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

config CIFS
	tristate "SMB3 and CIFS support (advanced network filesystem)"
	depends on INET
	select NLS
	select CRYPTO
	select CRYPTO_MD4
	select CRYPTO_MD5
	select CRYPTO_SHA256
	select CRYPTO_CMAC
	select CRYPTO_HMAC
	select CRYPTO_ARC4
	select CRYPTO_AEAD2
	select CRYPTO_CCM
	select CRYPTO_ECB
	select CRYPTO_AES
	select CRYPTO_DES
	help
	  This is the client VFS module for the SMB3 family of NAS protocols,
	  as well as for earlier dialects such as SMB2.1, SMB2 and the
	  Common Internet File System (CIFS) protocol.  CIFS was the successor
	  to the original dialect, the Server Message Block (SMB) protocol, the
	  native file sharing mechanism for most early PC operating systems.

	  The SMB3 protocol is supported by most modern operating systems and
	  NAS appliances (e.g. Samba, Windows 8, Windows 2012, MacOS).
	  The older CIFS protocol was included in Windows NT4, 2000 and XP (and
	  later) as well by Samba (which provides excellent CIFS and SMB3
	  server support for Linux and many other operating systems). Limited
	  support for OS/2 and Windows ME and similar very old servers is
	  provided as well.

	  The cifs module provides an advanced network file system client
	  for mounting to SMB3 (and 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.

	  In general, the default dialects, SMB3 and later, enable 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. SMB2/SMB3 mount options are also
	  slightly simpler (compared to CIFS) due to protocol improvements.

	  If you need to mount to Samba, Macs 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 Y.

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 Y.

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.  If unsure, say Y.

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_DEBUG_DUMP_KEYS
	bool "Dump encryption keys for offline decryption (Unsafe)"
	depends on CIFS_DEBUG
	help
	   Enabling this will dump the encryption and decryption keys
	   used to communicate on an encrypted share connection on the
	   console. This allows Wireshark to decrypt and dissect
	   encrypted network captures. Enable this carefully.
	   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 Y.

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_SMB311
	bool "SMB3.1.1 network file system support (Experimental)"
	depends on CIFS

