Date: Fri, 01 Dec 2006 16:41:08 +0000 From: Alex Zbyslaw <xfb52@dial.pipex.com> To: Ray Still <rastill@shaw.ca> Cc: freebsd-questions@freebsd.org Subject: Re: Fw: Re: problem with script execution Message-ID: <45705B24.8040509@dial.pipex.com> In-Reply-To: <007101c7155f$f1fb6790$6700a8c0@New> References: <004601c71559$f2d645f0$6700a8c0@New> <45704A22.9060100@dial.pipex.com> <007101c7155f$f1fb6790$6700a8c0@New>
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Ray Still wrote:
>
> Alex Zbyslaw wrote:
>
>> Ray Still wrote:
>>
>>>>> Just out of curiosity: What is the "echo * |" supposed to do? From my
>>>>> point of view the shell will expand "*" to the list of files and
>>>>> directories in PWD, so "echo *" acts like a simple ls in this
>>>>> context.
>>>>> This list is piped to sudo. But what does sudo do with these?
>>>>
>>>>
>>>>
>>>> sorry, I didn't want to show my passwords, so I replaced it with an
>>>> astrix. the password of course is being read from the pipe by sudo
>>>> because of the -S option.
>>>
>>>
>> Probably nothing to do with your original problem, but you do know
>> that you can allow sudo to execute certain commands without a
>> password? Passwords in shell scripts isn't exactly ideal...
>
>
> I am aware of the security issues, but in this case I think it's the
> best option because:
>
> 1) any one who can login to the machine also knows root passwords.
> 2) this script lives in a directory that is password protected by apache.
> 3) I don't like the thought of turning off passwords.
> so if you can see the script, you won't learn anything you don't
> already know.
> am I totally out to lunch?
IMHO, putting passwords in a script is a bad idea and putting a root
password in a script is just asking for trouble. Sure, when all is
well, all your users know it anyway. Then one day you forget and add a
user who doesn't know it, or you distribute the script somewhere
external by accident, or someone hacks in to your machine and you have
given them the password on a plate.
From what I understand, this script is being run only from apache, and
you have password protected it from the apache server. So the only user
you need to allow to run the script without a password is "apache". As
you have it, any user on the system who can read the file can already
run it without a password unless you have directory/script permissions
set up to lock them out - apache password protection only protects you
when the script is accessed through apache. If you use sudo to allow
apache to run the script passwordless, then to run the script as apache
you either need to be the apache server or root, so random logged in
users can't run it without knowing the root password unless you let them.
What I think sudo (correctly set up to only allow apache to run the
script) buys you is this:
1) Your password is not visible anywhere so can't be given away by
accident.
2) The script is exactly as well protected for web use as when you
just include the password in the script. Any web user who can click on
the right link and supply the apache authentication can run the script.
If you feel apache authentication is enough protection, then
passwordless sudo changes nothing, as far as I can see.
3) Random users gaining access to your machine cannot run the script
without knowing the root password. Right now any user on your system
who has execute permission in the script can run it without knowing the
root password.
My tuppence,
--Alex
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