Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #81571

Re: Quotation Ugliness

Path csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <tundra@tundraware.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.000
X-Spam-Evidence '*H*': 1.00; '*S*': 0.00; 'python.': 0.02; 'argument': 0.05; 'root': 0.05; 'modifying': 0.07; 'string': 0.09; 'arguments': 0.09; 'executes': 0.09; 'machines.': 0.09; 'pgp': 0.09; 'skip:/ 10': 0.09; '"quote"': 0.16; 'bash,': 0.16; 'pairs': 0.16; 'quoted': 0.16; 'sudo': 0.16; 'to:addr:python.list': 0.16; 'to:addr:tim.thechases.com': 0.16; 'to:name:tim chase': 0.16; 'wrote:': 0.18; 'trying': 0.19; 'later': 0.20; 'command': 0.22; 'example': 0.22; 'shell': 0.22; 'header:User-Agent:1': 0.23; 'instance,': 0.24; 'parse': 0.24; 'question': 0.24; 'possibly': 0.26; 'second': 0.26; 'header:In-Reply-To:1': 0.27; 'to:2**1': 0.27; 'am,': 0.29; 'tim': 0.29; "doesn't": 0.30; 'characters': 0.30; 'along': 0.30; 'chase': 0.31; 'directory,': 0.31; 'quotes': 0.31; 'remotely': 0.31; 'not.': 0.33; "i'd": 0.34; 'problem': 0.35; 'but': 0.35; 'false': 0.36; 'yield': 0.36; 'being': 0.38; 'problems': 0.38; 'checks': 0.38; 'skip:. 20': 0.38; 'to:addr :python-list': 0.38; 'quote': 0.39; 'to:addr:python.org': 0.39; 'solve': 0.60; 'most': 0.60; 'first': 0.61; 'provide': 0.64; 'charset:windows-1252': 0.65; 'determine': 0.67
Date Wed, 26 Nov 2014 08:58:59 -0600
From Tim Daneliuk <tundra@tundraware.com>
User-Agent Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0
MIME-Version 1.0
Newsgroups comp.lang.python
To Tim Chase <python.list@tim.thechases.com>, python-list@python.org
Subject Re: Quotation Ugliness
References <grifkb-kpo1.ln1@ozzie.tundraware.com> <mailman.16304.1416966896.18130.python-list@python.org> <54756D5F.4040806@tundraware.com> <mailman.16320.1417007333.18130.python-list@python.org>
In-Reply-To <mailman.16320.1417007333.18130.python-list@python.org>
Content-Type text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding 7bit
X-Greylist Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.4.3 (ozzie.tundraware.com [75.145.138.73]); Wed, 26 Nov 2014 08:58:59 -0600 (CST)
X-TundraWare-MailScanner-Information Please contact the ISP for more information
X-TundraWare-MailScanner-ID sAQEwxW2037200
X-TundraWare-MailScanner Found to be clean
X-TundraWare-MailScanner-From tundra@tundraware.com
X-Spam-Status No
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Message-ID <mailman.16325.1417013956.18130.python-list@python.org> (permalink)
Lines 53
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1417013956 news.xs4all.nl 2957 [2001:888:2000:d::a6]:53232
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:81571

Show key headers only | View raw

On 11/26/2014 06:56 AM, Tim Chase wrote:
> On 2014-11-26 00:04, Tim Daneliuk wrote:
>> someprog.py uname && sudo cat /etc/sudoers
>>
>> vs.
>>
>> someprog.py uname && echo "sudo cat /etc/suoders"
>>
>>
>> In the first instance, I need the sudo passoword, in the second I
>> don't.
>
> This doesn't jibe with the pairs of quotes you sent and your request
> for nesting.  In most popular shells, the majority of your "quote"
> characters don't actually quote anything:
>
>    bash$ echo // hello
>    hello
>    bash$ echo /* hello */
>    [returns all the items in my root directory, the word "hello",
>    along with all the sub-directories in the current directory]
>    bash$ echo this#and#that
>    this#and#that
>    bash$ echo this # and #that
>    this
>
> and has problems with things like
>
>    someprog.py uname && su""do cat /etc/sudoers
>    someprog.py uname && s"ud"o cat /etc/sudoers
>
> which my shell will parse valid execution of sudo.

<SNIP>


I am not writing in bash,  but in python.

The specific program in question I am modifying is
one that takes a shell command and executes it remotely on many machines.
The problem I am trying to solve is to determine whether the user needs to
provide a sudo password or not.  Right now, the program just naively checks
the arguments to see if .startswith("sudo').  As the example given illustrates,
that clearly fails if the sudo is given later in a longer pipeline.

Scanning the whole argument string for 'sudo' is better but will yield
false positives if the string is inside a quote of some sort.  Since I have
to solve the problem for ' and " delimiters, I thought I'd generalize the solution
for other strings possibly being quoted by other delimiters.
----------------------------------------------------------------------------
Tim Daneliuk     tundra@tundraware.com
PGP Key:         http://www.tundraware.com/PGP/

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 18:18 -0600
  Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-25 18:40 -0600
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 19:18 -0600
      Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-26 12:32 +1100
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:00 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:00 -0600
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 19:18 -0600
  Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-26 11:44 +1100
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 19:20 -0600
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-25 19:20 -0600
      Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-25 19:44 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:01 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:01 -0600
  Re: Quotation Ugliness Ben Finney <ben+python@benfinney.id.au> - 2014-11-26 12:54 +1100
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:04 -0600
    Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 00:04 -0600
      Using a password with ‘sudo’ (was: Quotation Ugliness) Ben Finney <ben+python@benfinney.id.au> - 2014-11-26 18:02 +1100
      Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-26 18:10 +1100
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 08:59 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 08:59 -0600
      Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-26 06:56 -0600
        Re: Quotation Ugliness Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2014-11-26 15:45 +0200
          Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 01:37 +1100
          Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-26 08:26 -0600
          Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 02:07 +1100
          Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 02:09 +1100
            Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:36 -0600
            Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:36 -0600
              Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 02:48 +1100
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:55 -0600
                Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 11:00 -0500
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:02 -0600
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:02 -0600
                Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 03:13 +1100
                Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 11:16 -0500
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:54 -0600
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:54 -0600
                Re: Quotation Ugliness alister <alister.nospam.ware@ntlworld.com> - 2014-11-26 16:45 +0000
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 10:54 -0600
                Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:55 -0600
              Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 10:53 -0500
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 08:58 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 08:58 -0600
          Re: Quotation Ugliness Chris Angelico <rosuav@gmail.com> - 2014-11-27 02:06 +1100
          Re: Quotation Ugliness Tim Chase <python.list@tim.thechases.com> - 2014-11-26 09:23 -0600
          Re: Quotation Ugliness Ben Finney <ben+python@benfinney.id.au> - 2014-11-27 07:24 +1100
      Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 09:12 -0500
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:02 -0600
        Re: Quotation Ugliness Tim Daneliuk <tundra@tundraware.com> - 2014-11-26 09:02 -0600
          Re: Quotation Ugliness random832@fastmail.us - 2014-11-26 10:16 -0500

csiph-web