	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	1	config CIFS
2a38e120	2	tristate "SMB3 and CIFS support (advanced network filesystem)"
bb26b963 AD	3	depends on INET
bb26b963 AD	4	select NLS
d2b91521	5	select CRYPTO
f855f6cb	6	select CRYPTO_MD4
d2b91521	7	select CRYPTO_MD5
3b58caca BG	8	select CRYPTO_SHA256
3b58caca BG	9	select CRYPTO_CMAC
362d3129	10	select CRYPTO_HMAC
d2b91521	11	select CRYPTO_ARC4
3b58caca BG	12	select CRYPTO_AEAD2
3b58caca BG	13	select CRYPTO_CCM
5f0b23ee	14	select CRYPTO_ECB
3b58caca	15	select CRYPTO_AES
43988d76	16	select CRYPTO_DES
bb26b963	17	help
2a38e120 SF	18	This is the client VFS module for the SMB3 family of NAS protocols,
	19	as well as for earlier dialects such as SMB2.1, SMB2 and the
	20	Common Internet File System (CIFS) protocol. CIFS was the successor
	21	to the original dialect, the Server Message Block (SMB) protocol, the
	22	native file sharing mechanism for most early PC operating systems.
	23
	24	The SMB3 protocol is supported by most modern operating systems and
	25	NAS appliances (e.g. Samba, Windows 8, Windows 2012, MacOS).
	26	The older CIFS protocol was included in Windows NT4, 2000 and XP (and
	27	later) as well by Samba (which provides excellent CIFS and SMB3
bb26b963	28	server support for Linux and many other operating systems). Limited
2a38e120 SF	29	support for OS/2 and Windows ME and similar very old servers is
2a38e120 SF	30	provided as well.
bb26b963	31
2a38e120 SF	32	The cifs module provides an advanced network file system client
2a38e120 SF	33	for mounting to SMB3 (and CIFS) compliant servers. It includes
bb26b963 AD	34	support for DFS (hierarchical name space), secure per-user
	35	session establishment via Kerberos or NTLM or NTLMv2,
	36	safe distributed caching (oplock), optional packet
	37	signing, Unicode and other internationalization improvements.
2a38e120 SF	38
	39	In general, the default dialects, SMB3 and later, enable better
	40	performance, security and features, than would be possible with CIFS.
	41	Note that when mounting to Samba, due to the CIFS POSIX extensions,
	42	CIFS mounts can provide slightly better POSIX compatibility
	43	than SMB3 mounts. SMB2/SMB3 mount options are also
	44	slightly simpler (compared to CIFS) due to protocol improvements.
	45
	46	If you need to mount to Samba, Macs or Windows from this machine, say Y.
bb26b963 AD	47
	48	config CIFS_STATS
	49	bool "CIFS statistics"
	50	depends on CIFS
	51	help
	52	Enabling this option will cause statistics for each server share
	53	mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
	54
	55	config CIFS_STATS2
	56	bool "Extended statistics"
	57	depends on CIFS_STATS
	58	help
	59	Enabling this option will allow more detailed statistics on SMB
	60	request timing to be displayed in /proc/fs/cifs/DebugData and also
	61	allow optional logging of slow responses to dmesg (depending on the
	62	value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
	63	These additional statistics may have a minor effect on performance
	64	and memory utilization.
	65
	66	Unless you are a developer or are doing network performance analysis
	67	or tuning, say N.
	68
	69	config CIFS_WEAK_PW_HASH
	70	bool "Support legacy servers which use weaker LANMAN security"
	71	depends on CIFS
	72	help
	73	Modern CIFS servers including Samba and most Windows versions
	74	(since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
	75	security mechanisms. These hash the password more securely
	76	than the mechanisms used in the older LANMAN version of the
	77	SMB protocol but LANMAN based authentication is needed to
	78	establish sessions with some old SMB servers.
	79
	80	Enabling this option allows the cifs module to mount to older
	81	LANMAN based servers such as OS/2 and Windows 95, but such
	82	mounts may be less secure than mounts using NTLM or more recent
	83	security mechanisms if you are on a public network. Unless you
	84	have a need to access old SMB servers (and are on a private
	85	network) you probably want to say N. Even if this support
	86	is enabled in the kernel build, LANMAN authentication will not be
	87	used automatically. At runtime LANMAN mounts are disabled but
	88	can be set to required (or optional) either in
	89	/proc/fs/cifs (see fs/cifs/README for more detail) or via an
	90	option on the mount command. This support is disabled by
	91	default in order to reduce the possibility of a downgrade
	92	attack.
	93
	94	If unsure, say N.
	95
	96	config CIFS_UPCALL
1a4240f4 WL	97	bool "Kerberos/SPNEGO advanced session setup"
	98	depends on CIFS && KEYS
	99	select DNS_RESOLVER
	100	help
