Red Hat Bugzilla – Bug 531849
gssapi patch from 4.3p2 (patch49) causes gssapi failures when host is accessed via pipe proxy
Last modified: 2010-11-04 07:36:07 EDT
Created attachment 366662 [details]
Patch to revert to old gssapi hostname behaviour if get_canonical_hostname fails
Description of problem:
The patch openssh-4.3p2-gssapi-canohost.patch , named patch49 in the spec file, fixes an instance where the DNS name changes such as a DNS round robin. The problem is that if for any reason get_canonical_hostname returns "UNKNOWN", such as the case where the connection is not a socket connection but a pipe (ProxyConnect nc ... ) then gssapi will always fail.
This patch replaces the older patch so that it reverts to the old pre-patch behavior if get_canonical_hostname fails. The older behavior uses the hostname provided by the user.
Steven (email@example.com) mentioned also that using the string "UNKNOWN" as a failure might cause problems with the corner case of a host named "unknown". Possibly a better failure return for get_canonical_hostname would help there (a null string?)
Version-Release number of selected component (if applicable):
Attempt to use GSSAPI auth through a pipe proxy
Steps to Reproduce:
1. ssh -D 9999 my.bastion.host -N -f
2. ssh -oProxyCommand="/usr/bin/nc -X 5 -x localhost:9999 %h %p" my.host.with.gssapi
GSSAPI tries to canonicalize "UNKNOWN" via DNS queries and fails.
GSSAPI auth works correctly and allows access.
Patch applied in f13 and f12 also.
This bug appears to have been reported against 'rawhide' during the Fedora 12 development cycle.
Changing version to '12'.
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I believe this patch was accepted awhile ago, I see it in the current F14 openssh RPM.