we just created %s: %m", i->path); } if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat(%s): %m", i->path); if (!S_ISFIFO(st.st_mode)) { if (i->append_or_force) { fd = safe_close(fd); WITH_UMASK(0000) { mac_selinux_create_file_prepare(i->path, S_IFIFO); r = mkfifoat_atomic(pfd, bn, i->mode); mac_selinux_create_file_clear(); } if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) { r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL); if (r < 0) return log_error_errno(r, "rm -rf %s failed: %m", i->path); mac_selinux_create_file_prepare(i->path, S_IFIFO); r = RET_NERRNO(mkfifoat(pfd, bn, i->mode)); mac_selinux_create_file_clear(); } if (r < 0) return log_error_errno(r, "Failed to create FIFO %s: %m", i->path); fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (fd < 0) return log_error_errno(errno, "Failed to open FIFO we just created '%s': %m", i->path); /* Validate type before change ownership below */ if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat(%s): %m", i->path); if (!S_ISFIFO(st.st_mode)) return log_error_errno(SYNTHETIC_ERRNO(EBADF), "FIFO inode we just created is not a FIFO, refusing."); creation = CREATION_FORCE; } else { log_warning("\"%s\" already exists and is not a FIFO.", i->path); return 0; } } log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), i->path); return fd_set_perms(c, i, fd, i->path, &st, creation); } static int create_symlink(Context *c, Item *i) { _cleanup_close_ int pfd = -EBADF, fd = -EBADF; _cleanup_free_ char *bn = NULL; CreationMode creation; struct stat st; bool good = false; int r; assert(c); assert(i); r = path_extract_filename(i->path, &bn); if (r < 0) return log_error_errno(r, "Failed to extract filename from path '%s': %m", i->path); if (r == O_DIRECTORY) return log_error_errno(SYNTHETIC_ERRNO(EISDIR), "Cannot open path '%s' for creating symlink, is a directory.", i->path); pfd = path_open_parent_safe(i->path, i->allow_failure); if (pfd < 0) return pfd; mac_selinux_create_file_prepare(i->path, S_IFLNK); r = RET_NERRNO(symlinkat(i->argument, pfd, bn)); mac_selinux_create_file_clear(); creation = r >= 0 ? CREATION_NORMAL : CREATION_EXISTING; fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (fd < 0) { if (r < 0) return log_error_errno(r, "Failed to create symlink '%s': %m", i->path); /* original error! */ return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path); } if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat(%s): %m", i->path); if (S_ISLNK(st.st_mode)) { _cleanup_free_ char *x = NULL; r = readlinkat_malloc(fd, "", &x); if (r < 0) return log_error_errno(r, "readlinkat(%s) failed: %m", i->path); good = streq(x, i->argument); } else good = false; if (!good) { if (!i->append_or_force) { log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path); return 0; } fd = safe_close(fd); mac_selinux_create_file_prepare(i->path, S_IFLNK); r = symlinkat_atomic_full(i->argument, pfd, bn, /* make_relative= */ false); mac_selinux_create_file_clear(); if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) { r = rm_rf_child(pfd, bn, REMOVE_PHYSICAL); if (r < 0) return log_error_errno(r, "rm -rf %s failed: %m", i->path); mac_selinux_create_file_prepare(i->path, S_IFLNK); r = RET_NERRNO(symlinkat(i->argument, pfd, i->path)); mac_selinux_create_file_clear(); } if (r < 0) return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path); fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (fd < 0) return log_error_errno(errno, "Failed to open symlink we just created '%s': %m", i->path); /* Validate type before change ownership below */ if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat(%s): %m", i->path); if (!S_ISLNK(st.st_mode)) return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Symlink we just created is not a symlink, refusing."); creation = CREATION_FORCE; } log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path); return fd_set_perms(c, i, fd, i->path, &st, creation); } typedef int (*action_t)(Context *c, Item *i, const char *path, CreationMode creation); typedef int (*fdaction_t)(Context *c, Item *i, int fd, const char *path, const struct stat *st, CreationMode creation); static int item_do( Context *c, Item *i, int fd, const char *path, CreationMode creation, fdaction_t action) { struct stat st; int r = 0, q = 0; assert(c); assert(i); assert(path); assert(fd >= 0); if (fstat(fd, &st) < 0) { r = log_error_errno(errno, "fstat() on file failed: %m"); goto finish; } /* This returns the first error we run into, but nevertheless tries to go on */ r = action(c, i, fd, path, &st, creation); if (S_ISDIR(st.st_mode)) { _cleanup_closedir_ DIR *d = NULL; /* The passed 'fd' was opened with O_PATH. We need to convert it into a 'regular' fd before * reading the directory content. */ d = opendir(FORMAT_PROC_FD_PATH(fd)); if (!d) { log_error_errno(errno, "Failed to opendir() '%s': %m", FORMAT_PROC_FD_PATH(fd)); if (r == 0) r = -errno; goto finish; } FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) { int de_fd; if (dot_or_dot_dot(de->d_name)) continue; de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (de_fd < 0) { if (errno != ENOENT) q = log_error_errno(errno, "Failed to open file '%s': %m", de->d_name); } else { _cleanup_free_ char *de_path = NULL; de_path = path_join(path, de->d_name); if (!de_path) q = log_oom(); else /* Pass ownership of dirent fd over */ q = item_do(c, i, de_fd, de_path, CREATION_EXISTING, action); } if (q < 0 && r == 0) r = q; } } finish: safe_close(fd); return r; } static int glob_item(Context *c, Item *i, action_t action) { _cleanup_globfree_ glob_t g = { .gl_opendir = (void *(*)(const char *)) opendir_nomod, }; int r = 0, k; assert(c); assert(i); k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g); if (k < 0 && k != -ENOENT) return log_error_errno(k, "glob(%s) failed: %m", i->path); STRV_FOREACH(fn, g.gl_pathv) { /* We pass CREATION_EXISTING here, since if we are globbing for it, it always has to exist */ k = action(c, i, *fn, CREATION_EXISTING); if (k < 0 && r == 0) r = k; } return r; } static int glob_item_recursively( Context *c, Item *i, fdaction_t action) { _cleanup_globfree_ glob_t g = { .gl_opendir = (void *(*)(const char *)) opendir_nomod, }; int r = 0, k; k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g); if (k < 0 && k != -ENOENT) return log_error_errno(k, "glob(%s) failed: %m", i->path); STRV_FOREACH(fn, g.gl_pathv) { _cleanup_close_ int fd = -EBADF; /* Make sure we won't trigger/follow file object (such as * device nodes, automounts, ...) pointed out by 'fn' with * O_PATH. Note, when O_PATH is used, flags other than * O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */ fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH); if (fd < 0) { log_error_errno(errno, "Opening '%s' failed: %m", *fn); if (r == 