[mirror_ubuntu-bionic-kernel.git] / fs / cifs / Kconfig

config CIFS
	tristate "CIFS support (advanced network filesystem, SMBFS successor)"
	depends on INET
	select NLS
	select CRYPTO
	select CRYPTO_MD4
	select CRYPTO_MD5
	select CRYPTO_HMAC
	select CRYPTO_ARC4
	select CRYPTO_ECB
	select CRYPTO_DES
	select CRYPTO_SHA256
	select CRYPTO_CMAC
	help
	  This is the client VFS module for the Common Internet File System
	  (CIFS) protocol which is the successor to the Server Message Block
	  (SMB) protocol, the native file sharing mechanism for most early
	  PC operating systems.  The CIFS protocol is fully supported by
	  file servers such as Windows 2000 (including Windows 2003, Windows 2008,
	  NT 4 and Windows XP) as well by Samba (which provides excellent CIFS
	  server support for Linux and many other operating systems). Limited
	  support for OS/2 and Windows ME and similar servers is provided as
	  well.

	  The module also provides optional support for the followon
	  protocols for CIFS including SMB3, which enables
	  useful performance and security features (see the description
	  of CONFIG_CIFS_SMB2).

	  The cifs module provides an advanced network file system
	  client for mounting to CIFS compliant servers.  It includes
	  support for DFS (hierarchical name space), secure per-user
	  session establishment via Kerberos or NTLM or NTLMv2,
	  safe distributed caching (oplock), optional packet
	  signing, Unicode and other internationalization improvements.
	  If you need to mount to Samba or Windows from this machine, say Y.

config CIFS_STATS
        bool "CIFS statistics"
        depends on CIFS
        help
          Enabling this option will cause statistics for each server share
	  mounted by the cifs client to be displayed in /proc/fs/cifs/Stats

config CIFS_STATS2
	bool "Extended statistics"
	depends on CIFS_STATS
	help
	  Enabling this option will allow more detailed statistics on SMB
	  request timing to be displayed in /proc/fs/cifs/DebugData and also
	  allow optional logging of slow responses to dmesg (depending on the
	  value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	  These additional statistics may have a minor effect on performance
	  and memory utilization.

	  Unless you are a developer or are doing network performance analysis
	  or tuning, say N.

config CIFS_WEAK_PW_HASH
	bool "Support legacy servers which use weaker LANMAN security"
	depends on CIFS
	help
	  Modern CIFS servers including Samba and most Windows versions
	  (since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	  security mechanisms. These hash the password more securely
	  than the mechanisms used in the older LANMAN version of the
	  SMB protocol but LANMAN based authentication is needed to
	  establish sessions with some old SMB servers.

	  Enabling this option allows the cifs module to mount to older
	  LANMAN based servers such as OS/2 and Windows 95, but such
	  mounts may be less secure than mounts using NTLM or more recent
	  security mechanisms if you are on a public network.  Unless you
	  have a need to access old SMB servers (and are on a private
	  network) you probably want to say N.  Even if this support
	  is enabled in the kernel build, LANMAN authentication will not be
	  used automatically. At runtime LANMAN mounts are disabled but
	  can be set to required (or optional) either in
	  /proc/fs/cifs (see fs/cifs/README for more detail) or via an
	  option on the mount command. This support is disabled by
	  default in order to reduce the possibility of a downgrade
	  attack.

	  If unsure, say N.

config CIFS_UPCALL
	bool "Kerberos/SPNEGO advanced session setup"
	depends on CIFS && KEYS
	select DNS_RESOLVER
	help
	  Enables an upcall mechanism for CIFS which accesses userspace helper
	  utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	  which are needed to mount to certain secure servers (for which more
	  secure Kerberos authentication is required). If unsure, say N.

config CIFS_XATTR
        bool "CIFS extended attributes"
        depends on CIFS
        help
          Extended attributes are name:value pairs associated with inodes by
          the kernel or by users (see the attr(5) manual page, or visit
          <http://acl.bestbits.at/> for details).  CIFS maps the name of
          extended attributes beginning with the user namespace prefix
          to SMB/CIFS EAs. EAs are stored on Windows servers without the
          user namespace prefix, but their names are seen by Linux cifs clients
          prefaced by the user namespace prefix. The system namespace
          (used by some filesystems to store ACLs) is not supported at
          this time.

