Administering Authentication With Secure RPC (Tasks)

By requiring authentication for use of mounted NFS file systems, you increase the security of your network.

Administering Secure RPC (Task Map)

The following task map points to procedures that configure Secure RPC for NIS, and NFS.

How to Restart the Secure RPC Keyserver

Before You Begin

You must assume the root role. For more information, see How to Use Your Assigned Administrative Rights.

1. Verify that the keyserv daemon is running.

   # svcs \*keyserv\*
   STATE    STIME   FMRI
   disabled Dec_14  svc:/network/rpc/keyserv

2. Enable the keyserver service if the service is not online.

   # svcadm enable network/rpc/keyserv

How to Set Up a Diffie-Hellman Key for an NIS Host

This procedure should be done on every host in the NIS domain.

Before You Begin

You must assume the root role. For more information, see How to Use Your Assigned Administrative Rights.

1. If the default naming service is not NIS, add the publickey map to the naming service.
   1. Verify that the value of config/default for the naming service is not nis.

      # svccfg -s name-service/switch listprop config
      config                       application
      config/value_authorization   astring       solaris.smf.value.name-service.switch
      config/default               astring       files
      config/host                  astring       "files nis dns"
      config/printer               astring       "user files nis"

      If the value of config/default is nis, you can stop here.

   2. Set the naming service for publickey to nis.

      # svccfg
      # svccfg -s name-service/switch setprop config/publickey = astring: "nis"
      # svccfg -s name-service/switch:default refresh

   3. Confirm the publickey value.

      # svccfg
      # svccfg -s name-service/switch listprop
      config                       application
      config/value_authorization   astring       solaris.smf.value.name-service.switch
      config/default               astring       files
      config/host                  astring       "files nis dns"
      config/printer               astring       "user files nis"
      config/publickey             astring       nis

      On this system, the value of publickey is listed because it differs from the default, files.

2. Create a new key pair by using the newkey command.

   # newkey -h hostname

   where hostname is the name of the client.

Example 18-1 Setting Up a New Key for root on an NIS Client

In the following example, earth is set up as a secure NIS client. The administrator is assigned the Name Service Security rights profile.

# newkey -h earth
Adding new key for unix.earth@example.com
New Password:   <Type password>
Retype password:<Retype password>
Please wait for the database to get updated...
Your new key has been successfully stored away.
#

How to Set Up a Diffie-Hellman Key for an NIS User

This procedure should be done for every user in the NIS domain.

Before You Begin

Only system administrators, when logged in to the NIS master server, can generate a new key for a user. The administrators must be assigned the Name Service Security rights profile.

1. Become an administrator with the required security attributes.

   For more information, see How to Use Your Assigned Administrative Rights.

2. Create a new key for a user.

   # newkey -u username

   where username is the name of the user. The system prompts for a password. You can type a generic password. The private key is stored in an encrypted form by using the generic password.

3. Tell the user to log in and type the chkey -p command.

   This command allows users to re-encrypt their private keys with a password known only to the user.

   ---

   Note - The chkey command can be used to create a new key pair for a user.

   ---

Example 18-2 Setting Up and Encrypting a New User Key in NIS

In this example, superuser sets up the key.

# newkey -u jdoe
Adding new key for unix.12345@example.com
New Password:   <Type password>
Retype password:<Retype password>
Please wait for the database to get updated...
Your new key has been successfully stored away.
#

Then the user jdoe re-encrypts the key with a private password.

% chkey -p
Updating nis publickey database.
Reencrypting key for unix.12345@example.com
Please enter the Secure-RPC password for jdoe:<Type password>
Please enter the login password for jdoe:     <Type password>
Sending key change request to centralexample...

How to Share NFS Files With Diffie-Hellman Authentication

This procedure protects shared file systems on an NFS server by requiring authentication for access.

Before You Begin

Diffie-Hellman public key authentication must be enabled on the network. To enable authentication on the network, complete How to Set Up a Diffie-Hellman Key for an NIS Host.

You must become an administrator who is assigned the System Management rights profile to perform this task. For more information, see How to Use Your Assigned Administrative Rights.

1. On the NFS server, share a file system with Diffie-Hellman authentication.

   # share -F nfs -o sec=dh /filesystem

   where filesystem is the file system that is being shared.

   The -o sec=dh option means that AUTH_DH authentication is now required to access the file system.

2. On an NFS client, mount a file system with Diffie-Hellman authentication.

   # mount -F nfs -o sec=dh server:filesystem mount-point

   server

   Is the name of the system that is sharing filesystem

   filesystem

   Is the name of the file system that is being shared, such as opt

   mount-point

   Is the name of the mount point, such as /opt

   The -o sec=dh option mounts the file system with AUTH_DH authentication.