/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 #include #include #include "log.h" #include "util.h" #include "macro.h" #include "missing.h" #include "mkdir.h" #include "path-util.h" #include "strv.h" #include "label.h" #include "set.h" #include "conf-files.h" #include "capability.h" #include "specifier.h" #include "build.h" #include "copy.h" #include "selinux-util.h" #include "btrfs-util.h" #include "acl-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_FIFO = 'p', CREATE_SYMLINK = 'L', CREATE_CHAR_DEVICE = 'c', CREATE_BLOCK_DEVICE = 'b', COPY_FILES = 'C', /* These ones take globs */ SET_XATTR = 't', RECURSIVE_SET_XATTR = 'T', SET_ACL = 'a', RECURSIVE_SET_ACL = 'A', WRITE_FILE = 'w', IGNORE_PATH = 'x', IGNORE_DIRECTORY_PATH = 'X', REMOVE_PATH = 'r', RECURSIVE_REMOVE_PATH = 'R', ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */ RELABEL_PATH = 'z', RECURSIVE_RELABEL_PATH = 'Z', } ItemType; typedef struct Item { ItemType type; char *path; char *argument; char **xattrs; #ifdef 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; bool uid_set:1; bool gid_set:1; bool mode_set:1; bool age_set:1; bool mask_perms: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; 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 const char conf_file_dirs[] = CONF_DIRS_NULSTR("tmpfiles"); #define MAX_DEPTH 256 static Hashmap *items = NULL, *globs = NULL; static Set *unix_sockets = NULL; static bool needs_glob(ItemType t) { return IN_SET(t, WRITE_FILE, IGNORE_PATH, IGNORE_DIRECTORY_PATH, REMOVE_PATH, RECURSIVE_REMOVE_PATH, ADJUST_MODE, RELABEL_PATH, RECURSIVE_RELABEL_PATH, SET_XATTR, RECURSIVE_SET_XATTR, SET_ACL, RECURSIVE_SET_ACL); } static bool takes_ownership(ItemType t) { return IN_SET(t, CREATE_FILE, TRUNCATE_FILE, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, 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(Hashmap *h, const char *match) { ItemArray *j; Iterator i; 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; char line[LINE_MAX]; 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(&string_hash_ops); if (!unix_sockets) return; f = fopen("/proc/net/unix", "re"); if (!f) return; /* Skip header */ if (!fgets(line, sizeof(line), f)) goto fail; for (;;) { char *p, *s; int k; if (!fgets(line, sizeof(line), f)) break; truncate_nl(line); 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) goto fail; path_kill_slashes(s); k = set_consume(unix_sockets, s); if (k < 0 && k != -EEXIST) goto fail; } return; fail: set_free_free(unix_sockets); unix_sockets = NULL; } 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) { union file_handle_union h = FILE_HANDLE_INIT; int mount_id_parent, mount_id; int r_p, r; r_p = name_to_handle_at(dirfd(d), ".", &h.handle, &mount_id_parent, 0); if (r_p < 0) r_p = -errno; h.handle.handle_bytes = MAX_HANDLE_SZ; r = name_to_handle_at(dirfd(d), subdir, &h.handle, &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 (r_p == -ENOSYS || r_p == -EOPNOTSUPP || r == -ENOSYS || r == -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) { log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path); if (errno == EPERM) { 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; while ((dent = readdir(d))) { struct stat s; usec_t age; _cleanup_free_ char *sub_path = NULL; if (STR_IN_SET(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 */ if (errno == EACCES) log_debug_errno(errno, "stat(%s/%s) failed: %m", p, dent->d_name); else log_error_errno(errno, "stat(%s/%s) failed: %m", p, dent->d_name); r = -errno; 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; } /* Do not delete read-only files owned by root */ if (s.st_uid == 0 && !