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ed5d44d42c
Unprivileged user namespace creation is an intended feature to enable
sandboxing, however this feature is often used to as an initial step to
perform a privilege escalation attack.
This patch implements a new user_namespace { create } access control
permission to restrict which domains allow or deny user namespace
creation. This is necessary for system administrators to quickly protect
their systems while waiting for vulnerability patches to be applied.
This permission can be used in the following way:
allow domA_t domA_t : user_namespace { create };
Signed-off-by: Frederick Lawler <fred@cloudflare.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
265 lines
8.3 KiB
C
265 lines
8.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/capability.h>
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#include <linux/socket.h>
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#define COMMON_FILE_SOCK_PERMS "ioctl", "read", "write", "create", \
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"getattr", "setattr", "lock", "relabelfrom", "relabelto", "append", "map"
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#define COMMON_FILE_PERMS COMMON_FILE_SOCK_PERMS, "unlink", "link", \
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"rename", "execute", "quotaon", "mounton", "audit_access", \
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"open", "execmod", "watch", "watch_mount", "watch_sb", \
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"watch_with_perm", "watch_reads"
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#define COMMON_SOCK_PERMS COMMON_FILE_SOCK_PERMS, "bind", "connect", \
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"listen", "accept", "getopt", "setopt", "shutdown", "recvfrom", \
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"sendto", "name_bind"
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#define COMMON_IPC_PERMS "create", "destroy", "getattr", "setattr", "read", \
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"write", "associate", "unix_read", "unix_write"
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#define COMMON_CAP_PERMS "chown", "dac_override", "dac_read_search", \
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"fowner", "fsetid", "kill", "setgid", "setuid", "setpcap", \
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"linux_immutable", "net_bind_service", "net_broadcast", \
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"net_admin", "net_raw", "ipc_lock", "ipc_owner", "sys_module", \
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"sys_rawio", "sys_chroot", "sys_ptrace", "sys_pacct", "sys_admin", \
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"sys_boot", "sys_nice", "sys_resource", "sys_time", \
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"sys_tty_config", "mknod", "lease", "audit_write", \
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"audit_control", "setfcap"
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#define COMMON_CAP2_PERMS "mac_override", "mac_admin", "syslog", \
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"wake_alarm", "block_suspend", "audit_read", "perfmon", "bpf", \
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"checkpoint_restore"
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#if CAP_LAST_CAP > CAP_CHECKPOINT_RESTORE
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#error New capability defined, please update COMMON_CAP2_PERMS.
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#endif
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/*
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* Note: The name for any socket class should be suffixed by "socket",
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* and doesn't contain more than one substr of "socket".
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*/
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const struct security_class_mapping secclass_map[] = {
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{ "security",
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{ "compute_av", "compute_create", "compute_member",
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"check_context", "load_policy", "compute_relabel",
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"compute_user", "setenforce", "setbool", "setsecparam",
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"setcheckreqprot", "read_policy", "validate_trans", NULL } },
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{ "process",
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{ "fork", "transition", "sigchld", "sigkill",
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"sigstop", "signull", "signal", "ptrace", "getsched", "setsched",
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"getsession", "getpgid", "setpgid", "getcap", "setcap", "share",
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"getattr", "setexec", "setfscreate", "noatsecure", "siginh",
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"setrlimit", "rlimitinh", "dyntransition", "setcurrent",
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"execmem", "execstack", "execheap", "setkeycreate",
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"setsockcreate", "getrlimit", NULL } },
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{ "process2",
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{ "nnp_transition", "nosuid_transition", NULL } },
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{ "system",
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{ "ipc_info", "syslog_read", "syslog_mod",
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"syslog_console", "module_request", "module_load", NULL } },
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{ "capability",
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{ COMMON_CAP_PERMS, NULL } },
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{ "filesystem",
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{ "mount", "remount", "unmount", "getattr",
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"relabelfrom", "relabelto", "associate", "quotamod",
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"quotaget", "watch", NULL } },
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{ "file",
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{ COMMON_FILE_PERMS,
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"execute_no_trans", "entrypoint", NULL } },
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{ "dir",
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{ COMMON_FILE_PERMS, "add_name", "remove_name",
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"reparent", "search", "rmdir", NULL } },
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{ "fd", { "use", NULL } },
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{ "lnk_file",
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{ COMMON_FILE_PERMS, NULL } },
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{ "chr_file",
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{ COMMON_FILE_PERMS, NULL } },
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{ "blk_file",
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{ COMMON_FILE_PERMS, NULL } },
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{ "sock_file",
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{ COMMON_FILE_PERMS, NULL } },
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{ "fifo_file",
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{ COMMON_FILE_PERMS, NULL } },
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{ "socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "tcp_socket",
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{ COMMON_SOCK_PERMS,
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"node_bind", "name_connect",
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NULL } },
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{ "udp_socket",
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{ COMMON_SOCK_PERMS,
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"node_bind", NULL } },
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{ "rawip_socket",
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{ COMMON_SOCK_PERMS,
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"node_bind", NULL } },
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{ "node",
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{ "recvfrom", "sendto", NULL } },
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{ "netif",
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{ "ingress", "egress", NULL } },
