cgi scripts fail to run from userdir with "End of script output before headers" errors
Lonni J Friedman
netllama at gmail.com
Fri Oct 10 09:28:21 PDT 2014
On Thu, Oct 9, 2014 at 6:58 PM, James McDonald
<james at jamesmcdonald.id.au> wrote:
> Not something silly like having 700 set on /home/user or below ?
Nope:
[netllama at netllama home]$ ls -ld /home/
drwxr-xr-x. 4 root root 34 Jan 31 2014 /home/
[netllama at netllama home]$ ls -ld /home/netllama/
drwx--x--x. 45 netllama netllama 4096 Oct 10 08:52 /home/netllama/
[netllama at netllama home]$ ls -ld /home/netllama/public_html/
drwxrwxr-x 4 netllama netllama 48 Oct 6 09:33 /home/netllama/public_html/
[netllama at netllama home]$ ls -ld /home/netllama/public_html/cgi-bin/
drwxrwxr-x 2 netllama netllama 30 Oct 8 10:31
/home/netllama/public_html/cgi-bin/
>
> Still using suexec what does suexec -V say?
/usr/sbin/suexec -V
-D AP_DOC_ROOT="/var/www"
-D AP_GID_MIN=100
-D AP_HTTPD_USER="apache"
-D AP_LOG_SYSLOG
-D AP_SAFE_PATH="/usr/local/bin:/usr/bin:/bin"
-D AP_UID_MIN=500
-D AP_USERDIR_SUFFIX="public_html"
>
>
>
>
>
>
>
> On 10 October 2014 12:40, David A. Bandel <david.bandel at gmail.com> wrote:
>>
>> Lonnie,
>>
>> Well, I believe you still need a "required" line in the
>> /home/*/public_html/ directory portion, but I'm running out of ideas.
>>
>> 1. Are you using apparmor? If so, kill it.
>>
>> Try this for your userdir.conf:
>> <IfModule mod_userdir.c>
>> UserDir public_html
>> UserDir disabled root
>> AddHandler cgi-script .cgi .pl
>> <Directory /home/*/public_html>
>> AllowOverride FileInfo AuthConfig Limit Indexes
>> Options Includes MultiViews Indexes SymLinksIfOwnerMatch
>> Require all granted
>> </Directory>
>> <Directory /home/*/public_html/cgi-bin>
>> AllowOverride FileInfo AuthConfig Limit Indexes
>> Options ExecCGI Includes MultiViews SymLinksIfOwnerMatch
>> Require all granted
>> </IfModule>
>>
>> If the above doesn't work, try accessing from your browser via your
>> hostname vice localhost (if no DNS for the hostname, just add to
>> /etc/hosts).
>>
>> Starting to run low on ideas ...
>>
>> David-
>>
>>
>> On Thu, Oct 9, 2014 at 10:52 AM, Lonni J Friedman <netllama at gmail.com>
>> wrote:
>>>
>>> I made the changes that you recommended, restarted apache, but it
>>> didn't help. Still getting the same cryptic error. I've attached
>>> userdir.conf with the changes, in case I somehow screwed it up.
>>>
>>> thanks
>>>
>>> On Wed, Oct 8, 2014 at 7:21 PM, David A. Bandel <david.bandel at gmail.com>
>>> wrote:
>>> > Lonnie,
>>> >
>>> > I see two glaring errors:
>>> > 1. no ScriptAlias directive in the userdir.conf file (see main file
>>> > for
>>> > use)
>>> > 2. The file set up the userdir area read-only. In the cgi-bin stanza,
>>> > you
>>> > need:
>>> > Require all granted (in 2.4 the two lines Order Allow Deny and Allow
>>> > from
>>> > all became the one Require line -- it's also more flexible)
>>> > The stanza for the directory above it has Require method GET POST
>>> > OPTIONS
>>> > which locks this area and subdirectories down
>>> >
>>> > You might want to remove Indexes from your cgi-bin area. Do you really
>>> > want
>>> > folks to be able to get a directory listing of the cgi-bin directory?
>>> > (no,
>>> > you really don't)
>>> >
>>> > With those changes and a reload, it should work.
>>> >
>>> > Before you go production, make sure you remove the cgitb (cgi trace
>>> > back)
>>> > module. No sense giving the bad guys more ammo.
>>> >
>>> > David-
>>> >
>>> > On Wed, Oct 8, 2014 at 2:11 PM, Lonni J Friedman <netllama at gmail.com>
>>> > wrote:
>>> >>
>>> >> That's correct, the script works just fine when in /var/www/cgi-bin.
>>> >> mod_cgi is explicitly loaded.