          If unsure, say N.

config CIFS_POSIX
        bool "CIFS POSIX Extensions"
        depends on CIFS_XATTR
        help
          Enabling this option will cause the cifs client to attempt to
	  negotiate a newer dialect with servers, such as Samba 3.0.5
	  or later, that optionally can handle more POSIX like (rather
	  than Windows like) file behavior.  It also enables
	  support for POSIX ACLs (getfacl and setfacl) to servers
	  (such as Samba 3.10 and later) which can negotiate
	  CIFS POSIX ACL support.  If unsure, say N.

config CIFS_ACL
	  bool "Provide CIFS ACL support"
	  depends on CIFS_XATTR && KEYS
	  help
	    Allows fetching CIFS/NTFS ACL from the server.  The DACL blob
	    is handed over to the application/caller.  See the man
	    page for getcifsacl for more information.

config CIFS_DEBUG
	bool "Enable CIFS debugging routines"
	default y
	depends on CIFS
	help
	   Enabling this option adds helpful debugging messages to
	   the cifs code which increases the size of the cifs module.
	   If unsure, say Y.
config CIFS_DEBUG2
	bool "Enable additional CIFS debugging routines"
	depends on CIFS_DEBUG
	help
	   Enabling this option adds a few more debugging routines
	   to the cifs code which slightly increases the size of
	   the cifs module and can cause additional logging of debug
	   messages in some error paths, slowing performance. This
	   option can be turned off unless you are debugging
	   cifs problems.  If unsure, say N.

config CIFS_DFS_UPCALL
	  bool "DFS feature support"
	  depends on CIFS && KEYS
	  select DNS_RESOLVER
	  help
	    Distributed File System (DFS) support is used to access shares
	    transparently in an enterprise name space, even if the share
	    moves to a different server.  This feature also enables
	    an upcall mechanism for CIFS which contacts userspace helper
	    utilities to provide server name resolution (host names to
	    IP addresses) which is needed for implicit mounts of DFS junction
	    points. If unsure, say N.

config CIFS_NFSD_EXPORT
	  bool "Allow nfsd to export CIFS file system"
	  depends on CIFS && BROKEN
	  help
	   Allows NFS server to export a CIFS mounted share (nfsd over cifs)

config CIFS_SMB2
	bool "SMB2 and SMB3 network file system support"
	depends on CIFS && INET
	select NLS
	select KEYS
	select FSCACHE
	select DNS_RESOLVER

	help
	  This enables support for the Server Message Block version 2
	  family of protocols, including SMB3.  SMB3 support is
	  enabled on mount by specifying "vers=3.0" in the mount
	  options. These protocols are the successors to the popular
	  CIFS and SMB network file sharing protocols. SMB3 is the
	  native file sharing mechanism for the more recent
	  versions of Windows (Windows 8 and Windows 2012 and
	  later) and Samba server and many others support SMB3 well.
	  In general SMB3 enables better performance, security
	  and features, than would be possible with CIFS (Note that
	  when mounting to Samba, due to the CIFS POSIX extensions,
	  CIFS mounts can provide slightly better POSIX compatibility
	  than SMB3 mounts do though). Note that SMB2/SMB3 mount
	  options are also slightly simpler (compared to CIFS) due
	  to protocol improvements.

config CIFS_SMB311
	bool "SMB3.1.1 network file system support (Experimental)"
	depends on CIFS_SMB2 && INET

	help
	  This enables experimental support for the newest, SMB3.1.1, dialect.
	  This dialect includes improved security negotiation features.
	  If unsure, say N