0) r = -errno; continue; } k = item_do(c, i, fd, *fn, CREATION_EXISTING, action); if (k < 0 && r == 0) r = k; /* we passed fd ownership to the previous call */ fd = -EBADF; } return r; } static int rm_if_wrong_type_safe( mode_t mode, int parent_fd, const struct stat *parent_st, /* Only used if follow_links below is true. */ const char *name, int flags) { _cleanup_free_ char *parent_name = NULL; bool follow_links = !FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW); struct stat st; int r; assert(name); assert((mode & ~S_IFMT) == 0); assert(!follow_links || parent_st); assert((flags & ~AT_SYMLINK_NOFOLLOW) == 0); if (!filename_is_valid(name)) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a valid filename.", name); r = fstatat_harder(parent_fd, name, &st, flags, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE); if (r < 0) { (void) fd_get_path(parent_fd, &parent_name); return log_full_errno(r == -ENOENT? LOG_DEBUG : LOG_ERR, r, "Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name)); } /* Fail before removing anything if this is an unsafe transition. */ if (follow_links && unsafe_transition(parent_st, &st)) { (void) fd_get_path(parent_fd, &parent_name); return log_error_errno(SYNTHETIC_ERRNO(ENOLINK), "Unsafe transition from \"%s\" to \"%s\".", parent_name, name); } if ((st.st_mode & S_IFMT) == mode) return 0; (void) fd_get_path(parent_fd, &parent_name); log_notice("Wrong file type 0o%o; rm -rf \"%s/%s\"", st.st_mode & S_IFMT, strna(parent_name), name); /* If the target of the symlink was the wrong type, the link needs to be removed instead of the * target, so make sure it is identified as a link and not a directory. */ if (follow_links) { r = fstatat_harder(parent_fd, name, &st, AT_SYMLINK_NOFOLLOW, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE); if (r < 0) return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name)); } /* Do not remove mount points. */ r = fd_is_mount_point(parent_fd, name, follow_links ? AT_SYMLINK_FOLLOW : 0); if (r < 0) (void) log_warning_errno(r, "Failed to check if \"%s/%s\" is a mount point: %m; Continuing", strna(parent_name), name); else if (r > 0) return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Not removing \"%s/%s\" because it is a mount point.", strna(parent_name), name); if ((st.st_mode & S_IFMT) == S_IFDIR) { _cleanup_close_ int child_fd = -EBADF; child_fd = openat(parent_fd, name, O_NOCTTY | O_CLOEXEC | O_DIRECTORY); if (child_fd < 0) return log_error_errno(errno, "Failed to open \"%s\" at \"%s\": %m", name, strna(parent_name)); r = rm_rf_children(TAKE_FD(child_fd), REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL, &st); if (r < 0) return log_error_errno(r, "Failed to remove contents of \"%s\" at \"%s\": %m", name, strna(parent_name)); r = unlinkat_harder(parent_fd, name, AT_REMOVEDIR, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE); } else r = unlinkat_harder(parent_fd, name, 0, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE); if (r < 0) return log_error_errno(r, "Failed to remove \"%s\" at \"%s\": %m", name, strna(parent_name)); /* This is covered by the log_notice "Wrong file type..." It is logged earlier because it gives * context to other error messages that might follow. */ return -ENOENT; } /* If child_mode is non-zero, rm_if_wrong_type_safe will be executed for the last path component. */ static int mkdir_parents_rm_if_wrong_type(mode_t child_mode, const char *path) { _cleanup_close_ int parent_fd = -EBADF; struct stat parent_st; size_t path_len; int r; assert(path); assert((child_mode & ~S_IFMT) == 0); path_len = strlen(path); if (!is_path(path)) /* rm_if_wrong_type_safe already logs errors. */ return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, AT_FDCWD, NULL, path, AT_SYMLINK_NOFOLLOW) : 0; if (child_mode != 0 && endswith(path, "/")) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Trailing path separators are only allowed if child_mode is not set; got \"%s\"", path); /* Get the parent_fd and stat. */ parent_fd = openat(AT_FDCWD, path_is_absolute(path) ? "/" : ".", O_NOCTTY | O_CLOEXEC | O_DIRECTORY); if (parent_fd < 0) return log_error_errno(errno, "Failed to open root: %m"); if (fstat(parent_fd, &parent_st) < 0) return log_error_errno(errno, "Failed to stat root: %m"); /* Check every parent directory in the path, except the last component */ for (const char *e = path;;) { _cleanup_close_ int next_fd = -EBADF; char t[path_len + 1]; const char *s; /* Find the start of the next path component. */ s = e + strspn(e, "/"); /* Find the end of the next path component. */ e = s + strcspn(s, "/"); /* Copy the path component to t so it can be a null terminated string. */ *((char*) mempcpy(t, s, e - s)) = 0; /* Is this the last component? If so, then check the type */ if (*e == 0) return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW) : 0; r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, 0); /* Remove dangling symlinks. */ if (r == -ENOENT) r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW); if (r == -ENOENT) { WITH_UMASK(0000) r = mkdirat_label(parent_fd, t, 0755); if (r < 0) { _cleanup_free_ char *parent_name = NULL; (void) fd_get_path(parent_fd, &parent_name); return log_error_errno(r, "Failed to mkdir \"%s\" at \"%s\": %m", t, strnull(parent_name)); } } else if (r < 0) /* rm_if_wrong_type_safe already logs errors. */ return r; next_fd = RET_NERRNO(openat(parent_fd, t, O_NOCTTY | O_CLOEXEC | O_DIRECTORY)); if (next_fd < 0) { _cleanup_free_ char *parent_name = NULL; (void) fd_get_path(parent_fd, &parent_name); return log_error_errno(next_fd, "Failed to open \"%s\" at \"%s\": %m", t, strnull(parent_name)); } r = RET_NERRNO(fstat(next_fd, &parent_st)); if (r < 0) { _cleanup_free_ char *parent_name = NULL; (void) fd_get_path(parent_fd, &parent_name); return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", t, strnull(parent_name)); } close_and_replace(parent_fd, next_fd); } } static int mkdir_parents_item(Item *i, mode_t child_mode) { int r; if (i->try_replace) { r = mkdir_parents_rm_if_wrong_type(child_mode, i->path); if (r < 0 && r != -ENOENT) return r; } else WITH_UMASK(0000) (void) mkdir_parents_label(i->path, 0755); return 0; } static int create_item(Context *c, Item *i) { int r; assert(c); assert(i); log_debug("Running create action for entry %c %s", (char) i->type, i->path); switch (i->type) { case IGNORE_PATH: case IGNORE_DIRECTORY_PATH: case REMOVE_PATH: case RECURSIVE_REMOVE_PATH: return 0; case TRUNCATE_FILE: case CREATE_FILE: r = mkdir_parents_item(i, S_IFREG); if (r < 0) return r; if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE) r = truncate_file(c, i, i->path); else r = create_file(c, i, i->path); if (r < 0) return r; break; case COPY_FILES: r = mkdir_parents_item(i, 0); if (r < 0) return r; r = copy_files(c, i); if (r < 0) return r; break; case WRITE_FILE: r = glob_item(c, i, write_one_file); if (r < 0) return r; break; case CREATE_DIRECTORY: case TRUNCATE_DIRECTORY: r = mkdir_parents_item(i, S_IFDIR); if (r < 0) return r; r = create_directory(c, i, i->path); if (r < 0) return r; break; case CREATE_SUBVOLUME: case CREATE_SUBVOLUME_INHERIT_QUOTA: case CREATE_SUBVOLUME_NEW_QUOTA: r = mkdir_parents_item(i, S_IFDIR); if (r < 0) return r; r = create_subvolume(c, i, i->path); if (r < 0) return r; break; case EMPTY_DIRECTORY: r = glob_item(c, i, empty_directory); if (r < 0) return r; break; case CREATE_FIFO: r = mkdir_parents_item(i, S_IFIFO); if (r < 0) return r; r = create_fifo(c, i); if (r < 0) return r; break; case CREATE_SYMLINK: r = mkdir_parents_item(i, S_IFLNK); if (r < 0) return r; r = create_symlink(c, i); if (r < 0) return r; break; case CREATE_BLOCK_DEVICE: case CREATE_CHAR_DEVICE: if (have_effective_cap(CAP_MKNOD) <= 0) { /* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that * case to avoid noise, and we don't support virtualized devices in containers anyway. */ log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path); return 0; } r = mkdir_parents_item(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR); if (r < 0) return r; r = create_device(c, i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR); if (r < 0) return r; break; case ADJUST_MODE: case RELABEL_PATH: r = glob_item(c, i, path_set_perms); if (r < 0) return r; break; case RECURSIVE_RELABEL_PATH: r = glob_item_recursively(c, i, fd_set_perms); if (r < 0) return r; break; case SET_XATTR: r = glob_item(c, i, path_set_xattrs); if (r < 0) return r; break; case RECURSIVE_SET_XATTR: r = glob_item_recursively(c, i, fd_set_xattrs); if (r < 0) return r; break; case SET_ACL: r = glob_item(c, i, path_set_acls); if (r < 0) return r; break; case RECURSIVE_SET_ACL: r = glob_item_recursively(c, i, fd_set_acls); if (r < 0) return r; break; case SET_ATTRIBUTE: r = glob_item(c, i, path_set_attribute); if (r < 0) return r; break; case RECURSIVE_SET_ATTRIBUTE: r = glob_item_recursively(c, i, fd_set_attribute); if (r < 0) return r; break; } return 0; } static int remove_item_instance( Context *c, Item *i, const char *instance, CreationMode creation) { int r; assert(c); assert(i); switch (i->type) { case REMOVE_PATH: if (remove(instance) < 0 && errno != ENOENT) return log_error_errno(errno, "rm(%s): %m", instance); break; case RECURSIVE_REMOVE_PATH: /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */ log_debug("rm -rf \"%s\"", instance); r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL); if (r < 0 && r != -ENOENT) return log_error_errno(r, "rm_rf(%s): %m", instance); break; default: assert_not_reached(); } return 0; } static int remove_item(Context *c, Item *i) { int r; assert(c); assert(i); log_debug("Running remove action for entry %c %s", (char) i->type, i->path); switch (i->type) { case TRUNCATE_DIRECTORY: /* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */ log_debug("rm -rf \"%s\"", i->path); r = rm_rf(i->path, REMOVE_PHYSICAL); if (r < 0 && r != -ENOENT) return log_error_errno(r, "rm_rf(%s): %m", i->path); return 0; case REMOVE_PATH: case RECURSIVE_REMOVE_PATH: return glob_item(c, i, remove_item_instance); default: return 0; } } static char *age_by_to_string(AgeBy ab, bool is_dir) { static const char ab_map[] = { 'a', 'b', 'c', 'm' }; size_t j = 0; char *ret; ret = new(char, ELEMENTSOF(ab_map) + 1); if (!ret) return NULL; for (size_t i = 0; i < ELEMENTSOF(ab_map); i++) if (FLAGS_SET(ab, 1U << i)) ret[j++] = is_dir ? ascii_toupper(ab_map[i]) : ab_map[i]; ret[j] = 0; return ret; } static int clean_item_instance( Context *c, Item *i, const char* instance, CreationMode creation) { _cleanup_closedir_ DIR *d = NULL; STRUCT_STATX_DEFINE(sx); int mountpoint, r; usec_t cutoff, n; assert(i); if (!i->age_set) return 0; n = now(CLOCK_REALTIME); if (n < i->age) return 0; cutoff = n - i->age; d = opendir_nomod(instance); if (!d) { if (IN_SET(errno, ENOENT, ENOTDIR)) { log_debug_errno(errno, "Directory \"%s\": %m", instance); return 0; } return log_error_errno(errno, "Failed to open directory %s: %m", instance); } r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx); if (r < 0) return log_error_errno(r, "statx(%s) failed: %m", instance); if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT); else { struct stat ps; if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0) return log_error_errno(errno, "stat(%s/..) failed: %m", i->path); mountpoint = sx.stx_dev_major != major(ps.st_dev) || sx.stx_dev_minor != minor(ps.st_dev) || sx.stx_ino != ps.st_ino; } if (DEBUG_LOGGING) { _cleanup_free_ char *ab_f = NULL, *ab_d = NULL; ab_f = age_by_to_string(i->age_by_file, false); if (!ab_f) return log_oom(); ab_d = age_by_to_string(i->age_by_dir, true); if (!ab_d) return log_oom(); log_debug("Cleanup threshold for %s \"%s\" is %s; age-by: %s%s", mountpoint ? "mount point" : "directory", instance, FORMAT_TIMESTAMP_STYLE(cutoff, TIMESTAMP_US), ab_f, ab_d); } return dir_cleanup(c, i, instance, d, load_statx_timestamp_nsec(&sx.stx_atime), load_statx_timestamp_nsec(&sx.stx_mtime), cutoff * NSEC_PER_USEC, sx.stx_dev_major, sx.stx_dev_minor, mountpoint, MAX_DEPTH, i->keep_first_level, i->age_by_file, i->age_by_dir); } static int clean_item(Context *c, Item *i) { assert(c); assert(i); log_debug("Running clean action for entry %c %s", (char) i->type, i->path); switch (i->type) { case CREATE_DIRECTORY: case CREATE_SUBVOLUME: case CREATE_SUBVOLUME_INHERIT_QUOTA: case CREATE_SUBVOLUME_NEW_QUOTA: case TRUNCATE_DIRECTORY: case IGNORE_PATH: case COPY_FILES: clean_item_instance(c, i, i->path, CREATION_EXISTING); return 0; case EMPTY_DIRECTORY: case IGNORE_DIRECTORY_PATH: return glob_item(c, i, clean_item_instance); default: return 0; } } static int process_item( Context *c, Item *i, OperationMask operation) { OperationMask todo; _cleanup_free_ char *_path = NULL; const char *path; int r, q, p; assert(c); assert(i); todo = operation & ~i->done; if (todo == 0) /* Everything already done? */ return 0; i->done |= operation; path = i->path; if (string_is_glob(path)) { /* We can't easily check whether a glob matches any autofs path, so let's do the check only * for the non-glob part. */ r = glob_non_glob_prefix(path, &_path); if (r < 0 && r != -ENOENT) return log_debug_errno(r, "Failed to deglob path: %m"); if (r >= 0) path = _path; } r = chase(path, arg_root, CHASE_NO_AUTOFS|CHASE_NONEXISTENT|CHASE_WARN, NULL, NULL); if (r == -EREMOTE) { log_notice_errno(r, "Skipping %s", i->path); /* We log the configured path, to not confuse the user. */ return 0; } if (r < 0) log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path); r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(c, i) : 0; /* Failure can only