Demo Discussion
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ID Date Icon Author Author Emaildown Category OS ELOG Version Subject
  Draft   Fri Jan 20 14:08:25 2023 Question Tamas Galhe iQuestionLinux3.1.3Re: Too many redirects when running behind load balancer?

The issue is still present and now it's quite urgent to move this last service into the Swarm. Does anyone maybe have an idea what's wrong? To sum up: if there is a non-empty password file, the login page chokes in an infinite loop of redirects. I am using the same HAProxy load balancer configuration as for all the other services (running Apache, NGINX, GitLab, XWiki, etc.):

backend be_elog.km3net.de
    mode http

    option forwardfor except 127.0.0.1
    http-request add-header X-Forwarded-Proto https if { ssl_fc }

    server-template km3net-elog- 1 km3net-elog_elog:8080 check resolvers docker init-addr libc,none

Tamas Gal wrote:

Yes, I used the empty `passwd` file from example. When I then click on one of the logbooks, I get to the page where I can register a user (see attached screenshot). After clickin on "Save" for the user registration, I again get the redirect error. Once there is a registered user (i.e. a non-empty password file) the redirect issue is persistent. Any idea where the problem might be? I just emptied the password file again, so you can have a one-shot, if you like.

Btw. I have SSL termination in the load balancer, so ELOG does not need to do any SSL related things (the swarm is in a locally isolated network, so all internal communication between the load balancer and the swarm machines are safe). Maybe that's the issue? On the other hand, the main page loads fine and uses SSL termination too, so I don't know, maybe there is logic behind the authentication which collides with the SSL termination.

Stefan Ritt wrote:

Yes I see the redirects. You say with the example logbook it works, right? Is it the password protection which triggers the problem or anything else? Does it work if you take out the password protection? The key is to identify which setting in your config file triggers the problem, so you can bracket the problem down between the example logbook and your logbook definition.

 

 

  50   Thu Jul 4 16:52:59 2002 Warning Heiko Scheith.scheit@mpi-hd.mpg.de   elog submit problem
If a message is submitted via the elog command then the reply string '> ' is only inserted in the first line if a reply is made.
This message was submitted with the following commandline:
elog -v -h midas.psi.ch -p 80 -s elogdemo -l Forum -a "Icon=icon4.gif" -a "Author=Heiko Scheit"  -a "Author Email=h.scheit@mpi-hd.mpg.de" -a "Subject=elog submit problem" "...Message-text..."

Please press the reply button to see the problem.
  51   Thu Jul 4 17:05:03 2002 Warning Heiko Scheith.scheit@mpi-hd.mpg.deBug report  reverse sort and threaded mode does not display first entry
When the option 'Reverse sort = 1' is used then the first entry
is not displayed (ID=1) when threaded mode is requested.

Probably you can see the problem using this link and switching 
on reverse sort.  

http://midas.psi.ch/elogdemo/Linux/last20?mode=threaded
  52   Thu Jul 4 17:09:09 2002 Warning Heiko Scheith.scheit@mpi-hd.mpg.deRequest  exit status of elog
The exit status of elog is always 1.  It should be zero for
a successful submission.
  57   Mon Jul 8 19:42:13 2002 Warning H. Scheith.scheit@mpi-hd.mpg.deBug report  elog submit without user and password
With elog it is possible to submit messages to a password protected
logbook without specifying the -u option.  I.e. NO PASSWORD is
necessary to submit a message.  I assume it is related to the problem
of expiring password-cookies while entering the message using a web
browser.
  64   Tue Jul 9 15:28:33 2002 Reply H. Scheith.scheit@mpi-hd.mpg.deComment  Re: elog submit without user and password
> > With elog it is possible to submit messages to a password protected
> > logbook without specifying the -u option.  I.e. NO PASSWORD is
> > necessary to submit a message.  I assume it is related to the problem
> > of expiring password-cookies while entering the message using a web
> > browser.
> 
> Indeed this problem is related to the expiring password cookies. As a 
> reminder: For the submission of a new entry, the password is checked when
one 
> presses the "New" button, but NOT for the "submit". This is because a 
> password can expire between the "New" and the "Submit", so a entered message 
> could not be sent. The question is now what to do with the standalone
"elog".
> 
> Right now, elog does a normal submission where the password is not checked, 
> which is maybe not what one wants. But what to do? If elog sends a special 
> flag "please do check password on submit", someone could analyze the source 
> code, remove the flag from elog and then still submit messages without a 
> password. If I put an additional flag to the web browser submission "please 
> do not check the password since the cookie might have been expired", someone 
> can add this flag into elog and still bypass the password checking.