config CIFS_FSCACHE
	  bool "Provide CIFS client caching support"
	  depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
	  help
	    Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	    to be cached locally on disk through the general filesystem cache
	    manager. If unsure, say N.
Commit	Line	Data
bb26b963 AD	1	config CIFS
	2	tristate "CIFS support (advanced network filesystem, SMBFS successor)"
	3	depends on INET
	4	select NLS
d2b91521	5	select CRYPTO
f855f6cb	6	select CRYPTO_MD4
d2b91521	7	select CRYPTO_MD5
362d3129	8	select CRYPTO_HMAC
d2b91521	9	select CRYPTO_ARC4
5f0b23ee	10	select CRYPTO_ECB
43988d76	11	select CRYPTO_DES
3c1bf7e4	12	select CRYPTO_SHA256
429b46f4	13	select CRYPTO_CMAC
bb26b963 AD	14	help
	15	This is the client VFS module for the Common Internet File System
	16	(CIFS) protocol which is the successor to the Server Message Block
	17	(SMB) protocol, the native file sharing mechanism for most early
	18	PC operating systems. The CIFS protocol is fully supported by
1d4ab907 SF	19	file servers such as Windows 2000 (including Windows 2003, Windows 2008,
1d4ab907 SF	20	NT 4 and Windows XP) as well by Samba (which provides excellent CIFS
bb26b963 AD	21	server support for Linux and many other operating systems). Limited
	22	support for OS/2 and Windows ME and similar servers is provided as
	23	well.
	24
ca5d13fc SF	25	The module also provides optional support for the followon
	26	protocols for CIFS including SMB3, which enables
	27	useful performance and security features (see the description
	28	of CONFIG_CIFS_SMB2).
	29
bb26b963 AD	30	The cifs module provides an advanced network file system
	31	client for mounting to CIFS compliant servers. It includes
	32	support for DFS (hierarchical name space), secure per-user
	33	session establishment via Kerberos or NTLM or NTLMv2,
	34	safe distributed caching (oplock), optional packet
	35	signing, Unicode and other internationalization improvements.
	36	If you need to mount to Samba or Windows from this machine, say Y.
	37
	38	config CIFS_STATS
	39	bool "CIFS statistics"
	40	depends on CIFS
	41	help
	42	Enabling this option will cause statistics for each server share
	43	mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
	44
	45	config CIFS_STATS2
	46	bool "Extended statistics"
	47	depends on CIFS_STATS
	48	help
	49	Enabling this option will allow more detailed statistics on SMB
	50	request timing to be displayed in /proc/fs/cifs/DebugData and also
	51	allow optional logging of slow responses to dmesg (depending on the
	52	value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	53	These additional statistics may have a minor effect on performance
	54	and memory utilization.
	55
	56	Unless you are a developer or are doing network performance analysis
	57	or tuning, say N.
	58
	59	config CIFS_WEAK_PW_HASH
	60	bool "Support legacy servers which use weaker LANMAN security"
	61	depends on CIFS
	62	help
	63	Modern CIFS servers including Samba and most Windows versions
	64	(since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	65	security mechanisms. These hash the password more securely
	66	than the mechanisms used in the older LANMAN version of the
	67	SMB protocol but LANMAN based authentication is needed to
	68	establish sessions with some old SMB servers.
	69
	70	Enabling this option allows the cifs module to mount to older
	71	LANMAN based servers such as OS/2 and Windows 95, but such
	72	mounts may be less secure than mounts using NTLM or more recent
	73	security mechanisms if you are on a public network. Unless you
	74	have a need to access old SMB servers (and are on a private
	75	network) you probably want to say N. Even if this support
	76	is enabled in the kernel build, LANMAN authentication will not be
	77	used automatically. At runtime LANMAN mounts are disabled but
	78	can be set to required (or optional) either in
	79	/proc/fs/cifs (see fs/cifs/README for more detail) or via an
	80	option on the mount command. This support is disabled by
	81	default in order to reduce the possibility of a downgrade
	82	attack.
	83
	84	If unsure, say N.
	85
	86	config CIFS_UPCALL
1a4240f4 WL	87	bool "Kerberos/SPNEGO advanced session setup"
	88	depends on CIFS && KEYS
	89	select DNS_RESOLVER
	90	help
	91	Enables an upcall mechanism for CIFS which accesses userspace helper
	92	utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	93	which are needed to mount to certain secure servers (for which more
	94	secure Kerberos authentication is required). If unsure, say N.
bb26b963 AD	95
	96	config CIFS_XATTR
	97	bool "CIFS extended attributes"
	98	depends on CIFS
	99	help
	100	Extended attributes are name:value pairs associated with inodes by