be tolerated for create */ if (i->allow_failure) r = 0; q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(c, i) : 0; p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(c, i) : 0; return r < 0 ? r : q < 0 ? q : p; } static int process_item_array( Context *c, ItemArray *array, OperationMask operation) { int r = 0; size_t n; assert(c); assert(array); /* Create any parent first. */ if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent) r = process_item_array(c, array->parent, operation & OPERATION_CREATE); /* Clean up all children first */ if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) { ItemArray *cc; SET_FOREACH(cc, array->children) { int k; k = process_item_array(c, cc, operation & (OPERATION_REMOVE|OPERATION_CLEAN)); if (k < 0 && r == 0) r = k; } } for (n = 0; n < array->n_items; n++) { int k; k = process_item(c, array->items + n, operation); if (k < 0 && r == 0) r = k; } return r; } static void item_free_contents(Item *i) { assert(i); free(i->path); free(i->argument); free(i->binary_argument); strv_free(i->xattrs); #if HAVE_ACL if (i->acl_access) acl_free(i->acl_access); if (i->acl_access_exec) acl_free(i->acl_access_exec); if (i->acl_default) acl_free(i->acl_default); #endif } static ItemArray* item_array_free(ItemArray *a) { size_t n; if (!a) return NULL; for (n = 0; n < a->n_items; n++) item_free_contents(a->items + n); set_free(a->children); free(a->items); return mfree(a); } static int item_compare(const Item *a, const Item *b) { /* Make sure that the ownership taking item is put first, so * that we first create the node, and then can adjust it */ if (takes_ownership(a->type) && !takes_ownership(b->type)) return -1; if (!takes_ownership(a->type) && takes_ownership(b->type)) return 1; return CMP(a->type, b->type); } static bool item_compatible(const Item *a, const Item *b) { assert(a); assert(b); assert(streq(a->path, b->path)); if (takes_ownership(a->type) && takes_ownership(b->type)) /* check if the items are the same */ return memcmp_nn(item_binary_argument(a), item_binary_argument_size(a), item_binary_argument(b), item_binary_argument_size(b)) == 0 && a->uid_set == b->uid_set && a->uid == b->uid && a->uid_only_create == b->uid_only_create && a->gid_set == b->gid_set && a->gid == b->gid && a->gid_only_create == b->gid_only_create && a->mode_set == b->mode_set && a->mode == b->mode && a->mode_only_create == b->mode_only_create && a->age_set == b->age_set && a->age == b->age && a->age_by_file == b->age_by_file && a->age_by_dir == b->age_by_dir && a->mask_perms == b->mask_perms && a->keep_first_level == b->keep_first_level && a->major_minor == b->major_minor; return true; } static bool should_include_path(const char *path) { STRV_FOREACH(prefix, arg_exclude_prefixes) if (path_startswith(path, *prefix)) { log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.", path, *prefix); return false; } STRV_FOREACH(prefix, arg_include_prefixes) if (path_startswith(path, *prefix)) { log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix); return true; } /* no matches, so we should include this path only if we have no allow list at all */ if (strv_isempty(arg_include_prefixes)) return true; log_debug("Entry \"%s\" does not match any include prefix, skipping.", path); return false; } static int specifier_expansion_from_arg(const Specifier *specifier_table, Item *i) { int r; assert(i); if (!i->argument) return 0; switch (i->type) { case COPY_FILES: case CREATE_SYMLINK: case CREATE_FILE: case TRUNCATE_FILE: case WRITE_FILE: { _cleanup_free_ char *unescaped = NULL, *resolved = NULL; ssize_t l; l = cunescape(i->argument, 0, &unescaped); if (l < 0) return log_error_errno(l, "Failed to unescape parameter to write: %s", i->argument); r = specifier_printf(unescaped, PATH_MAX-1, specifier_table, arg_root, NULL, &resolved); if (r < 0) return r; return free_and_replace(i->argument, resolved); } case SET_XATTR: case RECURSIVE_SET_XATTR: STRV_FOREACH(xattr, i->xattrs) { _cleanup_free_ char *resolved = NULL; r = specifier_printf(*xattr, SIZE_MAX, specifier_table, arg_root, NULL, &resolved); if (r < 0) return r; free_and_replace(*xattr, resolved); } return 0; default: return 0; } } static int patch_var_run(const char *fname, unsigned line, char **path) { const char *k; char *n; assert(path); assert(*path); /* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in * some cases and detects conflicts in others. If files/directories are specified through two equivalent lines * this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks * early, but that's precisely not what we can do here as this code very likely is running very early on, at a * time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules * might create the paths that are intermediary to the listed paths. We can't really cover the generic case, * but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for * /run only, and we explicitly document that and require that on systemd systems the former is a symlink to * the latter. Moreover files below this path are by far the primary use case for tmpfiles.d/. */ k = path_startswith(*path, "/var/run/"); if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */ return 0; n = path_join("/run", k); if (!n) return log_oom(); /* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence * there's no immediate need for action by the user. However, in the interest of making things less confusing * to the user, let's still inform the user that these snippets should really be updated. */ log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.", *path, n); free_and_replace(*path, n); return 0; } static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) { int r; assert(user); assert(ret_uid); /* First: parse as numeric UID string */ r = parse_uid(user, ret_uid); if (r >= 0) return r; /* Second: pass to NSS if we are running "online" */ if (!arg_root) return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0); /* Third, synthesize "root" unconditionally */ if (streq(user, "root")) { *ret_uid = 0; return 0; } /* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */ return name_to_uid_offline(arg_root, user, ret_uid, cache); } static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) { int r; assert(group); assert(ret_gid); /* First: parse as numeric GID string */ r = parse_gid(group, ret_gid); if (r >= 0) return r; /* Second: pass to NSS if we are running "online" */ if (!arg_root) return get_group_creds(&group, ret_gid, 0); /* Third, synthesize "root" unconditionally */ if (streq(group, "root")) { *ret_gid = 0; return 0; } /* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */ return name_to_gid_offline(arg_root, group, ret_gid, cache); } static int parse_age_by_from_arg(const char *age_by_str, Item *item) { AgeBy ab_f = 0, ab_d = 0; static const