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NFS is well suited for sharing entire file systems with a large number of known hosts in a transparent manner. However, with ease of use comes a variety of potential security problems.
The following points should be considered when exporting NFS file systems on a server or mounting them on a client. Doing so minimizes NFS security risks and better protects data on the server.
Depending on which version of NFS you plan to implement, depends on your existing network environment, and your security concerns. The following sections explain the differences between implementing security measures with NFSv2, NFSv3, and NFSv4. If at all possible, use of NFSv4 is recommended over other versions of NFS.
NFS controls who can mount an exported file system based on the host making the mount request, not the user that actually uses the file system. Hosts must be given explicit rights to mount the exported file system. Access control is not possible for users, other than through file and directory permissions. In other words, once a file system is exported via NFS, any user on any remote host connected to the NFS server can access the shared data. To limit the potential risks, administrators often allow read-only access or squash user permissions to a common user and group ID. Unfortunately, these solutions prevent the NFS share from being used in the way it was originally intended.
Additionally, if an attacker gains control of the DNS server used by the system exporting the NFS file system, the system associated with a particular hostname or fully qualified domain name can be pointed to an unauthorized machine. At this point, the unauthorized machine is the system permitted to mount the NFS share, since no username or password information is exchanged to provide additional security for the NFS mount.
I've already tried to tune the NFS connection on the Mac by editing /etc/nfs.conf nfs.client.allowasync = 1 nfs.client.nfsiodthreadmax = 128 With these settings I'm at least up from previously 15MB/s to now 25MB/s. Allegro NFS Server 4.5 is a professional and useful tool that enables Windows NT workstations and servers to perform as NFS servers.Major Features:Interoperates with NFS clients on Solaris, FreeBSD, AIX, HP-UX, IRIX, Tru64, Mac OS X and other NFS.
Wildcards should be used sparingly when exporting directories via NFS as it is possible for the scope of the wildcard to encompass more systems than intended.
It is also possible to restrict access to the portmap service via TCP wrappers. Access to ports used by portmap, rpc.mountd, and rpc.nfsd can also be limited by creating firewall rules with iptables.
- Red Hat Enterprise Linux uses a combination of kernel-level support and daemon processes to provide NFS file sharing. NFSv2 and NFSv3 rely on Remote Procedure Calls (RPC) to encode and decode requests between clients and servers.RPC services under Linux are controlled by the portmap service. To share or mount NFS file systems, the following services work together, depending on which version of.
- This covers the steps necessary to export filesystems on Mac OS X via NFS. This was originally written in the 10.1 days, but is still applicable as of 10.4.2 (non-server versions). Like setting up a client, configuring OS X to be a server involves updating NetInfo.
- The most popular versions of NFS Manager for Mac are 3.7, 3.6 and 3.5. From the developer: NFS Manager is a graphical user interface to control all built-in NFS features of Mac OS X. It can manage a whole network of Mac OS X computers to setup a distributed NFS file.
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For more information on securing NFS and portmap, refer to Section 42.9, “IPTables”.
The release of NFSv4 brought a revolution to authentication and security to NFS exports. NFSv4 mandates the implementation of the RPCSEC_GSS kernel module, the Kerberos version 5 GSS-API mechanism, SPKM-3, and LIPKEY. With NFSv4, the mandatory security mechanisms are oriented towards authenticating individual users, and not client machines as used in NFSv2 and NFSv3.
Note
It is assumed that a Kerberos ticket-granting server (KDC) is installed and configured correctly, prior to configuring an NFSv4 server. Kerberos is a network authentication system which allows clients and servers to authenticate to each other through use of symmetric encryption and a trusted third party, the KDC.
NFSv4 includes ACL support based on the Microsoft Windows NT model, not the POSIX model, because of its features and because it is widely deployed. NFSv2 and NFSv3 do not have support for native ACL attributes.
Another important security feature of NFSv4 is its removal of the rpc.mountd daemon. The rpc.mountd daemon presented possible security holes because of the way it dealt with filehandlers.
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For more information on the RPCSEC_GSS framework, including how rpc.svcgssd and rpc.gssd inter operate, refer to http://www.citi.umich.edu/projects/nfsv4/gssd/.
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Once the NFS file system is mounted read/write by a remote host, the only protection each shared file has is its permissions. If two users that share the same user ID value mount the same NFS file system, they can modify each others files. Additionally, anyone logged in as root on the client system can use the su - command to become a user who could access particular files via the NFS share.
By default, access control lists (ACLs) are supported by NFS under Red Hat Enterprise Linux. It is not recommended that this feature be disabled.
The default behavior when exporting a file system via NFS is to use root squashing. This sets the user ID of anyone accessing the NFS share as the root user on their local machine to a value of the server's nfsnobody account. Never turn off root squashing.
If exporting an NFS share as read-only, consider using the all_squash option, which makes every user accessing the exported file system take the user ID of the nfsnobody user.