(s.st_mode & S_IWUSR)) { log_debug("Ignoring \"%s/%s\": read-only and owner by root.", p, dent->d_name); continue; } sub_path = strjoin(p, "/", dent->d_name, NULL); if (!sub_path) { r = log_oom(); goto finish; } /* Is there an item configured for this path? */ if (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 (errno != ENOENT && errno != ENOTEMPTY) { log_error_errno(errno, "rmdir(%s): %m", sub_path); r = -errno; } } 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 ((streq(dent->d_name, ".journal") && s.st_uid == 0) || streq(dent->d_name, "aquota.user") || streq(dent->d_name, "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 int path_set_perms(Item *i, const char *path) { struct stat st; bool st_valid; assert(i); assert(path); st_valid = stat(path, &st) == 0; /* not using i->path directly because it may be a glob */ if (i->mode_set) { mode_t m = i->mode; if (i->mask_perms && st_valid) { 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 (st_valid && m == (st.st_mode & 07777)) log_debug("\"%s\" has right mode %o", path, st.st_mode); else { log_debug("chmod \"%s\" to mode %o", path, m); if (chmod(path, m) < 0) return log_error_errno(errno, "chmod(%s) failed: %m", path); } } if ((!st_valid || i->uid != st.st_uid || i->gid != st.st_gid) && (i->uid_set || i->gid_set)) { log_debug("chown \"%s\" to "UID_FMT"."GID_FMT, path, i->uid_set ? i->uid : UID_INVALID, i->gid_set ? i->gid : GID_INVALID); if (chown(path, i->uid_set ? i->uid : UID_INVALID, i->gid_set ? i->gid : GID_INVALID) < 0) return log_error_errno(errno, "chown(%s) failed: %m", path); } return label_fix(path, false, false); } static int get_xattrs_from_arg(Item *i) { char *xattr; const char *p; int r; assert(i); assert(i->argument); p = i->argument; while ((r = unquote_first_word(&p, &xattr, false)) > 0) { _cleanup_free_ char *tmp = NULL, *name = NULL, *value = NULL, *value2 = NULL, *_xattr = xattr; r = split_pair(xattr, "=", &name, &value); if (r < 0) { log_warning("Illegal xattr found: \"%s\" - ignoring.", xattr); continue; } if (strempty(name) || strempty(value)) { log_warning("Malformed xattr found: \"%s\" - ignoring.", xattr); continue; } tmp = unquote(value, "\""); if (!tmp) return log_oom(); value2 = cunescape(tmp); if (!value2) return log_oom(); if (strv_push_pair(&i->xattrs, name, value2) < 0) return log_oom(); name = value2 = NULL; } return r; } static int path_set_xattrs(Item *i, const char *path) { char **name, **value; assert(i); assert(path); STRV_FOREACH_PAIR(name, value, i->xattrs) { int n; n = strlen(*value); log_debug("\"%s\": setting xattr \"%s=%s\"", path, *name, *value); if (lsetxattr(path, *name, *value, n, 0) < 0) { log_error("Setting extended attribute %s=%s on %s failed: %m", *name, *value, path); return -errno; } } return 0; } static int get_acls_from_arg(Item *item) { #ifdef 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; } #ifdef HAVE_ACL static int path_set_acl(const char *path, acl_type_t type, acl_t acl, bool modify) { _cleanup_(acl_freep) acl_t dup = NULL; int r; _cleanup_(acl_free_charpp) char *t = NULL; 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("\"%s\": setting %s ACL \"%s\"", path, type == ACL_TYPE_ACCESS ? "access" : "default", strna(t)); r = acl_set_file(path, type, dup); if (r < 0) return log_error_errno(-errno, "Setting %s ACL \"%s\" on %s failed: %m", type == ACL_TYPE_ACCESS ? "access" : "default", strna(t), path); return 0; } #endif static int path_set_acls(Item *item, const char *path) { #ifdef HAVE_ACL int r; assert(item); assert(path); if (item->acl_access) { r = path_set_acl(path, ACL_TYPE_ACCESS, item->acl_access, item->force); if (r < 0) return r; } if (item->acl_default) { r = path_set_acl(path, ACL_TYPE_DEFAULT, item->acl_default, item->force); if (r < 0) return r; } #endif return 0; } 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_APPEND|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 \"%s\": %m", path); return 0; } log_error_errno(errno, "Failed to create file %s: %m", path); return -errno; } if (i->argument) { _cleanup_free_ char *unescaped; log_debug("%s to \"%s\".", i->type == CREATE_FILE ? "Appending" : "Writing", path); unescaped = cunescape(i->argument); if (!unescaped) return log_oom(); r = loop_write(fd, unescaped, strlen(unescaped), 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); if (stat(path, &st) < 0) return log_error_errno(errno, "stat(%s) failed: %m", path); 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 *); static int item_do_children(Item *i, const char *path, action_t action) { _cleanup_closedir_ DIR *d; int r = 0; assert(i); assert(path); /* This returns the first error we run into, but nevertheless * tries to go on */ d = opendir_nomod(path); if (!d) return errno == ENOENT || errno == ENOTDIR ? 