>>> >>
>>> >> I've attached my config files. userdir.conf & 01-cgi.conf are
>>> >> included from httpd.conf.
>>> >>
>>> >> On Wed, Oct 8, 2014 at 12:06 PM, David A. Bandel
>>> >> <david.bandel at gmail.com>
>>> >> wrote:
>>> >> > Lonnie,
>>> >> >
>>> >> > OK, there must be a global configuration that's preventing this
>>> >> > script
>>> >> > from
>>> >> > running. Can you post your entire config file? If you don't want
>>> >> > to do
>>> >> > that, I can provide an alternate means to pass it to me. Also, you
>>> >> > said
>>> >> > these run if you put them in your global cgi-bin directory, just not
>>> >> > as
>>> >> > a
>>> >> > user, correct? So mod_cgi is loaded (please confirm).
>>> >> >
>>> >> > David-
>>> >> >
>>> >> > On Wed, Oct 8, 2014 at 12:34 PM, Lonni J Friedman
>>> >> > <netllama at gmail.com>
>>> >> > wrote:
>>> >> >>
>>> >> >> I saved the script in /home/netllama/public_html/cgi-bin/m.py, made
>>> >> >> it
>>> >> >> executable for everyone, and ran it manually:
>>> >> >>
>>> >> >> [netllama at netllama cgi-bin]$ ./m.py
>>> >> >> Content-Type: text/plain;charset=utf-8
>>> >> >>
>>> >> >> Hello World!
>>> >> >>
>>> >> >>
>>> >> >> I then attempted to call it from firefox, and I saw another 500
>>> >> >> Internal Server Error:
>>> >> >> [Wed Oct 08 10:32:06.977104 2014] [cgi:error] [pid 26629] [client
>>> >> >> 127.0.0.1:59320] End of script output before headers: m.py
>>> >> >>
>>> >> >>
>>> >> >> I've already got the SetHandler in the config:
>>> >> >> <Directory /home/*/public_html/cgi-bin>
>>> >> >> AllowOverride Indexes AuthConfig
>>> >> >> Options ExecCGI FollowSymLinks
>>> >> >> SetHandler cgi-script
>>> >> >> AddHandler cgi-script .py
>>> >> >> </Directory>
>>> >> >>
>>> >> >> I'm using apache-2.4.10.
>>> >> >>
>>> >> >>
>>> >> >> On Tue, Oct 7, 2014 at 7:26 PM, David A. Bandel
>>> >> >> <david.bandel at gmail.com>
>>> >> >> wrote:
>>> >> >> > Lonnie,
>>> >> >> >
>>> >> >> > Phew -- yep, this is why I hate this error.
>>> >> >> >
>>> >> >> > Try this:
>>> >> >> > /----start of script----/
>>> >> >> > #!/usr/bin/env python
>>> >> >> > # -*- coding: UTF-8 -*-
>>> >> >> >
>>> >> >> > # enable debugging
>>> >> >> > import cgitb
>>> >> >> > cgitb.enable()
>>> >> >> >
>>> >> >> > print "Content-Type: text/plain;charset=utf-8"
>>> >> >> > print
>>> >> >> >
>>> >> >> > print "Hello World!"
>>> >> >> >
>>> >> >> > ----/end of script/----
>>> >> >> >
>>> >> >> > Your script and this one (call it test.py) should both be
>>> >> >> > executable,
>>> >> >> > owned
>>> >> >> > by the same user, and in the user's cgi-bin directory.
>>> >> >> >
>>> >> >> > Ensure you can run both from the command line, then try to run
>>> >> >> > them
>>> >> >> > in
>>> >> >> > apache by connecting with a browser.
>>> >> >> >
>>> >> >> > If test.py works, but your foo.py script doesn't, the problem is
>>> >> >> > in
>>> >> >> > your
>>> >> >> > foo.py script. Make sure your script is outputting a
>>> >> >> > content-type
>>> >> >> > line
>>> >> >> > (see
>>> >> >> > above).
>>> >> >> >
>>> >> >> > If the test.py does not work, we have a configuration issue.
>>> >> >> >
>>> >> >> > Could also add a "SetHandler: cgi-script" to your cgi-directory
>>> >> >> > stanza.