struct { char age_by_chr; AgeBy age_by_flag; } age_by_types[] = { { 'a', AGE_BY_ATIME }, { 'b', AGE_BY_BTIME }, { 'c', AGE_BY_CTIME }, { 'm', AGE_BY_MTIME }, }; assert(age_by_str); assert(item); if (isempty(age_by_str)) return -EINVAL; for (const char *s = age_by_str; *s != 0; s++) { size_t i; /* Ignore whitespace. */ if (strchr(WHITESPACE, *s)) continue; for (i = 0; i < ELEMENTSOF(age_by_types); i++) { /* Check lower-case for files, upper-case for directories. */ if (*s == age_by_types[i].age_by_chr) { ab_f |= age_by_types[i].age_by_flag; break; } else if (*s == ascii_toupper(age_by_types[i].age_by_chr)) { ab_d |= age_by_types[i].age_by_flag; break; } } /* Invalid character. */ if (i >= ELEMENTSOF(age_by_types)) return -EINVAL; } /* No match. */ if (ab_f == 0 && ab_d == 0) return -EINVAL; item->age_by_file = ab_f > 0 ? ab_f : AGE_BY_DEFAULT_FILE; item->age_by_dir = ab_d > 0 ? ab_d : AGE_BY_DEFAULT_DIR; return 0; } static bool is_duplicated_item(ItemArray *existing, const Item *i) { assert(existing); assert(i); for (size_t n = 0; n < existing->n_items; n++) { const Item *e = existing->items + n; if (item_compatible(e, i)) continue; /* Only multiple 'w+' lines for the same path are allowed. */ if (e->type != WRITE_FILE || !e->append_or_force || i->type != WRITE_FILE || !i->append_or_force) return true; } return false; } static int parse_line( Context *c, const char *fname, unsigned line, const char *buffer, bool *invalid_config, Hashmap **uid_cache, Hashmap **gid_cache) { _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL; _cleanup_(item_free_contents) Item i = { /* The "age-by" argument considers all file timestamp types by default. */ .age_by_file = AGE_BY_DEFAULT_FILE, .age_by_dir = AGE_BY_DEFAULT_DIR, }; ItemArray *existing; OrderedHashmap *h; int r, pos; bool append_or_force = false, boot = false, allow_failure = false, try_replace = false, unbase64 = false, from_cred = false, missing_user_or_group = false; assert(c); assert(fname); assert(line >= 1); assert(buffer); const Specifier specifier_table[] = { { 'a', specifier_architecture, NULL }, { 'b', specifier_boot_id, NULL }, { 'B', specifier_os_build_id, NULL }, { 'H', specifier_hostname, NULL }, { 'l', specifier_short_hostname, NULL }, { 'm', specifier_machine_id, NULL }, { 'o', specifier_os_id, NULL }, { 'v', specifier_kernel_release, NULL }, { 'w', specifier_os_version_id, NULL }, { 'W', specifier_os_variant_id, NULL }, { 'h', specifier_user_home, NULL }, { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) }, { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) }, { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) }, { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) }, COMMON_CREDS_SPECIFIERS(arg_runtime_scope), COMMON_TMP_SPECIFIERS, {} }; r = extract_many_words( &buffer, NULL, EXTRACT_UNQUOTE | EXTRACT_CUNESCAPE, &action, &path, &mode, &user, &group, &age, NULL); if (r < 0) { if (IN_SET(r, -EINVAL, -EBADSLT)) /* invalid quoting and such or an unknown specifier */ *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m"); } else if (r < 2) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error."); } if (!empty_or_dash(buffer)) { i.argument = strdup(buffer); if (!i.argument) return log_oom(); } if (isempty(action)) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action); } for (pos = 1; action[pos]; pos++) { if (action[pos] == '!' && !boot) boot = true; else if (action[pos] == '+' && !append_or_force) append_or_force = true; else if (action[pos] == '-' && !allow_failure) allow_failure = true; else if (action[pos] == '=' && !try_replace) try_replace = true; else if (action[pos] == '~' && !unbase64) unbase64 = true; else if (action[pos] == '^' && !from_cred) from_cred = true; else { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action); } } if (boot && !arg_boot) { log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path); return 0; } i.type = action[0]; i.append_or_force = append_or_force; i.allow_failure = allow_failure; i.try_replace = try_replace; r = specifier_printf(path, PATH_MAX-1, specifier_table, arg_root, NULL, &i.path); if (ERRNO_IS_NEG_NOINFO(r)) return log_unresolvable_specifier(fname, line); if (r < 0) { if (IN_SET(r, -EINVAL, -EBADSLT)) *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path); } r = patch_var_run(fname, line, &i.path); if (r < 0) return r; if (!path_is_absolute(i.path)) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Path '%s' not absolute.", i.path); } path_simplify(i.path); switch (i.type) { case CREATE_DIRECTORY: case CREATE_SUBVOLUME: case CREATE_SUBVOLUME_INHERIT_QUOTA: case CREATE_SUBVOLUME_NEW_QUOTA: case EMPTY_DIRECTORY: case TRUNCATE_DIRECTORY: case CREATE_FIFO: case IGNORE_PATH: case IGNORE_DIRECTORY_PATH: case REMOVE_PATH: case RECURSIVE_REMOVE_PATH: case ADJUST_MODE: case RELABEL_PATH: case RECURSIVE_RELABEL_PATH: if (i.argument) log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", (char) i.type); break; case CREATE_FILE: case TRUNCATE_FILE: break; case CREATE_SYMLINK: if (unbase64) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for symlink targets."); } break; case WRITE_FILE: if (!i.argument) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument."); } break; case COPY_FILES: if (unbase64) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for copy sources."); } break; case CREATE_CHAR_DEVICE: case CREATE_BLOCK_DEVICE: if (unbase64) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for device node creation."); } if (!i.argument) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument."); } r = parse_devnum(i.argument, &i.major_minor); if (r < 0) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument); } break; case SET_XATTR: case RECURSIVE_SET_XATTR: if (unbase64) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for extended attributes."); } if (!i.argument) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Set extended attribute requires argument."); } r = parse_xattrs_from_arg(&i); if (r < 0) return r; break; case SET_ACL: case RECURSIVE_SET_ACL: if (unbase64) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for ACLs."); } if (!i.argument) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Set ACLs requires argument."); } r = parse_acls_from_arg(&i); if (r < 0) return r; break; case SET_ATTRIBUTE: case RECURSIVE_SET_ATTRIBUTE: if (unbase64) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "base64 decoding not supported for file attributes."); } if (!i.argument) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Set file attribute requires argument."); } r = parse_attribute_from_arg(&i); if (IN_SET(r, -EINVAL, -EBADSLT)) *invalid_config = true; if (r < 0) return r; break; default: *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown command type '%c'.", (char) i.type); } if (!should_include_path(i.path)) return 0; if (!unbase64) { /* Do specifier expansion except if base64 mode is enabled */ r = specifier_expansion_from_arg(specifier_table, &i); if (ERRNO_IS_NEG_NOINFO(r)) return log_unresolvable_specifier(fname, line); if (r < 0) { if (IN_SET(r, -EINVAL, -EBADSLT)) *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m"); } } switch (i.type) { case CREATE_SYMLINK: if (!i.argument) { i.argument = path_join("/usr/share/factory", i.path); if (!i.argument) return log_oom(); } break; case COPY_FILES: if (!i.argument) { i.argument = path_join("/usr/share/factory", i.path); if (!i.argument) return log_oom(); } else if (!path_is_absolute(i.argument)) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument); } if (!empty_or_root(arg_root)) { char *p; p = path_join(arg_root, i.argument); if (!p) return log_oom(); free_and_replace(i.argument, p); } path_simplify(i.argument); if (laccess(i.argument, F_OK) == -ENOENT) { /* Silently skip over lines where the source file is missing. */ log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Copy source path '%s' does not exist, skipping line.", i.argument); return 0; } break; default: break; } if (from_cred) { if (!i.argument) return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL), "Reading from credential requested, but no credential name specified."); if (!credential_name_valid(i.argument)) return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EINVAL), "Credential name not valid: %s", i.argument); r = read_credential(i.argument, &i.binary_argument, &i.binary_argument_size); if (IN_SET(r, -ENXIO, -ENOENT)) { /* Silently skip over lines that have no credentials passed */ log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Credential '%s' not specified, skipping line.", i.argument); return 0; } if (r < 0) return log_error_errno(r, "Failed to read credential '%s': %m", i.argument); } /* If base64 decoding is requested, do so now */ if (unbase64 && item_binary_argument(&i)) { _cleanup_free_ void *data = NULL; size_t data_size = 0; r = unbase64mem(item_binary_argument(&i), item_binary_argument_size(&i), &data, &data_size); if (r < 0) return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to base64 decode specified argument '%s': %m", i.argument); free_and_replace(i.binary_argument, data); i.binary_argument_size = data_size; } if (!empty_or_root(arg_root)) { char *p; p = path_join(arg_root, i.path); if (!p) return log_oom(); free_and_replace(i.path, p); } if (!empty_or_dash(user)) { const char *u; u = startswith(user, ":"); if (u) i.uid_only_create = true; else u = user; r = find_uid(u, &i.uid, uid_cache); if (r == -ESRCH && arg_graceful) { log_syntax(NULL, LOG_DEBUG, fname, line, r, "%s: user '%s' not found, not adjusting ownership.", i.path, u); missing_user_or_group = true; } else if (r < 0) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", u); } else i.uid_set = true; } if (!empty_or_dash(group)) { const char *g; g = startswith(group, ":"); if (g) i.gid_only_create = true; else g = group; r = find_gid(g, &i.gid, gid_cache); if (r == -ESRCH && arg_graceful) { log_syntax(NULL, LOG_DEBUG, fname, line, r, "%s: group '%s' not found, not adjusting ownership.", i.path, g); missing_user_or_group = true; } else if (r < 0) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s': %m", g); } else i.gid_set = true; } if (!empty_or_dash(mode)) { const char *mm; unsigned m; for (mm = mode;; mm++) { if (*mm == '~') i.mask_perms = true; else if (*mm == ':') i.mode_only_create = true; else break; } r = parse_mode(mm, &m); if (r < 0) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode); } i.mode = m; i.mode_set = true; } else i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644; if (missing_user_or_group && (i.mode & ~0777) != 0) { /* Refuse any special bits for nodes where we couldn't resolve the ownership properly. */ mode_t adjusted = i.mode & 0777; log_syntax(NULL, LOG_INFO, fname, line, 0, "Changing mode 0%o to 0%o because of changed ownership.", i.mode, adjusted); i.mode = adjusted; } if (!empty_or_dash(age)) { const char *a = age; _cleanup_free_ char *seconds = NULL, *age_by = NULL; if (*a == '~') { i.keep_first_level = true; a++; } /* Format: "age-by:age"; where age-by is "[abcmABCM]+". */ r = split_pair(a, ":", &age_by, &seconds); if (r == -ENOMEM) return log_oom(); if (r < 0 && r != -EINVAL) return log_error_errno(r, "Failed to parse age-by for '%s': %m", age); if (r >= 0) { /* We found a ":", parse the "age-by" part. */ r = parse_age_by_from_arg(age_by, &i); if (r == -ENOMEM) return log_oom(); if (r < 0) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age-by '%s'.", age_by); } /* For parsing the "age" part, after the ":". */ a = seconds; } r = parse_sec(a, &i.age); if (r < 0) { *invalid_config = true; return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", a); } i.age_set = true; } h = needs_glob(i.type) ? c->globs : c->items; existing = ordered_hashmap_get(h, i.path); if (existing) { if (is_duplicated_item(existing, &i)) { log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path); return 0; } } else { existing = new0(ItemArray, 1); if (!existing) return log_oom(); r = ordered_hashmap_put(h, i.path, existing); if (r < 0) { free(existing); return log_oom(); } } if (!GREEDY_REALLOC(existing->items, existing->n_items + 1)) return log_oom(); existing->items[existing->n_items++] = TAKE_STRUCT(i); /* Sort item array, to enforce stable ordering of application */ typesafe_qsort(existing->items, existing->n_items, item_compare); return 0; } static int cat_config(char **config_dirs, char **args) { _cleanup_strv_free_ char **files = NULL; int r; r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL); if (r < 0) return r; pager_open(arg_pager_flags); return cat_files(NULL, files, arg_cat_flags); } static int exclude_default_prefixes(void) { int r; /* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in * combination with --root= where we probably don't want to apply stuff to these dirs as they are * likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have * all kinds of files created/adjusted underneath these mount points. */ r = strv_extend_strv( &arg_exclude_prefixes, STRV_MAKE("/dev", "/proc", "/run", "/sys"), true); if (r < 0) return log_oom(); return 0; } static int help(void) { _cleanup_free_ char *link = NULL; int r; r = terminal_urlify_man("systemd-tmpfiles", "8", &link); if (r < 0) return log_oom(); printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n" "\n%sCreates, deletes and cleans up volatile and temporary files and directories.