214 lines
8 KiB
C
214 lines
8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <stdint.h>
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#include <sys/mount.h>
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#include "sd-bus.h"
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#include "bus-error.h"
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#include "dev-setup.h"
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#include "format-util.h"
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#include "fs-util.h"
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#include "label.h"
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#include "limits-util.h"
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#include "main-func.h"
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#include "mkdir.h"
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#include "mount-util.h"
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#include "mountpoint-util.h"
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#include "path-util.h"
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#include "rm-rf.h"
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#include "selinux-util.h"
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#include "smack-util.h"
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#include "stdio-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "user-util.h"
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static int acquire_runtime_dir_properties(uint64_t *size, uint64_t *inodes) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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int r;
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r = sd_bus_default_system(&bus);
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if (r < 0)
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return log_error_errno(r, "Failed to connect to system bus: %m");
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r = sd_bus_get_property_trivial(bus, "org.freedesktop.login1", "/org/freedesktop/login1", "org.freedesktop.login1.Manager", "RuntimeDirectorySize", &error, 't', size);
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if (r < 0) {
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log_warning_errno(r, "Failed to acquire runtime directory size, ignoring: %s", bus_error_message(&error, r));
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*size = physical_memory_scale(10U, 100U); /* 10% */
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}
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r = sd_bus_get_property_trivial(bus, "org.freedesktop.login1", "/org/freedesktop/login1", "org.freedesktop.login1.Manager", "RuntimeDirectoryInodesMax", &error, 't', inodes);
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if (r < 0) {
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log_warning_errno(r, "Failed to acquire number of inodes for runtime directory, ignoring: %s", bus_error_message(&error, r));
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*inodes = DIV_ROUND_UP(*size, 4096);
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}
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return 0;
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}
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static int user_mkdir_runtime_path(
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const char *runtime_path,
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uid_t uid,
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gid_t gid,
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uint64_t runtime_dir_size,
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uint64_t runtime_dir_inodes) {
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int r;
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assert(runtime_path);
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assert(path_is_absolute(runtime_path));
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assert(uid_is_valid(uid));
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assert(gid_is_valid(gid));
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r = mkdir_safe_label("/run/user", 0755, 0, 0, MKDIR_WARN_MODE);
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if (r < 0)
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return log_error_errno(r, "Failed to create /run/user: %m");
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if (path_is_mount_point(runtime_path, NULL, 0) >= 0)
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log_debug("%s is already a mount point", runtime_path);
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else {
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char options[sizeof("mode=0700,uid=,gid=,size=,nr_inodes=,smackfsroot=*")
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+ DECIMAL_STR_MAX(uid_t)
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+ DECIMAL_STR_MAX(gid_t)
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+ DECIMAL_STR_MAX(uint64_t)
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+ DECIMAL_STR_MAX(uint64_t)];
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xsprintf(options,
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"mode=0700,uid=" UID_FMT ",gid=" GID_FMT ",size=%" PRIu64 ",nr_inodes=%" PRIu64 "%s",
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uid, gid, runtime_dir_size, runtime_dir_inodes,
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mac_smack_use() ? ",smackfsroot=*" : "");
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(void) mkdir_label(runtime_path, 0700);
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r = mount_nofollow_verbose(LOG_DEBUG, "tmpfs", runtime_path, "tmpfs", MS_NODEV|MS_NOSUID, options);
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if (r < 0) {
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if (!ERRNO_IS_PRIVILEGE(r)) {
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log_error_errno(r, "Failed to mount per-user tmpfs directory %s: %m", runtime_path);
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goto fail;
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}
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log_debug_errno(r,
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"Failed to mount per-user tmpfs directory %s.\n"
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"Assuming containerized execution, ignoring: %m", runtime_path);
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r = chmod_and_chown(runtime_path, 0700, uid, gid);
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if (r < 0) {
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log_error_errno(r, "Failed to change ownership and mode of \"%s\": %m", runtime_path);
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goto fail;
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}
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}
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r = label_fix(runtime_path, 0);
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if (r < 0)
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log_warning_errno(r, "Failed to fix label of \"%s\", ignoring: %m", runtime_path);
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}
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return 0;
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fail:
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/* Try to clean up, but ignore errors */
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(void) rmdir(runtime_path);
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return r;
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}
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static int user_remove_runtime_path(const char *runtime_path) {
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int r;
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assert(runtime_path);
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assert(path_is_absolute(runtime_path));
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r = rm_rf(runtime_path, 0);
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if (r < 0)
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log_debug_errno(r, "Failed to remove runtime directory %s (before unmounting), ignoring: %m", runtime_path);
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/* Ignore cases where the directory isn't mounted, as that's quite possible, if we lacked the permissions to
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* mount something */
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r = umount2(runtime_path, MNT_DETACH);
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if (r < 0 && !IN_SET(errno, EINVAL, ENOENT))
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log_debug_errno(errno, "Failed to unmount user runtime directory %s, ignoring: %m", runtime_path);
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r = rm_rf(runtime_path, REMOVE_ROOT);
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if (r < 0 && r != -ENOENT)
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return log_error_errno(r, "Failed to remove runtime directory %s (after unmounting): %m", runtime_path);
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return 0;
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}
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static int do_mount(const char *user) {
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char runtime_path[sizeof("/run/user") + DECIMAL_STR_MAX(uid_t)];
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uint64_t runtime_dir_size, runtime_dir_inodes;
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uid_t uid;
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gid_t gid;
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int r;
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r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
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if (r < 0)
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return log_error_errno(r,
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r == -ESRCH ? "No such user \"%s\"" :
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r == -ENOMSG ? "UID \"%s\" is invalid or has an invalid main group"
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: "Failed to look up user \"%s\": %m",
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user);
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r = acquire_runtime_dir_properties(&runtime_dir_size, &runtime_dir_inodes);
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if (r < 0)
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return r;
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xsprintf(runtime_path, "/run/user/" UID_FMT, uid);
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log_debug("Will mount %s owned by "UID_FMT":"GID_FMT, runtime_path, uid, gid);
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return user_mkdir_runtime_path(runtime_path, uid, gid, runtime_dir_size, runtime_dir_inodes);
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}
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static int do_umount(const char *user) {
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char runtime_path[sizeof("/run/user") + DECIMAL_STR_MAX(uid_t)];
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uid_t uid;
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int r;
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/* The user may be already removed. So, first try to parse the string by parse_uid(),
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* and if it fails, fall back to get_user_creds().*/
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if (parse_uid(user, &uid) < 0) {
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r = get_user_creds(&user, &uid, NULL, NULL, NULL, 0);
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if (r < 0)
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return log_error_errno(r,
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r == -ESRCH ? "No such user \"%s\"" :
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r == -ENOMSG ? "UID \"%s\" is invalid or has an invalid main group"
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: "Failed to look up user \"%s\": %m",
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user);
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}
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xsprintf(runtime_path, "/run/user/" UID_FMT, uid);
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log_debug("Will remove %s", runtime_path);
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return user_remove_runtime_path(runtime_path);
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}
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static int run(int argc, char *argv[]) {
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int r;
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log_parse_environment();
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log_open();
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if (argc != 3)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"This program takes two arguments.");
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if (!STR_IN_SET(argv[1], "start", "stop"))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"First argument must be either \"start\" or \"stop\".");
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umask(0022);
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r = mac_selinux_init();
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if (r < 0)
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return r;
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if (streq(argv[1], "start"))
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return do_mount(argv[2]);
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if (streq(argv[1], "stop"))
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return do_umount(argv[2]);
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assert_not_reached("Unknown verb!");
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}
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DEFINE_MAIN_FUNCTION(run);
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