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{ "netlink_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "packet_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "key_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "unix_stream_socket",
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{ COMMON_SOCK_PERMS, "connectto", NULL } },
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{ "unix_dgram_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "sem",
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{ COMMON_IPC_PERMS, NULL } },
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{ "msg", { "send", "receive", NULL } },
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{ "msgq",
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{ COMMON_IPC_PERMS, "enqueue", NULL } },
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{ "shm",
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{ COMMON_IPC_PERMS, "lock", NULL } },
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{ "ipc",
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{ COMMON_IPC_PERMS, NULL } },
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{ "netlink_route_socket",
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{ COMMON_SOCK_PERMS,
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"nlmsg_read", "nlmsg_write", NULL } },
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{ "netlink_tcpdiag_socket",
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{ COMMON_SOCK_PERMS,
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"nlmsg_read", "nlmsg_write", NULL } },
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{ "netlink_nflog_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_xfrm_socket",
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{ COMMON_SOCK_PERMS,
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"nlmsg_read", "nlmsg_write", NULL } },
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{ "netlink_selinux_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_iscsi_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_audit_socket",
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{ COMMON_SOCK_PERMS,
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"nlmsg_read", "nlmsg_write", "nlmsg_relay", "nlmsg_readpriv",
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"nlmsg_tty_audit", NULL } },
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{ "netlink_fib_lookup_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_connector_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_netfilter_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_dnrt_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "association",
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{ "sendto", "recvfrom", "setcontext", "polmatch", NULL } },
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{ "netlink_kobject_uevent_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_generic_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_scsitransport_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_rdma_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netlink_crypto_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "appletalk_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "packet",
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{ "send", "recv", "relabelto", "forward_in", "forward_out", NULL } },
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{ "key",
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{ "view", "read", "write", "search", "link", "setattr", "create",
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NULL } },
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{ "dccp_socket",
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{ COMMON_SOCK_PERMS,
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"node_bind", "name_connect", NULL } },
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{ "memprotect", { "mmap_zero", NULL } },
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{ "peer", { "recv", NULL } },
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{ "capability2",
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{ COMMON_CAP2_PERMS, NULL } },
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{ "kernel_service", { "use_as_override", "create_files_as", NULL } },
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{ "tun_socket",
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{ COMMON_SOCK_PERMS, "attach_queue", NULL } },
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{ "binder", { "impersonate", "call", "set_context_mgr", "transfer",
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NULL } },
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{ "cap_userns",
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{ COMMON_CAP_PERMS, NULL } },
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{ "cap2_userns",
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{ COMMON_CAP2_PERMS, NULL } },
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{ "sctp_socket",
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{ COMMON_SOCK_PERMS,
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"node_bind", "name_connect", "association", NULL } },
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{ "icmp_socket",
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{ COMMON_SOCK_PERMS,
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"node_bind", NULL } },
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{ "ax25_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "ipx_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "netrom_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "atmpvc_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "x25_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "rose_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "decnet_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "atmsvc_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "rds_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "irda_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "pppox_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "llc_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "can_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "tipc_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "bluetooth_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "iucv_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "rxrpc_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "isdn_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "phonet_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "ieee802154_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "caif_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "alg_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "nfc_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "vsock_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "kcm_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "qipcrtr_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "smc_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "infiniband_pkey",
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{ "access", NULL } },
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{ "infiniband_endport",
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{ "manage_subnet", NULL } },
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{ "bpf",
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{ "map_create", "map_read", "map_write", "prog_load", "prog_run",
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NULL } },
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{ "xdp_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "mctp_socket",
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{ COMMON_SOCK_PERMS, NULL } },
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{ "perf_event",
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{ "open", "cpu", "kernel", "tracepoint", "read", "write", NULL } },
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{ "anon_inode",
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{ COMMON_FILE_PERMS, NULL } },
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{ "io_uring",
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{ "override_creds", "sqpoll", NULL } },
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{ "user_namespace",
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{ "create", NULL } },
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{ NULL }
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};
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#if PF_MAX > 46
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#error New address family defined, please update secclass_map.
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#endif
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