0 : -errno; for (;;) { _cleanup_free_ char *p = NULL; struct dirent *de; int q; errno = 0; de = readdir(d); if (!de) { if (errno != 0 && r == 0) r = -errno; break; } if (STR_IN_SET(de->d_name, ".", "..")) continue; p = strjoin(path, "/", de->d_name, NULL); if (!p) return -ENOMEM; q = action(i, p); if (q < 0 && q != -ENOENT && r == 0) r = q; if (IN_SET(de->d_type, DT_UNKNOWN, DT_DIR)) { q = item_do_children(i, p, action); if (q < 0 && r == 0) r = q; } } return r; } static int glob_item(Item *i, action_t action, bool recursive) { _cleanup_globfree_ glob_t g = { .gl_closedir = (void (*)(void *)) closedir, .gl_readdir = (struct dirent *(*)(void *)) readdir, .gl_opendir = (void *(*)(const char *)) opendir_nomod, .gl_lstat = lstat, .gl_stat = stat, }; int r = 0, k; char **fn; errno = 0; k = glob(i->path, GLOB_NOSORT|GLOB_BRACE|GLOB_ALTDIRFUNC, NULL, &g); if (k != 0 && k != GLOB_NOMATCH) return log_error_errno(errno ?: EIO, "glob(%s) failed: %m", i->path); STRV_FOREACH(fn, g.gl_pathv) { k = action(i, *fn); if (k < 0 && r == 0) r = k; if (recursive) { k = item_do_children(i, *fn, action); if (k < 0 && r == 0) r = k; } } 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; 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: r = write_one_file(i, i->path); if (r < 0) return r; break; case COPY_FILES: log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path); r = copy_tree(i->argument, i->path, false); 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, false); if (r < 0) return r; break; case CREATE_DIRECTORY: case TRUNCATE_DIRECTORY: case CREATE_SUBVOLUME: RUN_WITH_UMASK(0000) mkdir_parents_label(i->path, 0755); if (i->type == CREATE_SUBVOLUME) RUN_WITH_UMASK((~i->mode) & 0777) { r = btrfs_subvol_make(i->path); log_debug_errno(r, "Creating subvolume \"%s\": %m", 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) { if (r != -EEXIST) return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", i->path); if (stat(i->path, &st) < 0) return log_error_errno(errno, "stat(%s) failed: %m", i->path); if (!S_ISDIR(st.st_mode)) { log_debug("\"%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); r = path_set_perms(i, i->path); if (r < 0) return r; break; case CREATE_FIFO: RUN_WITH_UMASK(0000) { 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 (stat(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_debug("%s 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: 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 (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; } 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 (stat(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, false); if (r < 0) return r; break; case RECURSIVE_RELABEL_PATH: r = glob_item(i, path_set_perms, true); if (r < 0) return r; break; case SET_XATTR: r = glob_item(i, path_set_xattrs, false); if (r < 0) return r; break; case RECURSIVE_SET_XATTR: r = glob_item(i, path_set_xattrs, true); if (r < 0) return r; break; case SET_ACL: r = glob_item(i, path_set_acls, false); if (r < 0) return r; break; case RECURSIVE_SET_ACL: r = glob_item(i, path_set_acls, true); if (r < 0) return r; break; } log_debug("%s created successfully.", i->path); 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_dangerous(instance, false, i->type == RECURSIVE_REMOVE_PATH, false); 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) { int r = 0; assert(i); log_debug("Running remove action for entry %c %s", (char) i->type, i->path); switch (i->type) { case CREATE_FILE: case TRUNCATE_FILE: case CREATE_DIRECTORY: case CREATE_SUBVOLUME: case CREATE_FIFO: case CREATE_SYMLINK: case CREATE_CHAR_DEVICE: case CREATE_BLOCK_DEVICE: case IGNORE_PATH: case IGNORE_DIRECTORY_PATH: case ADJUST_MODE: case RELABEL_PATH: case RECURSIVE_RELABEL_PATH: case WRITE_FILE: case COPY_FILES: case SET_XATTR: case RECURSIVE_SET_XATTR: case SET_ACL: case RECURSIVE_SET_ACL: break; case REMOVE_PATH: case TRUNCATE_DIRECTORY: case RECURSIVE_REMOVE_PATH: r = glob_item(i, remove_item_instance, false); break; } return r; } 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 (errno == ENOENT || errno == ENOTDIR) { log_debug_errno(errno, "Directory \"%s\": %m", instance); return 0; } log_error_errno(errno, "Failed to open directory %s: %m", instance); return -errno; } 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_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) { int r = 0; 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 TRUNCATE_DIRECTORY: case IGNORE_PATH: case COPY_FILES: clean_item_instance(i, i->path); break; case IGNORE_DIRECTORY_PATH: r = glob_item(i, clean_item_instance, false); break; default: break; } return r; } 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 = hashmap_get(items, prefix); if (j) { int s; s = process_item_array(j); if (s < 0 && t == 0) t = s; } } 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); #ifdef 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 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_length(arg_include_prefixes) == 0) return true; log_debug("Entry \"%s\" does not match any include prefix, skipping.", path); return false; } static int parse_line(const char *fname, unsigned line, const char *buffer) { static const Specifier specifier_table[] = { { 'm', specifier_machine_id, NULL }, { 'b', specifier_boot_id, NULL }, { 'H', specifier_host_name, NULL }, { 'v', specifier_kernel_release, NULL }, {} }; _cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL; _cleanup_(item_free_contents) Item i = {}; ItemArray *existing; Hashmap *h; int r, c = -1, pos; bool force = false, boot = false; assert(fname); assert(line >= 1); assert(buffer); r = sscanf(buffer, "%ms %ms %ms %ms %ms %ms %n", &action, &path, &mode, &user, &group, &age, &c); if (r < 2) { log_error("[%s:%u] Syntax error.", fname, line); return -EIO; } if (isempty(action)) { 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 { 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 < 0) { log_error("[%s:%u] Failed to replace specifiers: %s", fname, line, path); return r; } if (c >= 0) { c += strspn(buffer+c, WHITESPACE); if (buffer[c] != 0 && (buffer[c] != '-' || buffer[c+1] != 0)) { i.argument = unquote(buffer+c, "\""); if (!i.argument) return log_oom(); } } switch (i.type) { case CREATE_FILE: case TRUNCATE_FILE: case CREATE_DIRECTORY: case CREATE_SUBVOLUME: 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: 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) { 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)) { 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) { log_error("[%s:%u] Device file requires argument.", fname, line); return -EBADMSG; } if (sscanf(i.argument, "%u:%u", &major, &minor) != 2) { 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) { log_error("[%s:%u] Set extended attribute requires argument.", fname, line); return -EBADMSG; } r = get_xattrs_from_arg(&i); if (r < 0) return r; break; case SET_ACL: case RECURSIVE_SET_ACL: if (!i.argument) { log_error("[%s:%u] Set ACLs requires argument.", fname, line); return -EBADMSG; } r = get_acls_from_arg(&i); if (r < 0) return r; break; default: log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type); return -EBADMSG; } if (!path_is_absolute(i.path)) { log_error("[%s:%u] Path '%s' not absolute.", fname, line, i.path); return -EBADMSG; } path_kill_slashes(i.path); if (!should_include_path(i.path)) return 0; if (arg_root) { char *p; p = strappend(arg_root, i.path); if (!p) return log_oom(); free(i.path); i.path = p; } if (user && !streq(user, "-")) { const char *u = user; r = get_user_creds(&u, &i.uid, NULL, NULL, NULL); if (r < 0) { log_error("[%s:%u] Unknown user '%s'.", fname, line, user); return r; } i.uid_set = true; } if (group && !streq(group, "-")) { const char *g = group; r = get_group_creds(&g, &i.gid); if (r < 0) { log_error("[%s:%u] Unknown group '%s'.", fname, line, group); return r; } i.gid_set = true; } if (mode && !streq(mode, "-")) { const char *mm = mode; unsigned m; if (*mm == '~') { i.mask_perms = true; mm++; } if (sscanf(mm, "%o", &m) != 1) { log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode); return -ENOENT; } i.mode = m; i.mode_set = true; } else i.mode = IN_SET(i.type, CREATE_DIRECTORY, CREATE_SUBVOLUME, TRUNCATE_DIRECTORY) ? 