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Created attachment 1039200[details]
initial version of patch
Description of problem:
If a netgroup entry specifies an IP address, and that IP address can be resolved to a name, the current match code only tests whether the canonical name and any aliases are in the netgroup, and does not test whether the IP address is in the netgroup.
If the IP address does not resolve to a name, the IP does get checked for membership in the netgroup, as expected.
As far as I can tell, this affects all versions of nfs-utils, including upstream.
Version-Release number of selected component (if applicable):
nfs-utils-1.2.3-54.el6.x86_64 (though appears to affect all versions)
How reproducible:
reproducer below
Steps to Reproduce:
/etc/netgroup:
test_netgroup (127.0.0.1,-,-)
/etc/exports:
/data2 @test_netgroup(rw,sync)
# mkdir /data2
# mkdir -p /mnt/test
# exportfs -a
# mount localhost:/data2 /mnt/test
Actual results:
mount.nfs: access denied by server while mounting localhost:/data2
(this will fail, assuming that there's a localhost entry in /etc/hosts)
Expected results:
mount succeeds
Additional info:
I took a first crack at a patch for support/export/client.c. It works, but probably needs fixing.
The two needed upstream commits:
commit 4b5bd85481a45957122357feebfcd514550fc219
Author: Frank Sorenson <sorenson>
Date: Wed Dec 16 10:12:38 2015 -0500
mountd: fix netgroup lookup for short hostnames
commit 9a92ef6f194926904b1289e0ce1daecb42bd5e8b
Author: Frank Sorenson <sorenson>
Date: Mon Nov 2 08:31:29 2015 -0500
mountd: fix netgroup lookup for resolvable IP addresses
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2016-0868.html
Created attachment 1039200 [details] initial version of patch Description of problem: If a netgroup entry specifies an IP address, and that IP address can be resolved to a name, the current match code only tests whether the canonical name and any aliases are in the netgroup, and does not test whether the IP address is in the netgroup. If the IP address does not resolve to a name, the IP does get checked for membership in the netgroup, as expected. As far as I can tell, this affects all versions of nfs-utils, including upstream. Version-Release number of selected component (if applicable): nfs-utils-1.2.3-54.el6.x86_64 (though appears to affect all versions) How reproducible: reproducer below Steps to Reproduce: /etc/netgroup: test_netgroup (127.0.0.1,-,-) /etc/exports: /data2 @test_netgroup(rw,sync) # mkdir /data2 # mkdir -p /mnt/test # exportfs -a # mount localhost:/data2 /mnt/test Actual results: mount.nfs: access denied by server while mounting localhost:/data2 (this will fail, assuming that there's a localhost entry in /etc/hosts) Expected results: mount succeeds Additional info: I took a first crack at a patch for support/export/client.c. It works, but probably needs fixing.