Account Options

  1. Sign in
The old Google Groups will be going away soon, but your browser is incompatible with the new version.
Google Groups Home
« Groups Home
perl.ldap
+ new post
About this group
Subscribe to this group
This is a Usenet group - learn more
Message from discussion Authen::SASL 2.13 infinite loop bug (resend?)
The group you are posting to is a Usenet group. Messages posted to this group will make your email address visible to anyone on the Internet.
Your reply message has not been sent.
Your post was successful
 
From:
To:
Cc:
Followup To:
Add Cc | Add Followup-to | Edit Subject
Subject:
Validation:
For verification purposes please type the characters you see in the picture below or the numbers you hear by clicking the accessibility icon. Listen and type the numbers you hear
 
Graham Barr  
View profile  
 More options Feb 11 2010, 10:43 am
Newsgroups: perl.ldap
From: gb...@pobox.com (Graham Barr)
Date: Thu, 11 Feb 2010 09:43:41 -0600
Local: Thurs, Feb 11 2010 10:43 am
Subject: Re: Authen::SASL 2.13 infinite loop bug (resend?)
Print | View thread | Show original | Report this message | Find messages by this author
On Feb 11, 2010, at 9:10 AM, Forrest Cahoon wrote:

> I sent this to the list yesterday, but I never saw it show up in the
> archives. Now I've subscribed and am resending to see if that works.
> Sorry if this is a duplicate.

I did not see it yesterday.

> I'm porting some code from our old system to a new one, and I
> encountered this bug with Authen::SASL 2.13 which was resolved by
> downgrading to 2.12.

I suspect this was caused by this change

http://github.com/gbarr/perl-authen-sasl/commit/c636a0603732b031d9274...

I do not know much about EXTERNAL, but what happens if we revert client_step to what it was ?

Can you also turn on debug with $ldap->debug(15); so we can see what responses the server
is returning as this should not loop.

Graham.

> I'm afraid I don't know that much about SASL (or LDAP), but I did cut
> this down to as close to a "hello world" version as I could.

> Here's my code (with some names changed to protect the innocent):

> use strict;
> use Net::LDAP;
> use Authen::SASL;

> my $ldap = Net::LDAP->new(
>   'ldaps://my.ldap.server',
>   version => 3,
>   verify => 'require',
>   clientcert => '/path/to/my/client/cert',
>   clientkey => '/path/to/my/client/key',
>   cafile => '/path/to/my/cafile',
>   timeout => 10,
>   );

> die "no Net::LDAP: $!\n" unless $ldap;

> my $sasl = Authen::SASL->new(
>   mechanism => 'EXTERNAL',
>   callback  => { user => '' },
>   debug => 13,
>   );

> alarm(10); # for Devel::SimpleTrace

> my $result = $ldap->bind( "sn=msiScripts,dc=DTC", sasl => $sasl );

> if ( $result->code ) {
>   die "bind with sasl failed: " . $result->error;
> }

> print "success!\n";

> __END__

> Using Authen::SASL 2.13,  running this code with -wMDevel::SimpleTrace
> gives the following  stack trace when the alarm times out:

> Deep recursion on subroutine "Net::LDAP::_sendmesg"
>       at Net::LDAP::_sendmesg(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP/Bind.pm
> line 64, <DATA>:275)
>       at Net::LDAP::Bind::decode(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP/Bind .pm:64)
>       at Net::LDAP::process(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:865)
>       at Net::LDAP::sync(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:760)
>       at Net::LDAP::_sendmesg(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:813)
>       at Net::LDAP::Bind::decode(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP/Bind .pm:64)
>       at Net::LDAP::process(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:865)
>       at Net::LDAP::sync(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:760)
>       at Net::LDAP::_sendmesg(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:813)

> [ ... many, many, many, many, many iterations of the same loop omitted ... ]

>       at Net::LDAP::Bind::decode(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP/Bind .pm:64)
>       at Net::LDAP::process(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:865)
>       at Net::LDAP::sync(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:760)
>       at Net::LDAP::_sendmesg(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:813)
>       at Net::LDAP::bind(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:422)
>       at main::(ldaptest.pl:25)

> When I downgraded to Authen::SASL 2.12, I got a "success!" message
> (yay!) but I also got an interesting stack trace from
> Devel::Simpletrace:

> Use of uninitialized value in numeric gt (>)
>       at Authen::SASL::Perl::securesocket(/usr/local/lib/perl5/site_perl/5.10.1/Auth en/SASL/Perl.pm
> line 130, <DATA>:275)
>       at Net::LDAP::Bind::decode(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP/Bind .pm:39)
>       at Net::LDAP::process(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:865)
>       at Net::LDAP::sync(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:760)
>       at Net::LDAP::_sendmesg(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:813)
>       at Net::LDAP::Bind::decode(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP/Bind .pm:64)
>       at Net::LDAP::process(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:865)
>       at Net::LDAP::sync(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:760)
>       at Net::LDAP::_sendmesg(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:813)
>       at Net::LDAP::bind(/usr/local/lib/perl5/site_perl/5.10.1/Net/LDAP.pm:422)
>       at main::(ldaptest.pl:25)
> success!

> Perhaps the changes in 2.13 included a bad fix for the nonfatal error
> shown for 2.12 here?

> Forrest Cahoon


 
You must Sign in before you can post messages.
To post a message you must first join this group.
Please update your nickname on the subscription settings page before posting.
You do not have the permission required to post.
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
©2013 Google