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