/* SPDX-License-Identifier: LGPL-2.1+ */ /*** This file is part of systemd. Copyright 2010 Lennart Poettering, Kay Sievers Copyright 2015 Zbigniew Jędrzejewski-Szmek systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ #include #include #include #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 "capability-util.h" #include "chattr-util.h" #include "conf-files.h" #include "copy.h" #include "def.h" #include "dirent-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 "io-util.h" #include "label.h" #include "log.h" #include "macro.h" #include "missing.h" #include "mkdir.h" #include "mount-util.h" #include "parse-util.h" #include "path-lookup.h" #include "path-util.h" #include "rm-rf.h" #include "selinux-util.h" #include "set.h" #include "specifier.h" #include "stat-util.h" #include "stdio-util.h" #include "string-table.h" #include "string-util.h" #include "strv.h" #include "umask-util.h" #include "user-util.h" #include "util.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 ItemType { /* These ones take file names */ CREATE_FILE = 'f', TRUNCATE_FILE = '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 struct Item { ItemType type; char *path; char *argument; char **xattrs; #if HAVE_ACL acl_t acl_access; acl_t acl_default; #endif uid_t uid; gid_t gid; mode_t mode; usec_t age; dev_t major_minor; unsigned attribute_value; unsigned attribute_mask; bool uid_set:1; bool gid_set:1; bool mode_set:1; bool age_set:1; bool mask_perms:1; bool attribute_set:1; bool keep_first_level:1; bool force:1; bool done:1; } Item; typedef struct ItemArray { Item *items; size_t count; size_t size; } ItemArray; typedef enum DirectoryType { DIRECTORY_RUNTIME = 0, DIRECTORY_STATE, DIRECTORY_CACHE, DIRECTORY_LOGS, _DIRECTORY_TYPE_MAX, } DirectoryType; static bool arg_user = false; static bool arg_create = false; static bool arg_clean = false; static bool arg_remove = false; static bool arg_boot = false; static char **arg_include_prefixes = NULL; static char **arg_exclude_prefixes = NULL; static char *arg_root = NULL; static char *arg_replace = NULL; #define MAX_DEPTH 256 static OrderedHashmap *items = NULL, *globs = NULL; static Set *unix_sockets = NULL; static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret); static int specifier_directory(char specifier, void *data, void *userdata, char **ret); static const Specifier specifier_table[] = { { 'm', specifier_machine_id_safe, NULL }, { 'b', specifier_boot_id, NULL }, { 'H', specifier_host_name, NULL }, { 'v', specifier_kernel_release, NULL }, { 'U', specifier_user_id, NULL }, { 'u', specifier_user_name, NULL }, { 'h', specifier_user_home, NULL }, { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) }, { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) }, { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) }, { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) }, {} }; static int specifier_machine_id_safe(char specifier, void *data, void *userdata, char **ret) { int r; /* If /etc/machine_id is missing or empty (e.g. in a chroot environment) * return a recognizable error so that the caller can skip the rule * gracefully. */ r = specifier_machine_id(specifier, data, userdata, ret); if (IN_SET(r, -ENOENT, -ENOMEDIUM)) return -ENXIO; return r; } static int specifier_directory(char specifier, void *data, 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_CONFIGURATION }, [DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE }, [DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" }, }; unsigned i; const struct table_entry *paths; assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user)); paths = arg_user ? paths_user : paths_system; i = PTR_TO_UINT(data); assert(i < ELEMENTSOF(paths_system)); return sd_path_home(paths[i].type, paths[i].suffix, ret); } 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 (e.g. * in a chroot environment) where some specifiers are unresolvable. In user * mode, this is called when some variables are not defined. These cases are * not considered as an error so log at LOG_NOTICE only for the first time * and then downgrade this to LOG_DEBUG for the rest. */ log_full(notified ? LOG_DEBUG : LOG_NOTICE, "[%s:%u] Failed to resolve specifier: %s, skipping", filename, line, arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected"); if (!notified) log_notice("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 && r != -ENXIO) return r; r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d"); if (r < 0 && r != -ENXIO) return r; r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d"); if (r < 0 && r != -ENXIO) 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; Iterator i; ORDERED_HASHMAP_FOREACH(j, h, i) { unsigned n; for (n = 0; n < j->count; n++) { Item *item = j->items + n; if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0) return item; } } return NULL; } static void load_unix_sockets(void) { _cleanup_fclose_ FILE *f = NULL; int r; if (unix_sockets) return; /* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */ unix_sockets = set_new(&path_hash_ops); if (!unix_sockets) { log_oom(); return; } f = fopen("/proc/net/unix", "re"); if (!f) { log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno, "Failed to open /proc/net/unix, ignoring: %m"); goto fail; } /* Skip header */ r = read_line(f, LONG_LINE_MAX, NULL); if (r < 0) { log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m"); goto fail; } if (r == 0) { log_warning("Premature end of file reading /proc/net/unix."); goto fail; } for (;;) { _cleanup_free_ char *line = NULL; char *p, *s; r = read_line(f, LONG_LINE_MAX, &line); if (r < 0) { log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m"); goto fail; } 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 (*p != '/') continue; s = strdup(p); if (!s) { log_oom(); goto fail; } path_kill_slashes(s); r = set_consume(unix_sockets, s); if (r < 0 && r != -EEXIST) { log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m"); goto fail; } } return; fail: unix_sockets = set_free_free(unix_sockets); } static bool unix_socket_alive(const char *fn) { assert(fn); load_unix_sockets(); if (unix_sockets) return !!set_get(unix_sockets, (char*) fn); /* We don't know, so assume yes */ return true; } static int dir_is_mount_point(DIR *d, const char *subdir) { int mount_id_parent, mount_id; int r_p, r; r_p = name_to_handle_at_loop(dirfd(d), ".", NULL, &mount_id_parent, 0); if (r_p < 0) r_p = -errno; r = name_to_handle_at_loop(dirfd(d), subdir, NULL, &mount_id, 0); if (r < 0) r = -errno; /* got no handle; make no assumptions, return error */ if (r_p < 0 && r < 0) return r_p; /* got both handles; if they differ, it is a mount point */ if (r_p >= 0 && r >= 0) return mount_id_parent != mount_id; /* got only one handle; assume different mount points if one * of both queries was not supported by the filesystem */ if (IN_SET(r_p, -ENOSYS, -EOPNOTSUPP) || IN_SET(r, -ENOSYS, -EOPNOTSUPP)) return true; /* return error */ if (r_p < 0) return r_p; return r; } static DIR* xopendirat_nomod(int dirfd, const char *path) { DIR *dir; dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME); if (dir) return dir; 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 int dir_cleanup( Item *i, const char *p, DIR *d, const struct stat *ds, usec_t cutoff, dev_t rootdev, bool mountpoint, int maxdepth, bool keep_this_level) { struct dirent *dent; struct timespec times[2]; bool deleted = false; int r = 0; FOREACH_DIRENT_ALL(dent, d, break) { struct stat s; usec_t age; _cleanup_free_ char *sub_path = NULL; if (dot_or_dot_dot(dent->d_name)) continue; if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) { if (errno == ENOENT) continue; /* FUSE, NFS mounts, SELinux might return EACCES */ r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno, "stat(%s/%s) failed: %m", p, dent->d_name); continue; } /* Stay on the same filesystem */ if (s.st_dev != rootdev) { log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->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(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0) { log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name); continue; } sub_path = strjoin(p, "/", dent->d_name); if (!sub_path) { r = log_oom(); goto finish; } /* Is there an item configured for this path? */ if (ordered_hashmap_get(items, sub_path)) { log_debug("Ignoring \"%s\": a separate entry exists.", sub_path); continue; } if (find_glob(globs, sub_path)) { log_debug("Ignoring \"%s\": a separate glob exists.", sub_path); continue; } if (S_ISDIR(s.st_mode)) { if (mountpoint && streq(dent->d_name, "lost+found") && s.st_uid == 0) { log_debug("Ignoring \"%s\".", sub_path); continue; } if (maxdepth <= 0) log_warning("Reached max depth on \"%s\".", sub_path); else { _cleanup_closedir_ DIR *sub_dir; int q; sub_dir = xopendirat_nomod(dirfd(d), dent->d_name); if (!sub_dir) { if (errno != ENOENT) r = log_error_errno(errno, "opendir(%s) failed: %m", sub_path); continue; } q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false); 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 \"%s\".", sub_path); continue; } /* Ignore ctime, we change it when deleting */ age = timespec_load(&s.st_mtim); if (age >= cutoff) { char a[FORMAT_TIMESTAMP_MAX]; /* Follows spelling in stat(1). */ log_debug("Directory \"%s\": modify time %s is too new.", sub_path, format_timestamp_us(a, sizeof(a), age)); continue; } age = timespec_load(&s.st_atim); if (age >= cutoff) { char a[FORMAT_TIMESTAMP_MAX]; log_debug("Directory \"%s\": access time %s is too new.", sub_path, format_timestamp_us(a, sizeof(a), age)); continue; } log_debug("Removing directory \"%s\".", sub_path); if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0) if (!IN_SET(errno, ENOENT, ENOTEMPTY)) r = log_error_errno(errno, "rmdir(%s): %m", sub_path); } else { /* 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 (s.st_mode & S_ISVTX) { log_debug("Skipping \"%s\": sticky bit set.", sub_path); continue; } if (mountpoint && S_ISREG(s.st_mode)) if (s.st_uid == 0 && STR_IN_SET(dent->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(s.st_mode) && unix_socket_alive(sub_path)) { log_debug("Skipping \"%s\": live socket.", sub_path); continue; } /* Ignore device nodes */ if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_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; } age = timespec_load(&s.st_mtim); if (age >= cutoff) { char a[FORMAT_TIMESTAMP_MAX]; /* Follows spelling in stat(1). */ log_debug("File \"%s\": modify time %s is too new.", sub_path, format_timestamp_us(a, sizeof(a), age)); continue; } age = timespec_load(&s.st_atim); if (age >= cutoff) { char a[FORMAT_TIMESTAMP_MAX]; log_debug("File \"%s\": access time %s is too new.", sub_path, format_timestamp_us(a, sizeof(a), age)); continue; } age = timespec_load(&s.st_ctim); if (age >= cutoff) { char a[FORMAT_TIMESTAMP_MAX]; log_debug("File \"%s\": change time %s is too new.", sub_path, format_timestamp_us(a, sizeof(a), age)); continue; } log_debug("unlink \"%s\"", sub_path); if (unlinkat(dirfd(d), dent->d_name, 0) < 0) if (errno != ENOENT) r = log_error_errno(errno, "unlink(%s): %m", sub_path); deleted = true; } } finish: if (deleted) { usec_t age1, age2; char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX]; /* Restore original directory timestamps */ times[0] = ds->st_atim; times[1] = ds->st_mtim; age1 = timespec_load(&ds->st_atim); age2 = timespec_load(&ds->st_mtim); log_debug("Restoring access and modification time on \"%s\": %s, %s", p, format_timestamp_us(a, sizeof(a), age1), format_timestamp_us(b, sizeof(b), age2)); if (futimens(dirfd(d), times) < 0) log_error_errno(errno, "utimensat(%s): %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 int fd_set_perms(Item *i, int fd, const struct stat *st) { _cleanup_free_ char *path = NULL; int r; assert(i); assert(fd); r = fd_get_path(fd, &path); if (r < 0) return r; if (!i->mode_set && !i->uid_set && !i->gid_set) goto shortcut; if (hardlink_vulnerable(st)) { log_error("Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path); return -EPERM; } if (i->mode_set) { if (S_ISLNK(st->st_mode)) log_debug("Skipping mode fix for symlink %s.", path); else { mode_t m = i->mode; if (i->mask_perms) { if (!