5fd175fa45
The implementation for NETLINK_FIREWALL and NETLINK_IP6_FW protocols
was removed from the kernel in commit
d16cf20e2f2f13411eece7f7fb72c17d141c4a84 ("netfilter: remove ip_queue
support") circa Linux 3.5. Consequently, kernels >= 3.5 should never
perform permission checks on these classes although they remained
defined in the SELinux kernel classmap until the netlink classes
were updated by
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6c6d2e9bde1c1c87a7ead806f8f5e2181d41a652
circa Linux v4.2.
Removing these class definitions would break legacy userspace that relies
upon stable values for the userspace security class definitions since it
will perturb those values by removing classes that preceded them. dbus-daemon
in particular is known to break if its dbus class changes at runtime,
which could occur upon a policy reload that removes these classes.
Fixing this requires ensuring that dbus-daemon looks up the appropriate
class value on each use or upon policy reload, via userspace interfaces
such as selinux_check_access(), string_to_security_class(), and/or
selinux_set_callback(SELINUX_CB_POLICYLOAD, ...) with a callback function
that remaps the class value if needed. Other userspace policy enforcers
are believed to have been updated in recent versions but older versions
may break upon such a change.
Hence, this change renames these classes with obsolete_ prefixes and
removes all rules referencing them from refpolicy, thereby preserving
the class numbering for subsequent classes while making it clear that
these classses are no longer meaningful for modern kernels.
This change does however create a potential compatibility break for
kernels < 3.5, since the policy will cease to define the kernel class
names and therefore the kernel will handle permission checks on the
class based on the handle_unknown setting in policy. For most
Linux distributions, this will default to allow and therefore avoid
breaking userspace but will fail open. For kernels < 2.6.33 (i.e.
the dynamic class/perm discovery support), the presence of a class
in policy with the same number but a different name than the kernel
class will cause the policy load to fail entirely.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
198 lines
3.7 KiB
Plaintext
198 lines
3.7 KiB
Plaintext
# FLASK
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#
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# Define the security object classes
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#
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# Classes marked as userspace are classes
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# for userspace object managers
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class security
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class process
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class system
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class capability
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# file-related classes
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class filesystem
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class file
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class dir
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class fd
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class lnk_file
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class chr_file
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class blk_file
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class sock_file
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class fifo_file
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# network-related classes
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class socket
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class tcp_socket
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class udp_socket
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class rawip_socket
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class node
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class netif
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class netlink_socket
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class packet_socket
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class key_socket
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class unix_stream_socket
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class unix_dgram_socket
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# sysv-ipc-related classes
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class sem
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class msg
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class msgq
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class shm
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class ipc
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#
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# userspace object manager classes
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#
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# passwd/chfn/chsh
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class passwd # userspace
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# SE-X Windows stuff (more classes below)
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class x_drawable # userspace
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class x_screen # userspace
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class x_gc # userspace
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class x_font # userspace
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class x_colormap # userspace
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class x_property # userspace
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class x_selection # userspace
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class x_cursor # userspace
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class x_client # userspace
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class x_device # userspace
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class x_server # userspace
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class x_extension # userspace
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# extended netlink sockets
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class netlink_route_socket
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class obsolete_netlink_firewall_socket
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class netlink_tcpdiag_socket
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class netlink_nflog_socket
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class netlink_xfrm_socket
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class netlink_selinux_socket
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class netlink_audit_socket
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class obsolete_netlink_ip6fw_socket
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class netlink_dnrt_socket
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class dbus # userspace
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class nscd # userspace
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# IPSec association
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class association
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# Updated Netlink class for KOBJECT_UEVENT family.
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class netlink_kobject_uevent_socket
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class appletalk_socket
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class packet
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# Kernel access key retention
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class key
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class context # userspace
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class dccp_socket
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class memprotect
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class db_database # userspace
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class db_table # userspace
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class db_procedure # userspace
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class db_column # userspace
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class db_tuple # userspace
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class db_blob # userspace
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class db_exception # userspace
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class db_datatype # userspace
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# network peer labels
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class peer
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# Capabilities >= 32
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class capability2
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# More SE-X Windows stuff
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class x_resource # userspace
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class x_event # userspace
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class x_synthetic_event # userspace
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class x_application_data # userspace
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# kernel services that need to override task security, e.g. cachefiles
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class kernel_service
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class tun_socket
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class binder
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# Updated netlink classes for more recent netlink protocols.
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class netlink_iscsi_socket
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class netlink_fib_lookup_socket
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class netlink_connector_socket
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class netlink_netfilter_socket
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class netlink_generic_socket
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class netlink_scsitransport_socket
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class netlink_rdma_socket
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class netlink_crypto_socket
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# Still More SE-X Windows stuff
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class x_pointer # userspace
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class x_keyboard # userspace
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# Infiniband
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class infiniband_pkey
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class infiniband_endport
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# More Database stuff
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class db_schema # userspace
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class db_view # userspace
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class db_sequence # userspace
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class db_language # userspace
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class service # userspace
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# Capability checks when on a non-init user namespace
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class cap_userns
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class cap2_userns
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# New socket classes introduced by extended_socket_class policy capability.
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# These two were previously mapped to rawip_socket.
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class sctp_socket
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class icmp_socket
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# These were previously mapped to socket.
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class ax25_socket
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class ipx_socket
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class netrom_socket
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class atmpvc_socket
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class x25_socket
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class rose_socket
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class decnet_socket
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class atmsvc_socket
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class rds_socket
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class irda_socket
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class pppox_socket
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class llc_socket
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class can_socket
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class tipc_socket
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class bluetooth_socket
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class iucv_socket
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class rxrpc_socket
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class isdn_socket
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class phonet_socket
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class ieee802154_socket
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class caif_socket
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class alg_socket
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class nfc_socket
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class vsock_socket
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class kcm_socket
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class qipcrtr_socket
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class smc_socket
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class process2
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class bpf
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class xdp_socket
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# FLASK
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