>>> >> >> >
>>> >> >> > BTW: which version of apache? 2.2 or 2.4 (some declarations
>>> >> >> > changed
>>> >> >> > between
>>> >> >> > these two version numbers)
>>> >> >> >
>>> >> >> >
>>> >> >> > David-
>>> >> >> >
>>> >> >> >
>>> >> >> > On Tue, Oct 7, 2014 at 6:17 PM, Lonni J Friedman
>>> >> >> > <netllama at gmail.com>
>>> >> >> > wrote:
>>> >> >> >>
>>> >> >> >> I definitely have suexec enabled:
>>> >> >> >> [Mon Oct 06 16:09:31.518777 2014] [suexec:notice] [pid 20128]
>>> >> >> >> AH01232:
>>> >> >> >> suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
>>> >> >> >>
>>> >> >> >> Renaming the suexec binary, and retrying didn't really help:
>>> >> >> >> [Tue Oct 07 16:17:15.854011 2014] [cgi:error] [pid 26631]
>>> >> >> >> [client
>>> >> >> >> 127.0.0.1:55657] AH01215: (2)No such file or directory: exec of
>>> >> >> >> '/usr/sbin/suexec' failed
>>> >> >> >> [Tue Oct 07 16:17:15.854671 2014] [cgi:error] [pid 26631]
>>> >> >> >> [client
>>> >> >> >> 127.0.0.1:55657] End of script output before headers: foo.py
>>> >> >> >>
>>> >> >> >> I added a handler to the "<Directory
>>> >> >> >> /home/*/public_html/cgi-bin>"
>>> >> >> >> section of my apache config, but that didn't have any impact on
>>> >> >> >> the
>>> >> >> >> problem.
>>> >> >> >>
>>> >> >> >> Any other suggestions?
>>> >> >> >>
>>> >> >> >>
>>> >> >> >> On Tue, Oct 7, 2014 at 6:28 AM, David A. Bandel
>>> >> >> >> <david.bandel at gmail.com>
>>> >> >> >> wrote:
>>> >> >> >> > Lonnie,
>>> >> >> >> >
>>> >> >> >> > With or without suexec, you will need a handler line:
>>> >> >> >> > AddHandler cgi-script .cgi .py
>>> >> >> >> > (make sure the above line has the pertinent extension, like
>>> >> >> >> > .py
>>> >> >> >> > and
>>> >> >> >> > your
>>> >> >> >> > python script ends in .py)
>>> >> >> >> >
>>> >> >> >> > If using suexec, you should see a line in your error_log:
>>> >> >> >> > suEXEC mechanism enabled
>>> >> >> >> >
>>> >> >> >> > Your script must be runable by suEXEC user. You might find
>>> >> >> >> > it
>>> >> >> >> > easier
>>> >> >> >> > to
>>> >> >> >> > disable suexec (unless you need it). Just rename the suexec
>>> >> >> >> > script
>>> >> >> >> > and
>>> >> >> >> > restart apache and test. If you the script works but you need
>>> >> >> >> > suexec
>>> >> >> >> > (because you're going to have lots of users that need to run
>>> >> >> >> > CGI
>>> >> >> >> > scripts),
>>> >> >> >> > then you'll need to troubleshoot the suexec mess.
>>> >> >> >> >
>>> >> >> >> > David-
>>> >> >> >> >
>>> >> >> >> > On Mon, Oct 6, 2014 at 8:55 PM, Lonni J Friedman
>>> >> >> >> > <netllama at gmail.com>
>>> >> >> >> > wrote:
>>> >> >> >> >>
>>> >> >> >> >> Hi David,
>>> >> >> >> >> I was actually leaning towards some kind of apache
>>> >> >> >> >> configuration
>>> >> >> >> >> issue, but clearly i'm not the expert here, or I would have
>>> >> >> >> >> figured
>>> >> >> >> >> it
>>> >> >> >> >> out myself :)
>>> >> >> >> >>
>>> >> >> >> >> To answer your questions:
>>> >> >> >> >> Its a python script that I'm trying to run.
>>> >> >> >> >> $HOME is on the same partition as / (which is the same
>>> >> >> >> >> partition
>>> >> >> >> >> as
>>> >> >> >> >> the apache $DOCROOT). Its all on a development system, not
>>> >> >> >> >> anything
>>> >> >> >> >> resembling production.
>>> >> >> >> >> The user's UID is greater than 1000.
>>> >> >> >> >> I am using suexec.
>>> >> >> >> >>
>>> >> >> >> >> I'd be happy to answer any other questions.