0755 : 0644; if (age && !streq(age, "-")) { const char *a = age; if (*a == '~') { i.keep_first_level = true; a++; } if (parse_sec(a, &i.age) < 0) { log_error("[%s:%u] Invalid age '%s'.", fname, line, age); return -EBADMSG; } i.age_set = true; } h = needs_glob(i.type) ? globs : items; existing = hashmap_get(h, i.path); if (existing) { unsigned n; for (n = 0; n < existing->count; n++) { if (!item_compatible(existing->items + n, &i)) log_warning("[%s:%u] Duplicate line for path \"%s\", ignoring.", fname, line, i.path); } } else { existing = new0(ItemArray, 1); r = 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)); 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" " --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", program_invocation_short_name); } static int parse_argv(int argc, char *argv[]) { enum { ARG_VERSION = 0x100, ARG_CREATE, ARG_CLEAN, ARG_REMOVE, ARG_BOOT, ARG_PREFIX, ARG_EXCLUDE_PREFIX, ARG_ROOT, }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "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 }, {} }; int c; 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: puts(PACKAGE_STRING); puts(SYSTEMD_FEATURES); return 0; 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: free(arg_root); arg_root = path_make_absolute_cwd(optarg); if (!arg_root) return log_oom(); path_kill_slashes(arg_root); 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; } return 1; } static int read_config_file(const char *fn, bool ignore_enoent) { _cleanup_fclose_ FILE *f = NULL; char line[LINE_MAX]; Iterator iterator; unsigned v = 0; Item *i; int r; assert(fn); r = search_and_fopen_nulstr(fn, "re", arg_root, conf_file_dirs, &f); if (r < 0) { if (ignore_enoent && r == -ENOENT) { log_debug_errno(r, "Failed to open \"%s\": %m", fn); return 0; } return log_error_errno(r, "Failed to open '%s', ignoring: %m", fn); } log_debug("Reading config file \"%s\".", fn); FOREACH_LINE(line, f, break) { char *l; int k; v++; l = strstrip(line); if (*l == '#' || *l == 0) continue; k = parse_line(fn, v, l); if (k < 0 && r == 0) r = k; } /* we have to determine age parameter for each entry of type X */ HASHMAP_FOREACH(i, globs, iterator) { Iterator iter; Item *j, *candidate_item = NULL; if (i->type != IGNORE_DIRECTORY_PATH) continue; HASHMAP_FOREACH(j, items, iter) { if (j->type != CREATE_DIRECTORY && j->type != TRUNCATE_DIRECTORY && j->type != CREATE_SUBVOLUME) 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; } int main(int argc, char *argv[]) { int r, k; ItemArray *a; Iterator iterator; 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(NULL); items = hashmap_new(&string_hash_ops); globs = hashmap_new(&string_hash_ops); if (!items || !globs) { r = log_oom(); goto finish; } r = 0; if (optind < argc) { int j; for (j = optind; j < argc; j++) { k = read_config_file(argv[j], false); if (k < 0 && r == 0) r = k; } } else { _cleanup_strv_free_ char **files = NULL; char **f; r = conf_files_list_nulstr(&files, ".conf", arg_root, conf_file_dirs); if (r < 0) { log_error_errno(r, "Failed to enumerate tmpfiles.d files: %m"); goto finish; } STRV_FOREACH(f, files) { k = read_config_file(*f, true); if (k < 0 && r == 0) r = k; } } HASHMAP_FOREACH(a, globs, iterator) { k = process_item_array(a); if (k < 0 && r == 0) r = k; } HASHMAP_FOREACH(a, items, iterator) { k = process_item_array(a); if (k < 0 && r == 0) r = k; } finish: while ((a = hashmap_steal_first(items))) item_array_free(a); while ((a = hashmap_steal_first(globs))) item_array_free(a); hashmap_free(items); hashmap_free(globs); free(arg_include_prefixes); free(arg_exclude_prefixes); free(arg_root); set_free_free(unix_sockets); mac_selinux_finish(); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }