I know this is an old discussion - but your problem is, imho, self-inflicted.
Code:
michael@x071:[/home/michael]nfso -h nfs_use_reserved_ports
Purpose:
Specifies using nonreserved IP port number.
Values:
Default: 0
Range: 0 - 1
Type: Dynamic
Unit: On/Off
Tuning:
Value of 0 will use nonreserved IP port number when the NFS client communicates with the NFS server.
In the early 1980's there was this idea that port numbers less than 1024 could be "trusted" because only the super-user (aka root) could access them. This trust has been misplaced since the late 1980's as too many processes can access this so-called trusted ports. Why trust NFS (on port 2049)? It is well above 1024. Why it that number above 2049 trust-worthy and not other numbers.
In short, "trusted ports" exist in that it is still specified that a kernel privilege is needed to "open" aka request a connection from/to any other port.
If someone, even from your local security, says they MUST be 1023 and smaller - of course you can comply - BUT they are causing another security concept to become breached - availability. Not enough ports means no connectivity.
In short, port numbers - there is no added trust because a specific port number is being used. There might be a technical reason (e.g., firewall rules) to stay in a particular range - but the port number itself neither adds nor subtracts from the application security.
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Discussion started by: Mcipamo
5 Replies
LEARN ABOUT HPUX
nfs_portmon
nfs_portmon(5) File Formats Manual nfs_portmon(5)NAME
nfs_portmon - enable/disable the NFS server's source port verification check
VALUES
Failsafe
Default
Allowed values
DESCRIPTION
controls some security checking that the NFS server can do in an attempt to enforce integrity on the part of its clients. The NFS server
can check to see whether the source port from which a request was sent is a reserved port; a reserved port is a port whose port number is
less then 1024. For BSD-based systems, these ports are reserved for processes being run by privileged users. This checking helps prevent
users from writing their own RPC-based applications which defeat the access checking that the NFS server uses.
Who Is Expected to Change This Tunable?
The distributed file system administrator should examine the value of this parameter if he or she wishes to prevent malicious users from
gaining access to files by using an NFS server they would not ordinarily be able to access.
Restrictions on Changing
The tunable is dynamic; any change will take effect immediately on the running system.
The reserved port notion is not universally supported. Therefore, interoperability problems might result if this checking is enabled.
What Are the Side Effects of Enabling This Check?
Some NFS clients may not be able to connect to the NFS server.
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of
HP-UX.
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun-
able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was
factory installed on your system, see at
AUTHOR
was developed by Sun Microsystems, Inc.
SEE ALSO kctune(1M), sam(1M), gettune(2), settune(2).
Tunable Kernel Parameters nfs_portmon(5)
08-15-2018