(st->st_mode & 0111)) m &= ~0111; if (!(st->st_mode & 0222)) m &= ~0222; if (!(st->st_mode & 0444)) m &= ~0444; if (!S_ISDIR(st->st_mode)) m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */ } if (m == (st->st_mode & 07777)) log_debug("\"%s\" has correct mode %o already.", path, st->st_mode); else { char procfs_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; log_debug("Changing \"%s\" to mode %o.", path, m); /* fchmodat() still doesn't have AT_EMPTY_PATH flag. */ xsprintf(procfs_path, "/proc/self/fd/%i", fd); if (chmod(procfs_path, m) < 0) return log_error_errno(errno, "chmod() of %s via %s failed: %m", path, procfs_path); } } } if ((i->uid_set && i->uid != st->st_uid) || (i->gid_set && i->gid != st->st_gid)) { log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT, path, i->uid_set ? i->uid : UID_INVALID, i->gid_set ? i->gid : GID_INVALID); if (fchownat(fd, "", i->uid_set ? i->uid : UID_INVALID, i->gid_set ? i->gid : GID_INVALID, AT_EMPTY_PATH) < 0) return log_error_errno(errno, "fchownat() of %s failed: %m", path); } shortcut: return label_fix(path, false, false); } static int path_set_perms(Item *i, const char *path) { _cleanup_close_ int fd = -1; struct stat st; assert(i); assert(path); fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (fd < 0) { int level = LOG_ERR, r = -errno; /* Option "e" operates only on existing objects. Do not * print errors about non-existent files or directories */ if (i->type == EMPTY_DIRECTORY && errno == ENOENT) { level = LOG_DEBUG; r = 0; } log_full_errno(level, errno, "Adjusting owner and mode for %s failed: %m", path); return r; } if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat() file %s: %m", path); return fd_set_perms(i, fd, &st); } static int parse_xattrs_from_arg(Item *i) { const char *p; int r; assert(i); assert(i->argument); p = i->argument; for (;;) { _cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL; r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|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(Item *i, int fd, const struct stat *st) { char procfs_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; _cleanup_free_ char *path = NULL; char **name, **value; int r; assert(i); assert(fd); r = fd_get_path(fd, &path); if (r < 0) return r; xsprintf(procfs_path, "/proc/self/fd/%i", fd); STRV_FOREACH_PAIR(name, value, i->xattrs) { log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path); if (setxattr(procfs_path, *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(Item *i, const char *path) { _cleanup_close_ int fd = -1; assert(i); assert(path); fd = open(path, O_CLOEXEC|O_NOFOLLOW|O_PATH); if (fd < 0) return log_error_errno(errno, "Cannot open '%s': %m", path); return fd_set_xattrs(i, fd, NULL); } static int parse_acls_from_arg(Item *item) { #if HAVE_ACL int r; assert(item); /* If 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_default, !item->force); if (r < 0) log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument); #else log_warning_errno(ENOSYS, "ACLs are not supported. Ignoring"); #endif return 0; } #if HAVE_ACL static int path_set_acl(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; /* 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) /* 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(Item *item, int fd, const struct stat *st) { int r = 0; #if HAVE_ACL char procfs_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; _cleanup_free_ char *path = NULL; assert(item); assert(fd); assert(st); r = fd_get_path(fd, &path); if (r < 0) return r; if (hardlink_vulnerable(st)) { log_error("Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.", path); return -EPERM; } if (S_ISLNK(st->st_mode)) { log_debug("Skipping ACL fix for symlink %s.", path); return 0; } xsprintf(procfs_path, "/proc/self/fd/%i", fd); if (item->acl_access) r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->force); if (r == 0 && item->acl_default) r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->force); if (r > 0) return -r; /* already warned */ if (r == -EOPNOTSUPP) { log_debug_errno(r, "ACLs not supported by file system at %s", path); return 0; } if (r < 0) return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path); #endif return r; } static int path_set_acls(Item *item, const char *path) { int r = 0; #ifdef HAVE_ACL _cleanup_close_ int fd = -1; struct stat st; assert(item); assert(path); fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH); if (fd < 0) return log_error_errno(errno, "Adjusting ACL of %s failed: %m", path); if (fstat(fd, &st) < 0) return log_error_errno(errno, "Failed to fstat() file %s: %m", path); r = fd_set_acls(item, fd, &st); #endif return r; } #define ATTRIBUTES_ALL \ (FS_NOATIME_FL | \ FS_SYNC_FL | \ FS_DIRSYNC_FL | \ FS_APPEND_FL | \ FS_COMPR_FL | \ FS_NODUMP_FL | \ FS_EXTENT_FL | \ FS_IMMUTABLE_FL | \ FS_JOURNAL_DATA_FL | \ FS_SECRM_FL | \ FS_UNRM_FL | \ FS_NOTAIL_FL | \ FS_TOPDIR_FL | \ FS_NOCOW_FL) 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 */ }; 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) { log_error("Setting file attribute on '%s' needs an attribute specification.", item->path); return -EINVAL; } for (; p && *p ; p++) { unsigned i, v; for (i = 0; i < ELEMENTSOF(attributes); i++) if (*p == attributes[i].character) break; if (i >= ELEMENTSOF(attributes)) { log_error("Unknown