>>> >> >> >> >>
>>> >> >> >> >> thanks
>>> >> >> >> >>
>>> >> >> >> >>
>>> >> >> >> >> On Mon, Oct 6, 2014 at 6:45 PM, David A. Bandel
>>> >> >> >> >> <david.bandel at gmail.com>
>>> >> >> >> >> wrote:
>>> >> >> >> >> > Lonnie,
>>> >> >> >> >> >
>>> >> >> >> >> > This is one of the most annoying, frustrating errors. All
>>> >> >> >> >> > it
>>> >> >> >> >> > says
>>> >> >> >> >> > is
>>> >> >> >> >> > that
>>> >> >> >> >> > the script didn't work. This may be permissions. It may
>>> >> >> >> >> > be
>>> >> >> >> >> > your
>>> >> >> >> >> > $HOME
>>> >> >> >> >> > mount is non-executable. Difficult to say. You didn't say
>>> >> >> >> >> > what
>>> >> >> >> >> > kind
>>> >> >> >> >> > of
>>> >> >> >> >> > script it was (Perl, PHP, shell). Is the UID of the user
>>> >> >> >> >> > greater
>>> >> >> >> >> > than
>>> >> >> >> >> > 1000?
>>> >> >> >> >> > Are you using suexec?
>>> >> >> >> >> >
>>> >> >> >> >> > I hate this error. Will be either one of the permissions
>>> >> >> >> >> > issues
>>> >> >> >> >> > above
>>> >> >> >> >> > or
>>> >> >> >> >> > some Apache configuration issue (I'm betting on
>>> >> >> >> >> > permissions).
>>> >> >> >> >> >
>>> >> >> >> >> > David-
>>> >> >> >> >> >
>>> >> >> >> >> > On Mon, Oct 6, 2014 at 5:57 PM, Lonni J Friedman
>>> >> >> >> >> > <netllama at gmail.com>
>>> >> >> >> >> > wrote:
>>> >> >> >> >> >>
>>> >> >> >> >> >> Howdy folks,
>>> >> >> >> >> >> Any cgi/apach experts still around? I'm trying to get cgi
>>> >> >> >> >> >> scripts
>>> >> >> >> >> >> working from $USERDIR on a new Fedora system, and they all
>>> >> >> >> >> >> fail
>>> >> >> >> >> >> with
>>> >> >> >> >> >> internal server errors. In the apache error log, I see:
>>> >> >> >> >> >> [cgi:error] End of script output before headers
>>> >> >> >> >> >>
>>> >> >> >> >> >> If I copy the script over to the server $DOCROOT/cgi-bin
>>> >> >> >> >> >> then
>>> >> >> >> >> >> it
>>> >> >> >> >> >> runs
>>> >> >> >> >> >> just fine. So this proves the script itself isn't the
>>> >> >> >> >> >> problem.
>>> >> >> >> >> >> Additionally, non-cgi scripts are served just fine from
>>> >> >> >> >> >> $USERDIR.
>>> >> >> >> >> >> Both the cgi-bin directory and the script itself are
>>> >> >> >> >> >> executable
>>> >> >> >> >> >> for
>>> >> >> >> >> >> all users (755). This is what I've got set in the apache
>>> >> >> >> >> >> config
>>> >> >> >> >> >> for
>>> >> >> >> >> >> the USERDIR directory structure:
>>> >> >> >> >> >>
>>> >> >> >> >> >> <Directory "/home/*/public_html">
>>> >> >> >> >> >> AllowOverride FileInfo AuthConfig Limit Indexes
>>> >> >> >> >> >> Options MultiViews Indexes SymLinksIfOwnerMatch
>>> >> >> >> >> >> ExecCGI
>>> >> >> >> >> >> Require method GET POST OPTIONS
>>> >> >> >> >> >> </Directory>
>>> >> >> >> >> >>
>>> >> >> >> >> >> <Directory /home/*/public_html/cgi-bin>
>>> >> >> >> >> >> AllowOverride Indexes AuthConfig
>>> >> >> >> >> >> Options ExecCGI
>>> >> >> >> >> >> SetHandler cgi-script
>>> >> >> >> >> >> </Directory>
>>> >> >> >> >> >>
>>> >> >> >> >> >>
>>> >> >> >> >> >> Anyone know what I'm missing?
>>> >> >> >> >> >>
>>> >> >> >> >> >> thanks
>>> >> >> >> >>
>>>
>>>
>>> --
>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> L. Friedman netllama at gmail.com
>>> LlamaLand http://netllama.linux-sxs.org
>>>
>>> _______________________________________________
>>> Linux-users mailing list
>>> Linux-users at linux-sxs.org
>>> http://mailman.celestial.com/mailman/listinfo/linux-users
>>>
>>
>>
>>
>> --
>> Two things are infinite: the universe and human stupidity; and I'm not
>> sure about the the universe. -- Albert Einstein
>> Visit my web page at: http://david.bandel.us/
>>
>> _______________________________________________
>> Linux-users mailing list
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>>
>
>
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--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
L. Friedman netllama at gmail.com
LlamaLand http://netllama.linux-sxs.org
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