74fd48739d
We've had a number of attempts at different NFSv4 client tracking methods over the years, but now nfsdcld has emerged as the clear winner since the others (recoverydir and the usermodehelper upcall) are problematic. As a case in point, the recoverydir backend uses MD5 hashes to encode long form clientid strings, which means that nfsd repeatedly gets dinged on FIPS audits, since MD5 isn't considered secure. Its use of MD5 is not cryptographically significant, so there is no danger there, but allowing us to compile that out allows us to sidestep the issue entirely. As a prelude to eventually removing support for these client tracking methods, add a new Kconfig option that enables them. Mark it deprecated and make it default to N. Acked-by: NeilBrown <neilb@suse.de> Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
177 lines
6.0 KiB
Plaintext
177 lines
6.0 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config NFSD
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tristate "NFS server support"
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depends on INET
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depends on FILE_LOCKING
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depends on FSNOTIFY
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select LOCKD
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select SUNRPC
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select EXPORTFS
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select NFS_ACL_SUPPORT if NFSD_V2_ACL
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select NFS_ACL_SUPPORT if NFSD_V3_ACL
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depends on MULTIUSER
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help
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Choose Y here if you want to allow other computers to access
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files residing on this system using Sun's Network File System
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protocol. To compile the NFS server support as a module,
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choose M here: the module will be called nfsd.
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You may choose to use a user-space NFS server instead, in which
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case you can choose N here.
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To export local file systems using NFS, you also need to install
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user space programs which can be found in the Linux nfs-utils
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package, available from http://linux-nfs.org/. More detail about
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the Linux NFS server implementation is available via the
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exports(5) man page.
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Below you can choose which versions of the NFS protocol are
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available to clients mounting the NFS server on this system.
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Support for NFS version 3 (RFC 1813) is always available when
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CONFIG_NFSD is selected.
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If unsure, say N.
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config NFSD_V2
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bool "NFS server support for NFS version 2 (DEPRECATED)"
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depends on NFSD
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default n
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help
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NFSv2 (RFC 1094) was the first publicly-released version of NFS.
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Unless you are hosting ancient (1990's era) NFS clients, you don't
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need this.
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If unsure, say N.
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config NFSD_V2_ACL
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bool "NFS server support for the NFSv2 ACL protocol extension"
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depends on NFSD_V2
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config NFSD_V3_ACL
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bool "NFS server support for the NFSv3 ACL protocol extension"
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depends on NFSD
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help
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Solaris NFS servers support an auxiliary NFSv3 ACL protocol that
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never became an official part of the NFS version 3 protocol.
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This protocol extension allows applications on NFS clients to
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manipulate POSIX Access Control Lists on files residing on NFS
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servers. NFS servers enforce POSIX ACLs on local files whether
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this protocol is available or not.
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This option enables support in your system's NFS server for the
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NFSv3 ACL protocol extension allowing NFS clients to manipulate
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POSIX ACLs on files exported by your system's NFS server. NFS
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clients which support the Solaris NFSv3 ACL protocol can then
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access and modify ACLs on your NFS server.
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To store ACLs on your NFS server, you also need to enable ACL-
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related CONFIG options for your local file systems of choice.
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If unsure, say N.
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config NFSD_V4
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bool "NFS server support for NFS version 4"
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depends on NFSD && PROC_FS
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select FS_POSIX_ACL
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select RPCSEC_GSS_KRB5
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select CRYPTO
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select CRYPTO_MD5
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select CRYPTO_SHA256
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select GRACE_PERIOD
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select NFS_V4_2_SSC_HELPER if NFS_V4_2
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help
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This option enables support in your system's NFS server for
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version 4 of the NFS protocol (RFC 3530).
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To export files using NFSv4, you need to install additional user
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space programs which can be found in the Linux nfs-utils package,
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available from http://linux-nfs.org/.
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If unsure, say N.
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config NFSD_PNFS
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bool
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config NFSD_BLOCKLAYOUT
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bool "NFSv4.1 server support for pNFS block layouts"
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depends on NFSD_V4 && BLOCK
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select NFSD_PNFS
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select EXPORTFS_BLOCK_OPS
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help
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This option enables support for the exporting pNFS block layouts
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in the kernel's NFS server. The pNFS block layout enables NFS
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clients to directly perform I/O to block devices accessible to both
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the server and the clients. See RFC 5663 for more details.
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If unsure, say N.
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config NFSD_SCSILAYOUT
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bool "NFSv4.1 server support for pNFS SCSI layouts"
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depends on NFSD_V4 && BLOCK
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select NFSD_PNFS
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select EXPORTFS_BLOCK_OPS
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help
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This option enables support for the exporting pNFS SCSI layouts
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in the kernel's NFS server. The pNFS SCSI layout enables NFS
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clients to directly perform I/O to SCSI devices accessible to both
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the server and the clients. See draft-ietf-nfsv4-scsi-layout for
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more details.
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If unsure, say N.
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config NFSD_FLEXFILELAYOUT
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bool "NFSv4.1 server support for pNFS Flex File layouts"
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depends on NFSD_V4
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select NFSD_PNFS
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help
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This option enables support for the exporting pNFS Flex File
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layouts in the kernel's NFS server. The pNFS Flex File layout
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enables NFS clients to directly perform I/O to NFSv3 devices
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accessible to both the server and the clients. See
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draft-ietf-nfsv4-flex-files for more details.
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Warning, this server implements the bare minimum functionality
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to be a flex file server - it is for testing the client,
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not for use in production.
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If unsure, say N.
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config NFSD_V4_2_INTER_SSC
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bool "NFSv4.2 inter server to server COPY"
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depends on NFSD_V4 && NFS_V4_2
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help
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This option enables support for NFSv4.2 inter server to
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server copy where the destination server calls the NFSv4.2
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client to read the data to copy from the source server.
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If unsure, say N.
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config NFSD_V4_SECURITY_LABEL
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bool "Provide Security Label support for NFSv4 server"
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depends on NFSD_V4 && SECURITY
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help
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Say Y here if you want enable fine-grained security label attribute
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support for NFS version 4. Security labels allow security modules like
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SELinux and Smack to label files to facilitate enforcement of their policies.
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Without this an NFSv4 mount will have the same label on each file.
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If you do not wish to enable fine-grained security labels SELinux or
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Smack policies on NFSv4 files, say N.
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config NFSD_LEGACY_CLIENT_TRACKING
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bool "Support legacy NFSv4 client tracking methods (DEPRECATED)"
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depends on NFSD_V4
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default n
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help
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The NFSv4 server needs to store a small amount of information on
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stable storage in order to handle state recovery after reboot. Most
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modern deployments upcall to a userland daemon for this (nfsdcld),
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but older NFS servers may store information directly in a
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recoverydir, or spawn a process directly using a usermodehelper
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upcall.
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These legacy client tracking methods have proven to be probelmatic
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and will be removed in the future. Say Y here if you need support
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for them in the interim.
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