	101	Enables an upcall mechanism for CIFS which accesses userspace helper
	102	utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
	103	which are needed to mount to certain secure servers (for which more
2a38e120	104	secure Kerberos authentication is required). If unsure, say Y.
bb26b963 AD	105
	106	config CIFS_XATTR
	107	bool "CIFS extended attributes"
	108	depends on CIFS
	109	help
	110	Extended attributes are name:value pairs associated with inodes by
	111	the kernel or by users (see the attr(5) manual page, or visit
	112	<http://acl.bestbits.at/> for details). CIFS maps the name of
	113	extended attributes beginning with the user namespace prefix
	114	to SMB/CIFS EAs. EAs are stored on Windows servers without the
	115	user namespace prefix, but their names are seen by Linux cifs clients
	116	prefaced by the user namespace prefix. The system namespace
	117	(used by some filesystems to store ACLs) is not supported at
	118	this time.
	119
2a38e120	120	If unsure, say Y.
bb26b963 AD	121
	122	config CIFS_POSIX
	123	bool "CIFS POSIX Extensions"
	124	depends on CIFS_XATTR
	125	help
	126	Enabling this option will cause the cifs client to attempt to
	127	negotiate a newer dialect with servers, such as Samba 3.0.5
	128	or later, that optionally can handle more POSIX like (rather
	129	than Windows like) file behavior. It also enables
	130	support for POSIX ACLs (getfacl and setfacl) to servers
	131	(such as Samba 3.10 and later) which can negotiate
	132	CIFS POSIX ACL support. If unsure, say N.
	133
1d4ab907 SF	134	config CIFS_ACL
	135	bool "Provide CIFS ACL support"
	136	depends on CIFS_XATTR && KEYS
	137	help
	138	Allows fetching CIFS/NTFS ACL from the server. The DACL blob
ca5d13fc	139	is handed over to the application/caller. See the man
2a38e120	140	page for getcifsacl for more information. If unsure, say Y.
1d4ab907	141
471b1f98 JP	142	config CIFS_DEBUG
	143	bool "Enable CIFS debugging routines"
	144	default y
	145	depends on CIFS
	146	help
	147	Enabling this option adds helpful debugging messages to
	148	the cifs code which increases the size of the cifs module.
	149	If unsure, say Y.
bb26b963 AD	150	config CIFS_DEBUG2
bb26b963 AD	151	bool "Enable additional CIFS debugging routines"
471b1f98	152	depends on CIFS_DEBUG
bb26b963 AD	153	help
	154	Enabling this option adds a few more debugging routines
	155	to the cifs code which slightly increases the size of
	156	the cifs module and can cause additional logging of debug
	157	messages in some error paths, slowing performance. This
	158	option can be turned off unless you are debugging
	159	cifs problems. If unsure, say N.
	160
d38de3c6 AA	161	config CIFS_DEBUG_DUMP_KEYS
d38de3c6 AA	162	bool "Dump encryption keys for offline decryption (Unsafe)"
2a38e120	163	depends on CIFS_DEBUG
d38de3c6 AA	164	help
	165	Enabling this will dump the encryption and decryption keys
	166	used to communicate on an encrypted share connection on the
	167	console. This allows Wireshark to decrypt and dissect
	168	encrypted network captures. Enable this carefully.
2a38e120	169	If unsure, say N.
d38de3c6	170
10e70afa SF	171	config CIFS_DFS_UPCALL
	172	bool "DFS feature support"
	173	depends on CIFS && KEYS
1a4240f4	174	select DNS_RESOLVER
10e70afa SF	175	help
	176	Distributed File System (DFS) support is used to access shares
	177	transparently in an enterprise name space, even if the share
	178	moves to a different server. This feature also enables
	179	an upcall mechanism for CIFS which contacts userspace helper
	180	utilities to provide server name resolution (host names to
	181	IP addresses) which is needed for implicit mounts of DFS junction
2a38e120	182	points. If unsure, say Y.
10e70afa	183
25720873	184	config CIFS_NFSD_EXPORT
00f3616b KC	185	bool "Allow nfsd to export CIFS file system"
00f3616b KC	186	depends on CIFS && BROKEN
bb26b963	187	help
25720873	188	Allows NFS server to export a CIFS mounted share (nfsd over cifs)
675f36fb	189
5f7fbf73 SF	190	config CIFS_SMB311
5f7fbf73 SF	191	bool "SMB3.1.1 network file system support (Experimental)"
2a38e120	192	depends on CIFS
5f7fbf73 SF	193
	194	help
	195	This enables experimental support for the newest, SMB3.1.1, dialect.
	196	This dialect includes improved security negotiation features.
	197	If unsure, say N
	198
1d4ab907 SF	199	config CIFS_FSCACHE
	200	bool "Provide CIFS client caching support"
	201	depends on CIFS=m && FSCACHE \|\| CIFS=y && FSCACHE=y
	202	help
	203	Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
	204	to be cached locally on disk through the general filesystem cache
	205	manager. If unsure, say N.
	206