%s\n\n" " -h --help Show this help\n" " --user Execute user configuration\n" " --version Show package version\n" " --cat-config Show configuration files\n" " --tldr Show non-comment parts of configuration\n" " --create Create marked files/directories\n" " --clean Clean up marked directories\n" " --remove Remove marked files/directories\n" " --boot Execute actions only safe at boot\n" " --graceful Quietly ignore unknown users or groups\n" " --prefix=PATH Only apply rules with the specified prefix\n" " --exclude-prefix=PATH Ignore rules with the specified prefix\n" " -E Ignore rules prefixed with /dev, /proc, /run, /sys\n" " --root=PATH Operate on an alternate filesystem root\n" " --image=PATH Operate on disk image as filesystem root\n" " --image-policy=POLICY Specify disk image dissection policy\n" " --replace=PATH Treat arguments as replacement for PATH\n" " --no-pager Do not pipe output into a pager\n" "\nSee the %s for details.\n", program_invocation_short_name, ansi_highlight(), ansi_normal(), link); return 0; } static int parse_argv(int argc, char *argv[]) { enum { ARG_VERSION = 0x100, ARG_CAT_CONFIG, ARG_TLDR, ARG_USER, ARG_CREATE, ARG_CLEAN, ARG_REMOVE, ARG_BOOT, ARG_GRACEFUL, ARG_PREFIX, ARG_EXCLUDE_PREFIX, ARG_ROOT, ARG_IMAGE, ARG_IMAGE_POLICY, ARG_REPLACE, ARG_NO_PAGER, }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "user", no_argument, NULL, ARG_USER }, { "version", no_argument, NULL, ARG_VERSION }, { "cat-config", no_argument, NULL, ARG_CAT_CONFIG }, { "tldr", no_argument, NULL, ARG_TLDR }, { "create", no_argument, NULL, ARG_CREATE }, { "clean", no_argument, NULL, ARG_CLEAN }, { "remove", no_argument, NULL, ARG_REMOVE }, { "boot", no_argument, NULL, ARG_BOOT }, { "graceful", no_argument, NULL, ARG_GRACEFUL }, { "prefix", required_argument, NULL, ARG_PREFIX }, { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX }, { "root", required_argument, NULL, ARG_ROOT }, { "image", required_argument, NULL, ARG_IMAGE }, { "image-policy", required_argument, NULL, ARG_IMAGE_POLICY }, { "replace", required_argument, NULL, ARG_REPLACE }, { "no-pager", no_argument, NULL, ARG_NO_PAGER }, {} }; int c, r; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0) switch (c) { case 'h': return help(); case ARG_VERSION: return version(); case ARG_CAT_CONFIG: arg_cat_flags = CAT_CONFIG_ON; break; case ARG_TLDR: arg_cat_flags = CAT_TLDR; break; case ARG_USER: arg_runtime_scope = RUNTIME_SCOPE_USER; break; case ARG_CREATE: arg_operation |= OPERATION_CREATE; break; case ARG_CLEAN: arg_operation |= OPERATION_CLEAN; break; case ARG_REMOVE: arg_operation |= OPERATION_REMOVE; break; case ARG_BOOT: arg_boot = true; break; case ARG_GRACEFUL: arg_graceful = true; break; case ARG_PREFIX: if (strv_push(&arg_include_prefixes, optarg) < 0) return log_oom(); break; case ARG_EXCLUDE_PREFIX: if (strv_push(&arg_exclude_prefixes, optarg) < 0) return log_oom(); break; case ARG_ROOT: r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root); if (r < 0) return r; break; case ARG_IMAGE: #ifdef STANDALONE return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "This systemd-tmpfiles version is compiled without support for --image=."); #else r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image); if (r < 0) return r; #endif /* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */ _fallthrough_; case 'E': r = exclude_default_prefixes(); if (r < 0) return r; break; case ARG_IMAGE_POLICY: r = parse_image_policy_argument(optarg, &arg_image_policy); if (r < 0) return r; break; case ARG_REPLACE: if (!path_is_absolute(optarg)) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "The argument to --replace= must be an absolute path."); if (!endswith(optarg, ".conf")) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "The argument to --replace= must have the extension '.conf'."); arg_replace = optarg; break; case ARG_NO_PAGER: arg_pager_flags |= PAGER_DISABLE; break; case '?': return -EINVAL; default: assert_not_reached(); } if (arg_operation == 0 && arg_cat_flags == CAT_CONFIG_OFF) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "You need to specify at least one of --clean, --create, or --remove."); if (arg_replace && arg_cat_flags != CAT_CONFIG_OFF) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Option --replace= is not supported with --cat-config/--tldr."); if (arg_replace && optind >= argc) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "When --replace= is given, some configuration items must be specified."); if (arg_root && arg_runtime_scope == RUNTIME_SCOPE_USER) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Combination of --user and --root= is not supported."); if (arg_image && arg_root) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported."); return 1; } static int read_config_file( Context *c, char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) { _cleanup_hashmap_free_ Hashmap *uid_cache = NULL, *gid_cache = NULL; _cleanup_fclose_ FILE *_f = NULL; _cleanup_free_ char *pp = NULL; unsigned v = 0; FILE *f; ItemArray *ia; int r = 0; assert(c); assert(fn); if (streq(fn, "-")) { log_debug("Reading config from stdin%s", special_glyph(SPECIAL_GLYPH_ELLIPSIS)); fn = ""; f = stdin; } else { r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f, &pp); if (r < 0) { if (ignore_enoent && r == -ENOENT) { log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn); return 0; } return log_error_errno(r, "Failed to open '%s': %m", fn); } log_debug("Reading config file \"%s\"%s", pp, special_glyph(SPECIAL_GLYPH_ELLIPSIS)); fn = pp; f = _f; } for (;;) { _cleanup_free_ char *line = NULL; bool invalid_line = false; int k; k = read_stripped_line(f, LONG_LINE_MAX, &line); if (k < 0) return log_error_errno(k, "Failed to read '%s': %m", fn); if (k == 0) break; v++; if (IN_SET(line[0], 0, '#')) continue; k = parse_line(c, fn, v, line, &invalid_line, &uid_cache, &gid_cache); if (k < 0) { if (invalid_line) /* Allow reporting with a special code if the caller requested this */ *invalid_config = true; else if (r == 0) /* The first error becomes our return value */ r = k; } } /* we have to determine age parameter for each entry of type X */ ORDERED_HASHMAP_FOREACH(ia, c->globs) for (size_t ni = 0; ni < ia->n_items; ni++) { ItemArray *ja; Item *i = ia->items + ni, *candidate_item = NULL; if (i->type != IGNORE_DIRECTORY_PATH) continue; ORDERED_HASHMAP_FOREACH(ja, c->items) for (size_t nj = 0; nj < ja->n_items; nj++) { Item *j = ja->items + nj; if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA)) continue; if (path_equal(j->path, i->path)) { candidate_item = j; break; } if (candidate_item ? (path_startswith(j->path, candidate_item->path) && fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0) : path_startswith(i->path, j->path) != NULL) candidate_item = j; } if (candidate_item && candidate_item->age_set) { i->age = candidate_item->age; i->age_set = true; } } if (ferror(f)) { log_error_errno(errno, "Failed to read from file %s: %m", fn); if (r == 0) r = -EIO; } return