file attribute '%c' on '%s'.", *p, item->path); return -EINVAL; } v = attributes[i].value; SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET)); mask |= v; } if (mode == MODE_SET) mask |= ATTRIBUTES_ALL; assert(mask != 0); item->attribute_mask = mask; item->attribute_value = value; item->attribute_set = true; return 0; } static int fd_set_attribute(Item *item, int fd, const struct stat *st) { char procfs_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; _cleanup_close_ int procfs_fd = -1; _cleanup_free_ char *path = NULL; unsigned f; int r; if (!item->attribute_set || item->attribute_mask == 0) return 0; r = fd_get_path(fd, &path); if (r < 0) return r; /* 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)) { log_error("Setting file flags is only supported on regular files and directories, cannot set on '%s'.", path); return -EINVAL; } f = item->attribute_value & item->attribute_mask; /* Mask away directory-specific flags */ if (!S_ISDIR(st->st_mode)) f &= ~FS_DIRSYNC_FL; xsprintf(procfs_path, "/proc/self/fd/%i", fd); procfs_fd = open(procfs_path, O_RDONLY|O_CLOEXEC|O_NOATIME); if (procfs_fd < 0) return -errno; r = chattr_fd(procfs_fd, f, item->attribute_mask); if (r < 0) log_full_errno(IN_SET(r, -ENOTTY, -EOPNOTSUPP) ? LOG_DEBUG : LOG_WARNING, r, "Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x: %m", path, item->attribute_value, item->attribute_mask); return 0; } static int path_set_attribute(Item *item, const char *path) { _cleanup_close_ int fd = -1; struct stat st; if (!item->attribute_set || item->attribute_mask == 0) return 0; fd = open(path, O_CLOEXEC|O_NOFOLLOW|O_PATH); if (fd < 0) return log_error_errno(errno, "Cannot open '%s': %m", path); if (fstat(fd, &st) < 0) return log_error_errno(errno, "Cannot stat '%s': %m", path); return fd_set_attribute(item, fd, &st); } static int write_one_file(Item *i, const char *path) { _cleanup_close_ int fd = -1; int flags, r = 0; struct stat st; assert(i); assert(path); flags = i->type == CREATE_FILE ? O_CREAT|O_EXCL|O_NOFOLLOW : i->type == TRUNCATE_FILE ? O_CREAT|O_TRUNC|O_NOFOLLOW : 0; RUN_WITH_UMASK(0000) { mac_selinux_create_file_prepare(path, S_IFREG); fd = open(path, flags|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode); mac_selinux_create_file_clear(); } if (fd < 0) { if (i->type == WRITE_FILE && errno == ENOENT) { log_debug_errno(errno, "Not writing missing file \"%s\": %m", path); return 0; } if (i->type == CREATE_FILE && errno == EEXIST) { log_debug_errno(errno, "Not writing to pre-existing file \"%s\": %m", path); goto done; } r = -errno; if (!i->argument && errno == EROFS && stat(path, &st) == 0 && (i->type == CREATE_FILE || st.st_size == 0)) goto check_mode; return log_error_errno(r, "Failed to create file %s: %m", path); } if (i->argument) { log_debug("%s to \"%s\".", i->type == CREATE_FILE ? "Appending" : "Writing", path); r = loop_write(fd, i->argument, strlen(i->argument), false); if (r < 0) return log_error_errno(r, "Failed to write file \"%s\": %m", path); } else log_debug("\"%s\" has been created.", path); fd = safe_close(fd); done: if (stat(path, &st) < 0) return log_error_errno(errno, "stat(%s) failed: %m", path); check_mode: if (!S_ISREG(st.st_mode)) { log_error("%s is not a file.", path); return -EEXIST; } r = path_set_perms(i, path); if (r < 0) return r; return 0; } typedef int (*action_t)(Item *, const char *); typedef int (*fdaction_t)(Item *, int fd, const struct stat *st); static int item_do(Item *i, int fd, const struct stat *st, fdaction_t action) { int r = 0, q; assert(i); assert(fd >= 0); assert(st); /* This returns the first error we run into, but nevertheless * tries to go on */ r = action(i, fd, st); if (S_ISDIR(st->st_mode)) { char procfs_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; _cleanup_closedir_ DIR *d = NULL; struct dirent *de; /* The passed 'fd' was opened with O_PATH. We need to convert * it into a 'regular' fd before reading the directory content. */ xsprintf(procfs_path, "/proc/self/fd/%i", fd); d = opendir(procfs_path); if (!d) { r = r ?: -errno; goto finish; } FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) { struct stat de_st; 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 && fstat(de_fd, &de_st) >= 0) /* pass ownership of dirent fd over */ q = item_do(i, de_fd, &de_st, action); else q = -errno; if (q < 0 && r == 0) r = q; } } finish: safe_close(fd); return r; } static int glob_item(Item *i, action_t action) { _cleanup_globfree_ glob_t g = { .gl_opendir = (void *(*)(const char *)) opendir_nomod, }; int r = 0, k; char **fn; 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) { k = action(i, *fn); if (k < 0 && r == 0) r = k; } return r; } static int glob_item_recursively(Item *i, fdaction_t action) { _cleanup_globfree_ glob_t g = { .gl_opendir = (void *(*)(const char *)) opendir_nomod, }; int r = 0, k; char **fn; 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 = -1; struct stat st; /* 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) { r = r ?: -errno; continue; } if (fstat(fd, &st) < 0) { r = r ?: -errno; continue; } k = item_do(i, fd, &st, action); if (k < 0 && r == 0) r = k; /* we passed fd ownership to the previous call */ fd = -1; } return r; } typedef enum { CREATION_NORMAL, CREATION_EXISTING, CREATION_FORCE, _CREATION_MODE_MAX, _CREATION_MODE_INVALID = -1 } CreationMode; static const char *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 int create_item(Item *i) { struct stat st; int r = 0; int q = 0; CreationMode creation; 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 CREATE_FILE: case TRUNCATE_FILE: RUN_WITH_UMASK(0000) (void) mkdir_parents_label(i->path, 0755); r = write_one_file(i, i->path); if (r < 0) return r; break; case COPY_FILES: { RUN_WITH_UMASK(0000) (void) mkdir_parents_label(i->path, 