Bug 727684 - oidentd does not support IPv6 connections
Summary: oidentd does not support IPv6 connections
Alias: None
Product: Fedora
Classification: Fedora
Component: oidentd
Version: 15
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Matthias Saou
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2011-08-02 20:58 UTC by Ian Pilcher
Modified: 2012-08-07 17:01 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-08-07 17:01:46 UTC

Attachments (Terms of Use)

Description Ian Pilcher 2011-08-02 20:58:20 UTC
Description of problem:

oidentd returns a NO-USER error when queried about an existing IPv6
connection, including "IPv4-mapped" addresses.

If I make a IPv4 connection to PostgreSQL with "psql -h", oidentd

netstat --inet --inet6 -n | grep 5432
tcp        0      0                 ESTABLISHED 
tcp        0      0                 ESTABLISHED
[pilcher@ian ~]$ telnet localhost auth
Connected to localhost.
Escape character is '^]'.
37916, 5432
Connection closed by foreign host.

If I make a "mapped" connection with "psql -h ::ffff:", oidentd

[pilcher@ian ~]$ netstat --inet --inet6 -n | grep 5432
tcp        0      0                 ESTABLISHED 
tcp        0      0 ::ffff:      ::ffff:       ESTABLISHED
[pilcher@ian ~]$ telnet localhost auth
Connected to localhost.
Escape character is '^]'.
55509, 5432
Connection closed by foreign host.

Similarly, a "pure" IPv6 connection ("psql -h ::1") also causes oidentd to

[pilcher@ian ~]$ netstat --inet --inet6 -n | grep 5432
tcp        0      0 ::1:43607                   ::1:5432                    ESTABLISHED 
tcp        0      0 ::1:5432                    ::1:43607                   ESTABLISHED
[pilcher@ian ~]$ telnet localhost auth
Connected to localhost.
Escape character is '^]'.
43607, 5432
Connection closed by foreign host.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Query oidentd about any IPv6 connection.
Actual results:
oidentd will return a NO-USER error.

Expected results:
oidentd should return the correct result (assuming it is configured to do so).

Additional info:
This is a real problem for many IPv6-capable applications (including all Java
applications), since they will use a "mapped" address whenever told to connect
to an IPv4 address.

Comment 1 Ian Pilcher 2011-08-02 23:34:08 UTC
With further experimentation and reflection ... things are not bad.

Once I added "-a ::" to OIDENTD_OPTIONS in /etc/sysconfig/oidentd, everything
works as expected, including "mapped IPv4" addresses.

So it looks like that option should be added to /etc/sysconfig/oidentd (or
the behavior of the daemon should be changed to make that the default).

(The reflection part was me realizing that and ::1 are *not* the
same address.  Duh!)

Comment 2 Matthias Saou 2011-08-03 08:43:25 UTC
Thanks for the details. Before adding "-a ::" the first thing would be to test how that would affect existing IPv4 only systems, as it's quite likely startup would fail with a bind error.

Comment 3 Fedora End Of Life 2012-08-07 17:01:48 UTC
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