r; } static int parse_arguments( Context *c, char **config_dirs, char **args, bool *invalid_config) { int r; assert(c); STRV_FOREACH(arg, args) { r = read_config_file(c, config_dirs, *arg, false, invalid_config); if (r < 0) return r; } return 0; } static int read_config_files( Context *c, char **config_dirs, char **args, bool *invalid_config) { _cleanup_strv_free_ char **files = NULL; _cleanup_free_ char *p = NULL; int r; assert(c); r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p); if (r < 0) return r; STRV_FOREACH(f, files) if (p && path_equal(*f, p)) { log_debug("Parsing arguments at position \"%s\"%s", *f, special_glyph(SPECIAL_GLYPH_ELLIPSIS)); r = parse_arguments(c, config_dirs, args, invalid_config); if (r < 0) return r; } else /* Just warn, ignore result otherwise. * read_config_file() has some debug output, so no need to print anything. */ (void) read_config_file(c, config_dirs, *f, true, invalid_config); return 0; } static int read_credential_lines(Context *c, bool *invalid_config) { _cleanup_free_ char *j = NULL; const char *d; int r; assert(c); r = get_credentials_dir(&d); if (r == -ENXIO) return 0; if (r < 0) return log_error_errno(r, "Failed to get credentials directory: %m"); j = path_join(d, "tmpfiles.extra"); if (!j) return log_oom(); (void) read_config_file(c, /* config_dirs= */ NULL, j, /* ignore_enoent= */ true, invalid_config); return 0; } static int link_parent(Context *c, ItemArray *a) { const char *path; char *prefix; int r; assert(c); assert(a); /* Finds the closest "parent" item array for the specified item array. Then registers the specified item array * as child of it, and fills the parent in, linking them both ways. This allows us to later create parents * before their children, and clean up/remove children before their parents. */ if (a->n_items <= 0) return 0; path = a->items[0].path; prefix = newa(char, strlen(path) + 1); PATH_FOREACH_PREFIX(prefix, path) { ItemArray *j; j = ordered_hashmap_get(c->items, prefix); if (!j) j = ordered_hashmap_get(c->globs, prefix); if (j) { r = set_ensure_put(&j->children, NULL, a); if (r < 0) return log_oom(); a->parent = j; return 1; } } return 0; } DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func, ItemArray, item_array_free); static int run(int argc, char *argv[]) { #ifndef STANDALONE _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL; _cleanup_(umount_and_freep) char *mounted_dir = NULL; #endif _cleanup_strv_free_ char **config_dirs = NULL; _cleanup_(context_done) Context c = {}; bool invalid_config = false; ItemArray *a; enum { PHASE_REMOVE_AND_CLEAN, PHASE_CREATE, _PHASE_MAX } phase; int r, k; r = parse_argv(argc, argv); if (r <= 0) return r; log_setup(); /* We require /proc/ for a lot of our operations, i.e. for adjusting access modes, for anything * SELinux related, for recursive operation, for xattr, acl and chattr handling, for btrfs stuff and * a lot more. It's probably the majority of invocations where /proc/ is required. Since people * apparently invoke it without anyway and are surprised about the failures, let's catch this early * and output a nice and friendly warning. */ if (proc_mounted() == 0) return log_error_errno(SYNTHETIC_ERRNO(ENOSYS), "/proc/ is not mounted, but required for successful operation of systemd-tmpfiles. " "Please mount /proc/. Alternatively, consider using the --root= or --image= switches."); /* Descending down file system trees might take a lot of fds */ (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE); switch (arg_runtime_scope) { case RUNTIME_SCOPE_USER: r = user_config_paths(&config_dirs); if (r < 0) return log_error_errno(r, "Failed to initialize configuration directory list: %m"); break; case RUNTIME_SCOPE_SYSTEM: config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d")); if (!config_dirs) return log_oom(); break; default: assert_not_reached(); } if (DEBUG_LOGGING) { _cleanup_free_ char *t = NULL; STRV_FOREACH(i, config_dirs) { _cleanup_free_ char *j = NULL; j = path_join(arg_root, *i); if (!j) return log_oom(); if (!strextend(&t, "\n\t", j)) return log_oom(); } log_debug("Looking for configuration files in (higher priority first):%s", t); } if (arg_cat_flags != CAT_CONFIG_OFF) return cat_config(config_dirs, argv + optind); umask(0022); r = mac_init(); if (r < 0) return r; #ifndef STANDALONE if (arg_image) { assert(!arg_root); r = mount_image_privately_interactively( arg_image, arg_image_policy, DISSECT_IMAGE_GENERIC_ROOT | DISSECT_IMAGE_REQUIRE_ROOT | DISSECT_IMAGE_VALIDATE_OS | DISSECT_IMAGE_RELAX_VAR_CHECK | DISSECT_IMAGE_FSCK | DISSECT_IMAGE_GROWFS, &mounted_dir, /* ret_dir_fd= */ NULL, &loop_device); if (r < 0) return r; arg_root = strdup(mounted_dir); if (!arg_root) return log_oom(); } #else assert(!arg_image); #endif c.items = ordered_hashmap_new(&item_array_hash_ops); c.globs = ordered_hashmap_new(&item_array_hash_ops); if (!c.items || !c.globs) return log_oom(); /* If command line arguments are specified along with --replace, read all * configuration files and insert the positional arguments at the specified * place. Otherwise, if command line arguments are specified, execute just * them, and finally, without --replace= or any positional arguments, just * read configuration and execute it. */ if (arg_replace || optind >= argc) r = read_config_files(&c, config_dirs, argv + optind, &invalid_config); else r = parse_arguments(&c, config_dirs, argv + optind, &invalid_config); if (r < 0) return r; r = read_credential_lines(&c, &invalid_config); if (r < 0) return r; /* Let's now link up all child/parent relationships */ ORDERED_HASHMAP_FOREACH(a, c.items) { r = link_parent(&c, a); if (r < 0) return r; } ORDERED_HASHMAP_FOREACH(a, c.globs) { r = link_parent(&c, a); if (r < 0) return r; } /* If multiple operations are requested, let's first run the remove/clean operations, and only then the create * operations. i.e. that we first clean out the platform we then build on. */ for (phase = 0; phase < _PHASE_MAX; phase++) { OperationMask op; if (phase == PHASE_REMOVE_AND_CLEAN) op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN); else if (phase == PHASE_CREATE) op = arg_operation & OPERATION_CREATE; else assert_not_reached(); if (op == 0) /* Nothing requested in this phase */ continue; /* The non-globbing ones usually create things, hence we apply them first */ ORDERED_HASHMAP_FOREACH(a, c.items) { k = process_item_array(&c, a, op); if (k < 0 && r >= 0) r = k; } /* The globbing ones usually alter things, hence we apply them second. */ ORDERED_HASHMAP_FOREACH(a, c.globs) { k = process_item_array(&c, a, op); if (k < 0 && r >= 0) r = k; } } if (ERRNO_IS_NEG_RESOURCE(r)) return r; if (invalid_config) return EX_DATAERR; if (r < 0) return EX_CANTCREAT; return 0; } DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);