0755); log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path); r = copy_tree(i->argument, i->path, i->uid_set ? i->uid : UID_INVALID, i->gid_set ? i->gid : GID_INVALID, COPY_REFLINK); if (r == -EROFS && stat(i->path, &st) == 0) r = -EEXIST; if (r < 0) { struct stat a, b; if (r != -EEXIST) return log_error_errno(r, "Failed to copy files to %s: %m", i->path); if (stat(i->argument, &a) < 0) return log_error_errno(errno, "stat(%s) failed: %m", i->argument); if (stat(i->path, &b) < 0) return log_error_errno(errno, "stat(%s) failed: %m", i->path); if ((a.st_mode ^ b.st_mode) & S_IFMT) { log_debug("Can't copy to %s, file exists already and is of different type", i->path); return 0; } } r = path_set_perms(i, i->path); if (r < 0) return r; break; case WRITE_FILE: r = glob_item(i, write_one_file); if (r < 0) return r; break; case CREATE_DIRECTORY: case TRUNCATE_DIRECTORY: case CREATE_SUBVOLUME: case CREATE_SUBVOLUME_INHERIT_QUOTA: case CREATE_SUBVOLUME_NEW_QUOTA: RUN_WITH_UMASK(0000) (void) mkdir_parents_label(i->path, 0755); if (IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA)) { if (btrfs_is_subvol(isempty(arg_root) ? "/" : arg_root) <= 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. */ r = -ENOTTY; else { RUN_WITH_UMASK((~i->mode) & 0777) r = btrfs_subvol_make(i->path); } } else r = 0; if (IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY) || r == -ENOTTY) RUN_WITH_UMASK(0000) r = mkdir_label(i->path, i->mode); if (r < 0) { int k; if (!IN_SET(r, -EEXIST, -EROFS)) return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", i->path); k = is_dir(i->path, false); if (k == -ENOENT && r == -EROFS) return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", i->path); if (k < 0) return log_error_errno(k, "Failed to check if %s exists: %m", i->path); if (!k) { log_warning("\"%s\" already exists and is not a directory.", i->path); return 0; } creation = CREATION_EXISTING; } else creation = CREATION_NORMAL; log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), i->path); if (IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) { r = btrfs_subvol_auto_qgroup(i->path, 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 == -ENOPROTOOPT) 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); } _fallthrough_; case EMPTY_DIRECTORY: r = path_set_perms(i, i->path); if (q < 0) return q; if (r < 0) return r; break; case CREATE_FIFO: RUN_WITH_UMASK(0000) { (void) mkdir_parents_label(i->path, 0755); mac_selinux_create_file_prepare(i->path, S_IFIFO); r = mkfifo(i->path, i->mode); mac_selinux_create_file_clear(); } if (r < 0) { if (errno != EEXIST) return log_error_errno(errno, "Failed to create fifo %s: %m", i->path); if (lstat(i->path, &st) < 0) return log_error_errno(errno, "stat(%s) failed: %m", i->path); if (!S_ISFIFO(st.st_mode)) { if (i->force) { RUN_WITH_UMASK(0000) { mac_selinux_create_file_prepare(i->path, S_IFIFO); r = mkfifo_atomic(i->path, i->mode); mac_selinux_create_file_clear(); } if (r < 0) return log_error_errno(r, "Failed to create fifo %s: %m", i->path); creation = CREATION_FORCE; } else { log_warning("\"%s\" already exists and is not a fifo.", i->path); return 0; } } else creation = CREATION_EXISTING; } else creation = CREATION_NORMAL; log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), i->path); r = path_set_perms(i, i->path); if (r < 0) return r; break; } case CREATE_SYMLINK: { RUN_WITH_UMASK(0000) (void) mkdir_parents_label(i->path, 0755); mac_selinux_create_file_prepare(i->path, S_IFLNK); r = symlink(i->argument, i->path); mac_selinux_create_file_clear(); if (r < 0) { _cleanup_free_ char *x = NULL; if (errno != EEXIST) return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path); r = readlink_malloc(i->path, &x); if (r < 0 || !streq(i->argument, x)) { if (i->force) { mac_selinux_create_file_prepare(i->path, S_IFLNK); r = symlink_atomic(i->argument, i->path); mac_selinux_create_file_clear(); if (IN_SET(r, -EEXIST, -ENOTEMPTY)) { r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL); if (r < 0) return log_error_errno(r, "rm -fr %s failed: %m", i->path); mac_selinux_create_file_prepare(i->path, S_IFLNK); r = symlink(i->argument, i->path) < 0 ? -errno : 0; mac_selinux_create_file_clear(); } if (r < 0) return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path); creation = CREATION_FORCE; } else { log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path); return 0; } } else creation = CREATION_EXISTING; } else creation = CREATION_NORMAL; log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path); break; } case CREATE_BLOCK_DEVICE: case CREATE_CHAR_DEVICE: { mode_t file_type; 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; } RUN_WITH_UMASK(0000) (void) mkdir_parents_label(i->path, 0755); file_type = i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR; RUN_WITH_UMASK(0000) { mac_selinux_create_file_prepare(i->path, file_type); r = mknod(i->path, i->mode | file_type, i->major_minor); mac_selinux_create_file_clear(); } if (r < 0) { if (errno == EPERM) { log_debug("We lack permissions, possibly because of cgroup configuration; " "skipping creation of device node %s.", i->path); return 0; } if (errno != EEXIST) return log_error_errno(errno, "Failed to create device node %s: %m", i->path); if (lstat(i->path, &st) < 0) return log_error_errno(errno, "stat(%s) failed: %m", i->path); if ((st.st_mode & S_IFMT) != file_type) { if (i->force) { RUN_WITH_UMASK(0000) { mac_selinux_create_file_prepare(i->path, file_type); r = mknod_atomic(i->path, 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); creation = CREATION_FORCE; } else { log_debug("%s is not a device node.", i->path); return 0; } } else creation = CREATION_EXISTING; } else creation = CREATION_NORMAL; 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)); r = path_set_perms(i, i->path); if (r < 0) return r; break; } case ADJUST_MODE: case