fs/cifs/Kconfig

   1 config CIFS
   2         tristate "CIFS support (advanced network filesystem, SMBFS successor)"
   3         depends on INET
   4         select NLS
   5         select CRYPTO
   6         select CRYPTO_MD4
   7         select CRYPTO_MD5
   8         select CRYPTO_HMAC
   9         select CRYPTO_ARC4
  10         select CRYPTO_ECB
  11         select CRYPTO_DES
  12         help
  13           This is the client VFS module for the Common Internet File System
  14           (CIFS) protocol which is the successor to the Server Message Block
  15           (SMB) protocol, the native file sharing mechanism for most early
  16           PC operating systems.  The CIFS protocol is fully supported by
  17           file servers such as Windows 2000 (including Windows 2003, Windows 2008,
  18           NT 4 and Windows XP) as well by Samba (which provides excellent CIFS
  19           server support for Linux and many other operating systems). Limited
  20           support for OS/2 and Windows ME and similar servers is provided as
  21           well.
  22
  23           The module also provides optional support for the followon
  24           protocols for CIFS including SMB3, which enables
  25           useful performance and security features (see the description
  26           of CONFIG_CIFS_SMB2).
  27
  28           The cifs module provides an advanced network file system
  29           client for mounting to CIFS compliant servers.  It includes
  30           support for DFS (hierarchical name space), secure per-user
  31           session establishment via Kerberos or NTLM or NTLMv2,
  32           safe distributed caching (oplock), optional packet
  33           signing, Unicode and other internationalization improvements.
  34           If you need to mount to Samba or Windows from this machine, say Y.
  35
  36 config CIFS_STATS
  37         bool "CIFS statistics"
  38         depends on CIFS
  39         help
  40           Enabling this option will cause statistics for each server share
  41           mounted by the cifs client to be displayed in /proc/fs/cifs/Stats
  42
  43 config CIFS_STATS2
  44         bool "Extended statistics"
  45         depends on CIFS_STATS
  46         help
  47           Enabling this option will allow more detailed statistics on SMB
  48           request timing to be displayed in /proc/fs/cifs/DebugData and also
  49           allow optional logging of slow responses to dmesg (depending on the
  50           value of /proc/fs/cifs/cifsFYI, see fs/cifs/README for more details).
  51           These additional statistics may have a minor effect on performance
  52           and memory utilization.
  53
  54           Unless you are a developer or are doing network performance analysis
  55           or tuning, say N.
  56
  57 config CIFS_WEAK_PW_HASH
  58         bool "Support legacy servers which use weaker LANMAN security"
  59         depends on CIFS
  60         help
  61           Modern CIFS servers including Samba and most Windows versions
  62           (since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
  63           security mechanisms. These hash the password more securely
  64           than the mechanisms used in the older LANMAN version of the
  65           SMB protocol but LANMAN based authentication is needed to
  66           establish sessions with some old SMB servers.
  67
  68           Enabling this option allows the cifs module to mount to older
  69           LANMAN based servers such as OS/2 and Windows 95, but such
  70           mounts may be less secure than mounts using NTLM or more recent
  71           security mechanisms if you are on a public network.  Unless you
  72           have a need to access old SMB servers (and are on a private
  73           network) you probably want to say N.  Even if this support
  74           is enabled in the kernel build, LANMAN authentication will not be
  75           used automatically. At runtime LANMAN mounts are disabled but
  76           can be set to required (or optional) either in
  77           /proc/fs/cifs (see fs/cifs/README for more detail) or via an
  78           option on the mount command. This support is disabled by
  79           default in order to reduce the possibility of a downgrade
  80           attack.
  81
  82           If unsure, say N.
  83
  84 config CIFS_UPCALL
  85         bool "Kerberos/SPNEGO advanced session setup"
  86         depends on CIFS && KEYS
  87         select DNS_RESOLVER
  88         help
  89           Enables an upcall mechanism for CIFS which accesses userspace helper
  90           utilities to provide SPNEGO packaged (RFC 4178) Kerberos tickets
  91           which are needed to mount to certain secure servers (for which more
  92           secure Kerberos authentication is required). If unsure, say N.
  93
  94 config CIFS_XATTR
  95         bool "CIFS extended attributes"
  96         depends on CIFS
  97         help
  98           Extended attributes are name:value pairs associated with inodes by
  99           the kernel or by users (see the attr(5) manual page, or visit
 100           <http://acl.bestbits.at/> for details).  CIFS maps the name of
 101           extended attributes beginning with the user namespace prefix
 102           to SMB/CIFS EAs. EAs are stored on Windows servers without the
 103           user namespace prefix, but their names are seen by Linux cifs clients
 104           prefaced by the user namespace prefix. The system namespace
 105           (used by some filesystems to store ACLs) is not supported at
 106           this time.