	101	the kernel or by users (see the attr(5) manual page, or visit
	102	<http://acl.bestbits.at/> for details). CIFS maps the name of
	103	extended attributes beginning with the user namespace prefix
	104	to SMB/CIFS EAs. EAs are stored on Windows servers without the
	105	user namespace prefix, but their names are seen by Linux cifs clients
	106	prefaced by the user namespace prefix. The system namespace
	107	(used by some filesystems to store ACLs) is not supported at
	108	this time.
	109
	110	If unsure, say N.
	111
	112	config CIFS_POSIX
	113	bool "CIFS POSIX Extensions"
	114	depends on CIFS_XATTR
	115	help
	116	Enabling this option will cause the cifs client to attempt to
	117	negotiate a newer dialect with servers, such as Samba 3.0.5
	118	or later, that optionally can handle more POSIX like (rather
	119	than Windows like) file behavior. It also enables
	120	support for POSIX ACLs (getfacl and setfacl) to servers
	121	(such as Samba 3.10 and later) which can negotiate
	122	CIFS POSIX ACL support. If unsure, say N.
	123
1d4ab907 SF	124	config CIFS_ACL
	125	bool "Provide CIFS ACL support"
	126	depends on CIFS_XATTR && KEYS
	127	help
	128	Allows fetching CIFS/NTFS ACL from the server. The DACL blob
ca5d13fc SF	129	is handed over to the application/caller. See the man
ca5d13fc SF	130	page for getcifsacl for more information.
1d4ab907	131
471b1f98 JP	132	config CIFS_DEBUG
	133	bool "Enable CIFS debugging routines"
	134	default y
	135	depends on CIFS
	136	help
	137	Enabling this option adds helpful debugging messages to
	138	the cifs code which increases the size of the cifs module.
	139	If unsure, say Y.
bb26b963 AD	140	config CIFS_DEBUG2
bb26b963 AD	141	bool "Enable additional CIFS debugging routines"
471b1f98	142	depends on CIFS_DEBUG
bb26b963 AD	143	help
	144	Enabling this option adds a few more debugging routines
	145	to the cifs code which slightly increases the size of
	146	the cifs module and can cause additional logging of debug
	147	messages in some error paths, slowing performance. This
	148	option can be turned off unless you are debugging
	149	cifs problems. If unsure, say N.
	150
10e70afa SF	151	config CIFS_DFS_UPCALL
	152	bool "DFS feature support"
	153	depends on CIFS && KEYS
1a4240f4	154	select DNS_RESOLVER
10e70afa SF	155	help
	156	Distributed File System (DFS) support is used to access shares
	157	transparently in an enterprise name space, even if the share
	158	moves to a different server. This feature also enables
	159	an upcall mechanism for CIFS which contacts userspace helper
	160	utilities to provide server name resolution (host names to
	161	IP addresses) which is needed for implicit mounts of DFS junction
	162	points. If unsure, say N.
	163
25720873	164	config CIFS_NFSD_EXPORT
00f3616b KC	165	bool "Allow nfsd to export CIFS file system"
00f3616b KC	166	depends on CIFS && BROKEN
bb26b963	167	help
25720873	168	Allows NFS server to export a CIFS mounted share (nfsd over cifs)
675f36fb SF	169
675f36fb SF	170	config CIFS_SMB2
ca5d13fc	171	bool "SMB2 and SMB3 network file system support"
00f3616b	172	depends on CIFS && INET
675f36fb SF	173	select NLS
	174	select KEYS
	175	select FSCACHE
	176	select DNS_RESOLVER
	177
	178	help
ca5d13fc SF	179	This enables support for the Server Message Block version 2
	180	family of protocols, including SMB3. SMB3 support is
	181	enabled on mount by specifying "vers=3.0" in the mount
	182	options. These protocols are the successors to the popular
	183	CIFS and SMB network file sharing protocols. SMB3 is the
	184	native file sharing mechanism for the more recent
	185	versions of Windows (Windows 8 and Windows 2012 and
	186	later) and Samba server and many others support SMB3 well.
	187	In general SMB3 enables better performance, security
	188	and features, than would be possible with CIFS (Note that
	189	when mounting to Samba, due to the CIFS POSIX extensions,
	190	CIFS mounts can provide slightly better POSIX compatibility
	191	than SMB3 mounts do though). Note that SMB2/SMB3 mount
	192	options are also slightly simpler (compared to CIFS) due
	193	to protocol improvements.
1d4ab907	194
5f7fbf73 SF	195	config CIFS_SMB311
	196	bool "SMB3.1.1 network file system support (Experimental)"
	197	depends on CIFS_SMB2 && INET
	198
	199	help
	200	This enables experimental support for the newest, SMB3.1.1, dialect.
	201	This dialect includes improved security negotiation features.
	202	If unsure, say N
	203
1d4ab907 SF	204	config CIFS_FSCACHE
	205	bool "Provide CIFS client caching support"
	206	depends on CIFS=m && FSCACHE \|\| CIFS=y && FSCACHE=y
	207	help
	208	Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	209	to be cached locally on disk through the general filesystem cache
	210	manager. If unsure, say N.
	211