RELABEL_PATH: r = glob_item(i, path_set_perms); if (r < 0) return r; break; case RECURSIVE_RELABEL_PATH: r = glob_item_recursively(i, fd_set_perms); if (r < 0) return r; break; case SET_XATTR: r = glob_item(i, path_set_xattrs); if (r < 0) return r; break; case RECURSIVE_SET_XATTR: r = glob_item_recursively(i, fd_set_xattrs); if (r < 0) return r; break; case SET_ACL: r = glob_item(i, path_set_acls); if (r < 0) return r; break; case RECURSIVE_SET_ACL: r = glob_item_recursively(i, fd_set_acls); if (r < 0) return r; break; case SET_ATTRIBUTE: r = glob_item(i, path_set_attribute); if (r < 0) return r; break; case RECURSIVE_SET_ATTRIBUTE: r = glob_item_recursively(i, fd_set_attribute); if (r < 0) return r; break; } return 0; } static int remove_item_instance(Item *i, const char *instance) { int r; 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 TRUNCATE_DIRECTORY: 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, (i->type == RECURSIVE_REMOVE_PATH ? REMOVE_ROOT|REMOVE_SUBVOLUME : 0) | REMOVE_PHYSICAL); if (r < 0 && r != -ENOENT) return log_error_errno(r, "rm_rf(%s): %m", instance); break; default: assert_not_reached("wut?"); } return 0; } static int remove_item(Item *i) { assert(i); log_debug("Running remove action for entry %c %s", (char) i->type, i->path); switch (i->type) { case REMOVE_PATH: case TRUNCATE_DIRECTORY: case RECURSIVE_REMOVE_PATH: return glob_item(i, remove_item_instance); default: return 0; } } static int clean_item_instance(Item *i, const char* instance) { _cleanup_closedir_ DIR *d = NULL; struct stat s, ps; bool mountpoint; usec_t cutoff, n; char timestamp[FORMAT_TIMESTAMP_MAX]; 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); } if (fstat(dirfd(d), &s) < 0) return log_error_errno(errno, "stat(%s) failed: %m", i->path); if (!S_ISDIR(s.st_mode)) { log_error("%s is not a directory.", i->path); return -ENOTDIR; } if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0) return log_error_errno(errno, "stat(%s/..) failed: %m", i->path); mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino; log_debug("Cleanup threshold for %s \"%s\" is %s", mountpoint ? "mount point" : "directory", instance, format_timestamp_us(timestamp, sizeof(timestamp), cutoff)); return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint, MAX_DEPTH, i->keep_first_level); } static int clean_item(Item *i) { 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(i, i->path); return 0; case EMPTY_DIRECTORY: case IGNORE_DIRECTORY_PATH: return glob_item(i, clean_item_instance); default: return 0; } } static int process_item_array(ItemArray *array); static int process_item(Item *i) { int r, q, p, t = 0; _cleanup_free_ char *prefix = NULL; assert(i); if (i->done) return 0; i->done = true; prefix = malloc(strlen(i->path) + 1); if (!prefix) return log_oom(); PATH_FOREACH_PREFIX(prefix, i->path) { ItemArray *j; j = ordered_hashmap_get(items, prefix); if (j) { int s; s = process_item_array(j); if (s < 0 && t == 0) t = s; } } if (chase_symlinks(i->path, NULL, CHASE_NO_AUTOFS, NULL) == -EREMOTE) return t; r = arg_create ? create_item(i) : 0; q = arg_remove ? remove_item(i) : 0; p = arg_clean ? clean_item(i) : 0; return t < 0 ? t : r < 0 ? r : q < 0 ? q : p; } static int process_item_array(ItemArray *array) { unsigned n; int r = 0, k; assert(array); for (n = 0; n < array->count; n++) { k = process_item(array->items + n); if (k < 0 && r == 0) r = k; } return r; } static void item_free_contents(Item *i) { assert(i); free(i->path); free(i->argument); strv_free(i->xattrs); #if HAVE_ACL acl_free(i->acl_access); acl_free(i->acl_default); #endif } static void item_array_free(ItemArray *a) { unsigned n; if (!a) return; for (n = 0; n < a->count; n++) item_free_contents(a->items + n); free(a->items); free(a); } static int item_compare(const void *a, const void *b) { const Item *x = a, *y = 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(x->type) && !takes_ownership(y->type)) return -1; if (!takes_ownership(x->type) && takes_ownership(y->type)) return 1; return (int) x->type - (int) y->type; } static bool item_compatible(Item *a, 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 streq_ptr(a->argument, b->argument) && a->uid_set == b->uid_set && a->uid == b->uid && a->gid_set == b->gid_set && a->gid == b->gid && a->mode_set == b->mode_set && a->mode == b->mode && a->age_set == b->age_set && a->age == b->age && 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) { char **prefix; 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 whitelist 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(Item *i) { _cleanup_free_ char *unescaped = NULL, *resolved = NULL; char **xattr; int r; assert(i); if (i->argument == NULL) return 0; switch (i->type) { case COPY_FILES: case CREATE_SYMLINK: case CREATE_FILE: case TRUNCATE_FILE: case WRITE_FILE: r = cunescape(i->argument, 0, &unescaped); if (r < 0) return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument); r = specifier_printf(unescaped, specifier_table, NULL, &resolved); if (r < 0) return r; free_and_replace(i->argument, resolved); break; case SET_XATTR: case RECURSIVE_SET_XATTR: assert(i->xattrs); STRV_FOREACH (xattr, i->xattrs) { r = specifier_printf(*xattr, specifier_table, NULL, &resolved); if (r < 0) return r; free_and_replace(*xattr, resolved); } break; default: break; } return 0; } static int parse_line(const char *fname, unsigned line, const char *buffer, bool *invalid_config) { _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL; _cleanup_(item_free_contents) Item i = {}; ItemArray *existing; OrderedHashmap *h; int r, pos; bool force = false, boot = false; assert(fname); assert(line >= 1); assert(buffer); r = extract_many_words( &buffer, NULL, EXTRACT_QUOTES, &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_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line); } else