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Re: [PATCH] bracketed paste support


From: Pádraig Brady
Subject: Re: [PATCH] bracketed paste support
Date: Wed, 29 Oct 2014 22:25:08 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2

On 10/29/2014 09:42 PM, Daniel Colascione wrote:
> On 10/29/2014 09:35 PM, Pádraig Brady wrote:
>> On 10/27/2014 10:35 PM, Daniel Colascione wrote:
>>
>>> address@hidden enable-bracketed-paste
>>> address@hidden enable-bracketed-paste
>>> +If set to @samp{on} and the terminal supports bracketed paste mode,
>>> +configure it to insert each paste into the editing buffer as a string
>>> +instead of treating the characters pasted as normal input, preventing
>>> +inadvertent execution of pasted commands.  The default is @samp{on}.
>>
>> I see this defaults on.
>> Does this mean one can't paste command sequences to readline now?
> 
> Well, I don't know whether Chet left the feature enabled by default. I hope 
> he did, though, since preventing execution of pasted commands is one of the 
> feature's key benefits. In bash, you should be able to execute a pasted 
> command sequence by typing RET after the paste, but a paste by itself should 
> never begin execution.
> 
> For better or worse, people copy and paste commands from websites all the 
> time. Even if a bit of shell looks innocuous, a malicious bit of JavaScript 
> could change the pasted text at the last second without the user being aware 
> of the switch. (Tynt uses this technique to slightly less malicious ends.) If 
> pasting in a terminal immediately begins execution, there's no opportunity to 
> review pasted code. With bracketed paste support, the shell requires 
> additional user interaction after a paste to begin execution, making this 
> attack much less effective.

Requiring the extra RET after pasting shouldn't be too onerous.

I found this to be a good summary:
http://cirw.in/blog/bracketed-paste

Thanks for the extra info!
Pádraig.



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