 107
 108           If unsure, say N.
 109
 110 config CIFS_POSIX
 111         bool "CIFS POSIX Extensions"
 112         depends on CIFS_XATTR
 113         help
 114           Enabling this option will cause the cifs client to attempt to
 115           negotiate a newer dialect with servers, such as Samba 3.0.5
 116           or later, that optionally can handle more POSIX like (rather
 117           than Windows like) file behavior.  It also enables
 118           support for POSIX ACLs (getfacl and setfacl) to servers
 119           (such as Samba 3.10 and later) which can negotiate
 120           CIFS POSIX ACL support.  If unsure, say N.
 121
 122 config CIFS_ACL
 123           bool "Provide CIFS ACL support"
 124           depends on CIFS_XATTR && KEYS
 125           help
 126             Allows fetching CIFS/NTFS ACL from the server.  The DACL blob
 127             is handed over to the application/caller.  See the man
 128             page for getcifsacl for more information.
 129
 130 config CIFS_DEBUG
 131         bool "Enable CIFS debugging routines"
 132         default y
 133         depends on CIFS
 134         help
 135            Enabling this option adds helpful debugging messages to
 136            the cifs code which increases the size of the cifs module.
 137            If unsure, say Y.
 138 config CIFS_DEBUG2
 139         bool "Enable additional CIFS debugging routines"
 140         depends on CIFS_DEBUG
 141         help
 142            Enabling this option adds a few more debugging routines
 143            to the cifs code which slightly increases the size of
 144            the cifs module and can cause additional logging of debug
 145            messages in some error paths, slowing performance. This
 146            option can be turned off unless you are debugging
 147            cifs problems.  If unsure, say N.
 148
 149 config CIFS_DFS_UPCALL
 150           bool "DFS feature support"
 151           depends on CIFS && KEYS
 152           select DNS_RESOLVER
 153           help
 154             Distributed File System (DFS) support is used to access shares
 155             transparently in an enterprise name space, even if the share
 156             moves to a different server.  This feature also enables
 157             an upcall mechanism for CIFS which contacts userspace helper
 158             utilities to provide server name resolution (host names to
 159             IP addresses) which is needed for implicit mounts of DFS junction
 160             points. If unsure, say N.
 161
 162 config CIFS_NFSD_EXPORT
 163           bool "Allow nfsd to export CIFS file system"
 164           depends on CIFS && BROKEN
 165           help
 166            Allows NFS server to export a CIFS mounted share (nfsd over cifs)
 167
 168 config CIFS_SMB2
 169         bool "SMB2 and SMB3 network file system support"
 170         depends on CIFS
 171         select KEYS
 172         select FSCACHE
 173         select DNS_RESOLVER
 174         select CRYPTO_AES
 175         select CRYPTO_SHA256
 176         select CRYPTO_CMAC
 177         select CRYPTO_AEAD2
 178         select CRYPTO_CCM
 179
 180         help
 181           This enables support for the Server Message Block version 2
 182           family of protocols, including SMB3.  SMB3 support is
 183           enabled on mount by specifying "vers=3.0" in the mount
 184           options. These protocols are the successors to the popular
 185           CIFS and SMB network file sharing protocols. SMB3 is the
 186           native file sharing mechanism for the more recent
 187           versions of Windows (Windows 8 and Windows 2012 and
 188           later) and Samba server and many others support SMB3 well.
 189           In general SMB3 enables better performance, security
 190           and features, than would be possible with CIFS (Note that
 191           when mounting to Samba, due to the CIFS POSIX extensions,
 192           CIFS mounts can provide slightly better POSIX compatibility
 193           than SMB3 mounts do though). Note that SMB2/SMB3 mount
 194           options are also slightly simpler (compared to CIFS) due
 195           to protocol improvements.
 196
 197 config CIFS_SMB311
 198         bool "SMB3.1.1 network file system support (Experimental)"
 199         depends on CIFS_SMB2
 200
 201         help
 202           This enables experimental support for the newest, SMB3.1.1, dialect.
 203           This dialect includes improved security negotiation features.
 204           If unsure, say N
 205
 206 config CIFS_FSCACHE
 207           bool "Provide CIFS client caching support"
 208           depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y
 209           help
 210             Makes CIFS FS-Cache capable. Say Y here if you want your CIFS data
 211             to be cached locally on disk through the general filesystem cache
 212             manager. If unsure, say N.
 213