if (r < 2) { *invalid_config = true; log_error("[%s:%u] Syntax error.", fname, line); return -EIO; } if (!isempty(buffer) && !streq(buffer, "-")) { i.argument = strdup(buffer); if (!i.argument) return log_oom(); } if (isempty(action)) { *invalid_config = true; log_error("[%s:%u] Command too short '%s'.", fname, line, action); return -EINVAL; } for (pos = 1; action[pos]; pos++) { if (action[pos] == '!' && !boot) boot = true; else if (action[pos] == '+' && !force) force = true; else { *invalid_config = true; log_error("[%s:%u] Unknown modifiers in command '%s'", fname, line, action); return -EINVAL; } } if (boot && !arg_boot) { log_debug("Ignoring entry %s \"%s\" because --boot is not specified.", action, path); return 0; } i.type = action[0]; i.force = force; r = specifier_printf(path, specifier_table, NULL, &i.path); if (r == -ENXIO) return log_unresolvable_specifier(fname, line); if (r < 0) { if (IN_SET(r, -EINVAL, -EBADSLT)) *invalid_config = true; return log_error_errno(r, "[%s:%u] Failed to replace specifiers: %s", fname, line, 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_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type); break; case CREATE_FILE: case TRUNCATE_FILE: break; case CREATE_SYMLINK: if (!i.argument) { i.argument = strappend("/usr/share/factory/", i.path); if (!i.argument) return log_oom(); } break; case WRITE_FILE: if (!i.argument) { *invalid_config = true; log_error("[%s:%u] Write file requires argument.", fname, line); return -EBADMSG; } break; case COPY_FILES: if (!i.argument) { i.argument = strappend("/usr/share/factory/", i.path); if (!i.argument) return log_oom(); } else if (!path_is_absolute(i.argument)) { *invalid_config = true; log_error("[%s:%u] Source path is not absolute.", fname, line); return -EBADMSG; } path_kill_slashes(i.argument); break; case CREATE_CHAR_DEVICE: case CREATE_BLOCK_DEVICE: { unsigned major, minor; if (!i.argument) { *invalid_config = true; log_error("[%s:%u] Device file requires argument.", fname, line); return -EBADMSG; } if (sscanf(i.argument, "%u:%u", &major, &minor) != 2) { *invalid_config = true; log_error("[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i.argument); return -EBADMSG; } i.major_minor = makedev(major, minor); break; } case SET_XATTR: case RECURSIVE_SET_XATTR: if (!i.argument) { *invalid_config = true; log_error("[%s:%u] Set extended attribute requires argument.", fname, line); return -EBADMSG; } r = parse_xattrs_from_arg(&i); if (r < 0) return r; break; case SET_ACL: case RECURSIVE_SET_ACL: if (!i.argument) { *invalid_config = true; log_error("[%s:%u] Set ACLs requires argument.", fname, line); return -EBADMSG; } r = parse_acls_from_arg(&i); if (r < 0) return r; break; case SET_ATTRIBUTE: case RECURSIVE_SET_ATTRIBUTE: if (!i.argument) { *invalid_config = true; log_error("[%s:%u] Set file attribute requires argument.", fname, line); return -EBADMSG; } r = parse_attribute_from_arg(&i); if (IN_SET(r, -EINVAL, -EBADSLT)) *invalid_config = true; if (r < 0) return r; break; default: log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type); *invalid_config = true; return -EBADMSG; } if (!path_is_absolute(i.path)) { log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path); *invalid_config = true; return -EBADMSG; } path_kill_slashes(i.path); if (!should_include_path(i.path)) return 0; r = specifier_expansion_from_arg(&i); if (r == -ENXIO) return log_unresolvable_specifier(fname, line); if (r < 0) { if (IN_SET(r, -EINVAL, -EBADSLT)) *invalid_config = true; return log_error_errno(r, "[%s:%u] Failed to substitute specifiers in argument: %m", fname, line); } if (arg_root) { char *p; p = prefix_root(arg_root, i.path); if (!p) return log_oom(); free(i.path); i.path = p; } if (!isempty(user) && !streq(user, "-")) { const char *u = user; r = get_user_creds(&u, &i.uid, NULL, NULL, NULL); if (r < 0) { *invalid_config = true; return log_error_errno(r, "[%s:%u] Unknown user '%s'.", fname, line, user); } i.uid_set = true; } if (!isempty(group) && !streq(group, "-")) { const char *g = group; r = get_group_creds(&g, &i.gid); if (r < 0) { *invalid_config = true; log_error("[%s:%u] Unknown group '%s'.", fname, line, group); return r; } i.gid_set = true; } if (!isempty(mode) && !streq(mode, "-")) { const char *mm = mode; unsigned m; if (*mm == '~') { i.mask_perms = true; mm++; } if (parse_mode(mm, &m) < 0) { *invalid_config = true; log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode); return -EBADMSG; } 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 (!isempty(age) && !streq(age, "-")) { const char *a = age; if (*a == '~') { i.keep_first_level = true; a++; } if (parse_sec(a, &i.age) < 0) { *invalid_config = true; log_error("[%s:%u] Invalid age '%s'.", fname, line, age); return -EBADMSG; } i.age_set = true; } h = needs_glob(i.type) ? globs : items; existing = ordered_hashmap_get(h, i.path); if (existing) { unsigned n; for (n = 0; n < existing->count; n++) { if (!item_compatible(existing->items + n, &i)) { log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.", fname, line, 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) return log_oom(); } if (!GREEDY_REALLOC(existing->items, existing->size, existing->count + 1)) return log_oom(); memcpy(existing->items + existing->count++, &i, sizeof(i)); /* Sort item array, to enforce stable ordering of application */ qsort_safe(existing->items, existing->count, sizeof(Item), item_compare); zero(i); return 0; } static void help(void) { printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" "Creates, deletes and cleans up volatile and temporary files and directories.