Bug 139803 - glibc limits usernames to 32 characters
glibc limits usernames to 32 characters
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: vsftpd (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Radek Vokal
Mike McLean
Depends On:
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Reported: 2004-11-18 00:42 EST by Karl Latiss
Modified: 2007-11-30 17:07 EST (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2005-06-27 21:16:23 EDT
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Description Karl Latiss 2004-11-18 00:42:16 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.4.3)
Gecko/20040924 MultiZilla/

Description of problem:
usernames are limited to 32 characters. Usernames longer than 32
characters do not successfully authenticate.

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

How reproducible:

Steps to Reproduce:
1.Have username longer than 32 characters (ours is in LDAP)
2.Try to use that username to authenticate an ftp session

Actual Results:  login fails with a "Login failed" error message.

Expected Results:  login is successful

Additional info:

The long username is supplied via LDAP - vsftpd is configured to use
PAM. The length of the username is due to it's email format, ie the
username is an email address.
Comment 1 Karl Latiss 2004-11-23 02:06:11 EST
After further research I've changed the component (and title) to glibc
as I believe the problem lies at the system level.

I believe that this limit needs to be increased so as to provide a
consistant "single sign on" facility where the single username is
often an email address. 
Comment 2 Radek Vokal 2004-12-08 03:52:20 EST
glibc supports usernames longer than 32 characters (may I have your
glibc version to confirm this) It seems like problem either in vsftpd
or somewhere in between. Anyway I didn't manage to configure vsftpd to
work with LDAP. Can you give me some configuration hints so I can
reproduce this bug?
Comment 3 Radek Vokal 2004-12-08 04:58:16 EST
in addition, I've figure out that it vsftpd which trims usernames to
32chars. Still looking for some test case with LDAP.
Comment 5 Radek Vokal 2004-12-09 09:03:20 EST
Fixed in vsftpd-1.2.1-3E.2

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