I guess it cannot and doesn't have to be 100% save.  Maybe if the web
interface is used for a new message a long random number (let's call
it newID) can be included, which elog remembers for some time (say 1
day).  Now elogd accepts a new message only if 

  1) the cookies is there and valid or
  2) if the cookies are NOT THERE, but the newID matches one of the
       stored ones.     

The new message is rejected if the cookies are there, but are wrong.

> Anothe thing which bothers me is if you specify the password explicitly on 
> the command line of elog, it's visible in some scripts etc, which yould be a 
> security issue as well.

Maybe the encoded password should be specified.  I use wget to
retrieve some entries automatically over a cron job and with wget
you specify a cookie-file with --cookie-file (or something like
this).  The content of this file corresponds to the content of the
netscape cookie file.

> 
> Any ideas?

Can one delete or edit messages with elog?  If yes then this should not be
possible.
  70   Fri Jul 12 10:18:21 2002 Warning H. Scheith.scheit@mpi-hd.mpg.deBug report  last x link TEXT
The last x link TEXT now shows up like this

   'Last 20 entries?mode=threaded'

I can not reproduce this with the elogdemo logbook, however.
  461   Thu Jan 29 00:24:44 2004 Warning Joseph Giaimegiaime@phys.lsu.eduBug reportMac OSX2.3.9Strange timezone in email sent with Postfix
Hi all,
I'm having trouble getting a sensible timezone to be attached to e-mail that gets sent out when messages are posted. I'm using Postfix, not sendmail (Mac OS X Server uses this beginning with version 10.3). In this set-up, the 'sendmail' program is a front-end for Postfix, not the real thing. I suspect that there are subtle differences that cause this problem.
Instead of something like "Date: Wed, 28 Jan 2004 14:46:16 -0600", the "-0600" is replaced by a large number that doesn't correspond with anything I can figure out. This is the sort of thing that does no real harm, but the notebook users keep complaining
Any thoughts or suggestions would be appreciated. -Joe
Here is what gets mailed when a messages is posted:
Return-Path: 
Received: from ligo.phys.lsu.edu ([unix socket])
	by ligo.phys.lsu.edu (Cyrus v2.1.13) with LMTP; Wed, 28 Jan 2004 16:27:03 -0600
X-Sieve: CMU Sieve 2.2
Received: from ligo.phys.lsu.edu (ligo.phys.lsu.edu [130.39.181.231])
	by ligo.phys.lsu.edu (Postfix) with SMTP
	id 5E12A788D1; Wed, 28 Jan 2004 16:27:03 -0600 (CST)
To: ELOG@ligo.phys.lsu.edu, user@ligo.phys.lsu.edu
From: elog@ligo.phys.lsu.edu
Subject: New playground elog entry
X-Mailer: Elog, Version 2.3.9
X-Elog-URL: http://ligo.phys.lsu.edu:8080/playground/13
X-Elog-submit-type: web|elog
Date: Wed, 28 Jan 2004 22:27:03 +52182819
Content-Type: TEXT/PLAIN; charset=US-ASCII
Message-Id: <20040128222703.5E12A788D1@ligo.phys.lsu.edu>

A new entry has been submitted on ligo.phys.lsu.edu

Logbook             : playground
Author              : Joseph Giaime
Type                : Other
Category            : Other
Subject             : yet another test

Logbook URL         : http://ligo.phys.lsu.edu:8080/playground/13
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