\n\n" " -h --help Show this help\n" " --user Execute user configuration\n" " --version Show package version\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" " --prefix=PATH Only apply rules with the specified prefix\n" " --exclude-prefix=PATH Ignore rules with the specified prefix\n" " --root=PATH Operate on an alternate filesystem root\n" " --replace=PATH Treat arguments as replacement for PATH\n" , program_invocation_short_name); } static int parse_argv(int argc, char *argv[]) { enum { ARG_VERSION = 0x100, ARG_USER, ARG_CREATE, ARG_CLEAN, ARG_REMOVE, ARG_BOOT, ARG_PREFIX, ARG_EXCLUDE_PREFIX, ARG_ROOT, ARG_REPLACE, }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "user", no_argument, NULL, ARG_USER }, { "version", no_argument, NULL, ARG_VERSION }, { "create", no_argument, NULL, ARG_CREATE }, { "clean", no_argument, NULL, ARG_CLEAN }, { "remove", no_argument, NULL, ARG_REMOVE }, { "boot", no_argument, NULL, ARG_BOOT }, { "prefix", required_argument, NULL, ARG_PREFIX }, { "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX }, { "root", required_argument, NULL, ARG_ROOT }, { "replace", required_argument, NULL, ARG_REPLACE }, {} }; int c, r; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) switch (c) { case 'h': help(); return 0; case ARG_VERSION: return version(); case ARG_USER: arg_user = true; break; case ARG_CREATE: arg_create = true; break; case ARG_CLEAN: arg_clean = true; break; case ARG_REMOVE: arg_remove = true; break; case ARG_BOOT: arg_boot = 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_and_warn(optarg, true, &arg_root); if (r < 0) return r; break; case ARG_REPLACE: if (!path_is_absolute(optarg) || !endswith(optarg, ".conf")) { log_error("The argument to --replace= must an absolute path to a config file"); return -EINVAL; } arg_replace = optarg; break; case '?': return -EINVAL; default: assert_not_reached("Unhandled option"); } if (!arg_clean && !arg_create && !arg_remove) { log_error("You need to specify at least one of --clean, --create or --remove."); return -EINVAL; } if (arg_replace && optind >= argc) { log_error("When --replace= is given, some configuration items must be specified"); return -EINVAL; } return 1; } static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) { _cleanup_fclose_ FILE *_f = NULL; FILE *f; char line[LINE_MAX]; Iterator iterator; unsigned v = 0; Item *i; int r = 0; assert(fn); if (streq(fn, "-")) { log_debug("Reading config from stdin…"); fn = ""; f = stdin; } else { r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f); 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\"…", fn); f = _f; } FOREACH_LINE(line, f, break) { char *l; int k; bool invalid_line = false; v++; l = strstrip(line); if (IN_SET(*l, 0, '#')) continue; k = parse_line(fn, v, l, &invalid_line); 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(i, globs, iterator) { Iterator iter; Item *j, *candidate_item = NULL; if (i->type != IGNORE_DIRECTORY_PATH) continue; ORDERED_HASHMAP_FOREACH(j, items, iter) { 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(i->path, j->path)) || (candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0))) 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(char **config_dirs, char **args, bool *invalid_config) { char **arg; int r; STRV_FOREACH(arg, args) { r = read_config_file(config_dirs, *arg, false, invalid_config); if (r < 0) return r; } return 0; } static int read_config_files(char **config_dirs, char **args, bool *invalid_config) { _cleanup_strv_free_ char **files = NULL; _cleanup_free_ char *p = NULL; char **f; int r; r = conf_files_list_strv(&files, ".conf", arg_root, 0, (const char* const*) config_dirs); if (r < 0) return log_error_errno(r, "Failed to enumerate tmpfiles.d files: %m"); if (arg_replace) { r = conf_files_insert(&files, arg_root, config_dirs, arg_replace); if (r < 0) return log_error_errno(r, "Failed to extend tmpfiles.d file list: %m"); p = path_join(arg_root, arg_replace, NULL); if (!p) return log_oom(); } STRV_FOREACH(f, files) if (p && path_equal(*f, p)) { log_debug("Parsing arguments at position \"%s\"…", *f); r = parse_arguments(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(config_dirs, *f, true, invalid_config); return 0; } int main(int argc, char *argv[]) { int r, k; ItemArray *a; Iterator iterator; _cleanup_strv_free_ char **config_dirs = NULL; bool invalid_config = false; r = parse_argv(argc, argv); if (r <= 0) goto finish; log_set_target(LOG_TARGET_AUTO); log_parse_environment(); log_open(); umask(0022); mac_selinux_init(); items = ordered_hashmap_new(&string_hash_ops); globs = ordered_hashmap_new(&string_hash_ops); if (!items || !globs) { r = log_oom(); goto finish; } r = 0; if (arg_user) { r = user_config_paths(&config_dirs); if (r < 0) { log_error_errno(r, "Failed to initialize configuration directory list: %m"); goto finish; } } else { config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d")); if (!config_dirs) { r = log_oom(); goto finish; } } if (DEBUG_LOGGING) { _cleanup_free_ char *t = NULL; t = strv_join(config_dirs, "\n\t"); if (t) log_debug("Looking for configuration files in (higher priority first:\n\t%s", t); } /* 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(config_dirs, argv + optind, &invalid_config); else r = parse_arguments(config_dirs, argv + optind, &invalid_config); if (r < 0) goto finish; /* The non-globbing ones usually create things, hence we apply * them first */ ORDERED_HASHMAP_FOREACH(a, items, iterator) { k = process_item_array(a); if (k < 0 && r == 0) r = k; } /* The globbing ones usually alter things, hence we apply them * second. */ ORDERED_HASHMAP_FOREACH(a, globs, iterator) { k = process_item_array(a); if (k < 0 && r == 0) r = k; } finish: ordered_hashmap_free_with_destructor(items, item_array_free); ordered_hashmap_free_with_destructor(globs, item_array_free); free(arg_include_prefixes); free(arg_exclude_prefixes); free(arg_root); set_free_free(unix_sockets); mac_selinux_finish(); if (r < 0) return EXIT_FAILURE; else if (invalid_config) return EX_DATAERR; else return EXIT_SUCCESS; }