Technical data

• Identity of the requester as a UID/GID pair
• Requested NFS operation and any data associated with the operation
The server searches its proxy database for an entry that corresponds to the
requester’s UID/GID pair. If the UID maps to an OpenVMS account, the server
grants access to the file system according to the privileges set for that account. In
the following example, the proxy entry maps a client user with UID=15/GID=15, to
the OpenVMS account named ACCOUNT2. Any files owned by user ACCOUNT2
are deemed also to be owned by user UID=15 and GID=15.
OpenVMS
User_name
Type User_ID
Group_ID
Host_name
ACCOUNT2
OND
15 15 *
After the OpenVMS identity is resolved, the NFS server uses this acquired identity
for all data access, as described in the Compaq TCP/IP Services for OpenVMS
Management guide.
7.3.5 Granting Access to PC-NFS Clients
TCP/IP Services provides authentication services to PC-NFS clients by means of
PC-NFS. As with any NFS client, users must have a valid account on the NFS
server host, and user identities must be registered in the proxy database.
Because PC operating systems do not identify users with UID/GID pairs, these
pairs must be assigned to users. PC-NFS assigns UID/GID pairs based on
information you supply in the proxy database. The following describes this
assignment sequence:
1. The PC client sends a request for its UID/GID pair. This request includes
the PC’s host name with an encoded representation of the user name and
password.
2. PC-NFS responds by searching the proxy database and SYSUAF for a
matching entry and by checking the password. If a matching entry is located,
PC-NFS returns the UID/GID pair to the PC client. The PC stores the
UID/GID pair for later NFS requests.
3. If PC-NFS does not find an entry for the PC client in the proxy database, it
maps the PC client to the default user TCPIP$NOBODY account. In this
case, the client may abort the mount attempt. If the client does complete
the mount, restricted access may be granted based on privileges established
for the default user account.
For more discussion about the default user, refer to the Compaq TCP/IP Services
for OpenVMS Management guide.
7.4 X Display Manager (XDM)
The X Window System, developed at the Massachusetts Institute of Technology, is
a network-based graphics window system based on the client/server application
model. The X protocol, through which the client and server communicate, runs on
UNIX domain sockets, TCP/IP, or DECnet. This means that an X display on one
system can display information output from an application running on another
system in the network.
An X display is a graphic output device that is known by the X Display Manager
(XDM). These devices can include:
•AnXterminal
Connectivity Services 7–5