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OpenSolaris 2009.06 - man page for nfssec (opensolaris section 5)

nfssec(5)		       Standards, Environments, and Macros			nfssec(5)

       nfssec - overview of NFS security modes

       The  mount_nfs(1M)  and	share_nfs(1M) commands each provide a way to specify the security
       mode to be used on an NFS file system through the sec=mode option. mode can  be	sys,  dh,
       krb5, krb5i, krb5p, or none. These security modes can also be added to the automount maps.
       Note  that  mount_nfs(1M)  and  automount(1M)  do  not  support	sec=none  at  this  time.
       mount_nfs(1M)  allows  you  to specify a single security mode; share_nfs(1M) allows you to
       specify multiple modes (or none). With multiple modes, an NFS client can choose any of the
       modes in the list.

       The sec=mode option on the share_nfs(1M) command line establishes the security mode of NFS
       servers. If the NFS connection uses the NFS Version 3 protocol, the NFS clients must query
       the  server  for the appropriate mode to use. If the NFS connection uses the NFS Version 2
       protocol, then the NFS client uses the default security mode, which is currently sys.  NFS
       clients may force the use of a specific security mode by specifying the sec=mode option on
       the command line. However, if the file system on the server is not shared with that  secu-
       rity mode, the client may be denied access.

       If the NFS client wants to authenticate the NFS server using a particular (stronger) secu-
       rity mode, the client wants to specify the security mode to be used, even if  the  connec-
       tion uses the NFS Version 3 protocol. This guarantees that an attacker masquerading as the
       server does not compromise the client.

       The NFS security modes are described below. Of these, the krb5, krb5i, krb5p modes use the
       Kerberos  V5  protocol  for  authenticating  and protecting the shared filesystems. Before
       these can be used, the system must be configured to be part of a Kerberos realm. See  ker-

       sys	Use  AUTH_SYS authentication. The user's UNIX user-id and group-ids are passed in
		the clear on the network, unauthenticated by the NFS server. This is the simplest
		security method and requires no additional administration. It is the default used
		by Solaris NFS Version 2 clients and Solaris NFS servers.

       dh	Use a Diffie-Hellman public key system (AUTH_DES, which is referred to as AUTH_DH
		in the forthcoming Internet RFC).

       krb5	Use  Kerberos  V5  protocol  to  authenticate users before granting access to the
		shared filesystem.

       krb5i	Use Kerberos V5 authentication with integrity checking (checksums) to verify that
		the data has not been tampered with.

       krb5p	User  Kerberos	V5  authentication,  integrity	checksums, and privacy protection
		(encryption) on the shared filesystem. This provides the most  secure  filesystem
		sharing,  as  all traffic is encrypted. It should be noted that performance might
		suffer on some systems when using krb5p, depending on the computational intensity
		of the encryption algorithm and the amount of data being transferred.

       none	Use null authentication (AUTH_NONE). NFS clients using AUTH_NONE have no identity
		and are mapped to the anonymous user nobody by NFS  servers.  A  client  using	a
		security  mode other than the one with which a Solaris NFS server shares the file
		system has its security mode mapped to AUTH_NONE. In this case, if the file  sys-
		tem  is  shared  with sec=none, users from the client are mapped to the anonymous
		user. The NFS security mode none  is  supported  by  share_nfs(1M),  but  not  by
		mount_nfs(1M) or automount(1M).

       /etc/nfssec.conf    NFS security service configuration file

       See attributes(5) for descriptions of the following attributes:

       |Availability		      SUNWnfscr 		   |

       automount(1M),	 kclient(1M),	 mount_nfs(1M),    share_nfs(1M),    rpc_clnt_auth(3NSL),
       secure_rpc(3NSL), nfssec.conf(4), attributes(5), kerberos(5)

       /etc/nfssec.conf lists the NFS security services.  Do  not  edit  this  file.  It  is  not
       intended to be user-configurable. See kclient(1M).

SunOS 5.11				   16 Mar 2009					nfssec(5)

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