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Allow all CLI commands to take arguments from stdin or a file, to avoid caps being visible to other local users #840

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opened 2009-11-22 20:49:03 +00:00 by daira · 6 comments
daira commented 2009-11-22 20:49:03 +00:00
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From code:docs/known_issues.txt :

=== command-line arguments are leaked to other local users ===

Remember that command-line arguments are visible to other users (through the ps command, or the windows Process Explorer tool), so if you are using a Tahoe-LAFS node on a shared host, other users on that host will be able to see (and copy) any caps that you pass as command-line arguments. This includes directory caps that you set up with the "tahoe add-alias" command. Use "tahoe create-alias" for that purpose instead.

==== how to manage it ====

Bypass add-alias and edit the NODEDIR/private/aliases file directly, [...] By entering the dircap through the editor, the command-line arguments are bypassed, and other users will not be able to see them. [...]

Starting in Tahoe-LAFS v1.3.0, there is a "tahoe create-alias" command that does this for you.

This workaround using aliases is ugly -- adding a persistent alias for an argument that might only be used once has poor usability, leaving around aliases may constitute a privacy issue, and firing up an editor is quite a heavyweight solution.

Proposed feature: if a CLI command sees an argument of the form "@filename", then it substitutes the contents of that file into the command arguments in place of "@filename" (taking newlines as argument separators). "@" on its own does the same thing for standard input. If the file cannot be read then the command fails with no effect.

(In other words, @filename works similarly to the Unix shell syntax cat filename, except that the latter wouldn't solve the problem because it passes the file contents via the command line.)

The syntax @filename is chosen because it seems to be a semi-convention, at least in developer tools (e.g. MSVC++, javac, javadoc use it), and because @ does not need to be quoted on either Unix or Windows.

From code:docs/known_issues.txt : >=== command-line arguments are leaked to other local users === >Remember that command-line arguments are visible to other users (through the `ps` command, or the windows Process Explorer tool), so if you are using a Tahoe-LAFS node on a shared host, other users on that host will be able to see (and copy) any caps that you pass as command-line arguments. This includes directory caps that you set up with the "`tahoe add-alias`" command. Use "`tahoe create-alias`" for that purpose instead. >==== how to manage it ==== >Bypass `add-alias` and edit the `NODEDIR/private/aliases` file directly, [...] By entering the dircap through the editor, the command-line arguments are bypassed, and other users will not be able to see them. [...] >Starting in Tahoe-LAFS v1.3.0, there is a "`tahoe create-alias`" command that does this for you. This workaround using aliases is ugly -- adding a persistent alias for an argument that might only be used once has poor usability, leaving around aliases may constitute a privacy issue, and firing up an editor is quite a heavyweight solution. Proposed feature: if a CLI command sees an argument of the form "`@filename`", then it substitutes the contents of that file into the command arguments in place of "`@filename`" (taking newlines as argument separators). "`@`" on its own does the same thing for standard input. If the file cannot be read then the command fails with no effect. (In other words, `@filename` works similarly to the Unix shell syntax ``cat filename``, except that the latter wouldn't solve the problem because it passes the file contents via the command line.) The syntax `@filename` is chosen because it seems to be a semi-convention, at least in developer tools (e.g. MSVC++, javac, javadoc use it), and because `@` does not need to be quoted on either Unix or Windows.
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c/code-frontend-cli
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t/defect
v/1.5.0
 labels 2009-11-22 20:49:03 +00:00
daira added this to the undecided milestone 2009-11-22 20:49:03 +00:00
daira commented 2009-11-23 02:12:52 +00:00
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This is an enhancement to Tahoe; the defect is in the OS :-)

This is an enhancement to Tahoe; the defect is in the OS :-)
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t/enhancement
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t/defect
 labels 2009-11-23 02:12:52 +00:00
daira commented 2009-11-23 04:34:59 +00:00
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Incidentally, another reason to support this is so that you don't have to remember the ridiculously complicated (and just plain ridiculous, in many ways) shell quoting and glob-expansion rules:

Incidentally, another reason to support this is so that you don't have to remember the ridiculously complicated (and just plain ridiculous, in many ways) shell quoting and glob-expansion rules: * <http://www.mpi-inf.mpg.de/~uwe/lehre/unixffb/quoting-guide.html> * <http://www.dwheeler.com/essays/fixing-unix-linux-filenames.html>
azazel commented 2009-11-24 11:52:13 +00:00
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I do not find the alias usage ugly as you just have to create an alias for the root of the tree that you want to use. After that, you can use standard slashes "addressing". By the way, it would be useful to have the arguments and options for a command to be read from a file, but i would rather use a more "normal" way of specifying it like a -c or -f option followed by a file path, and where the specified file contains options and arguments in INI or dict like syntax.
I would prefer for the stdin to be used for data, rather than options or arguments:-). In any case a "-" seems a more standardized way of specifying it in unix world.

I do not find the alias usage ugly as you just have to create an alias for the root of the tree that you want to use. After that, you can use standard slashes "addressing". By the way, it would be useful to have the arguments and options for a command to be read from a file, but i would rather use a more "normal" way of specifying it like a -c or -f option followed by a file path, and where the specified file contains options and arguments in INI or dict like syntax. I would prefer for the stdin to be used for data, rather than options or arguments:-). In any case a "-" seems a more standardized way of specifying it in unix world.
azazel commented 2009-11-24 12:01:36 +00:00
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Replying to azazel:

where the specified file contains options and arguments in INI or dict like syntax.

of course there is no need of using another syntax, a file containing just a line filled with command line options and arguments can be good enough, even if not so comfortable when there are many long arguments

Replying to [azazel](/tahoe-lafs/trac/issues/840#issuecomment-374544): > where the specified file contains options and arguments in INI or dict like syntax. of course there is no need of using another syntax, a file containing just a line filled with command line options and arguments can be good enough, even if not so comfortable when there are many long arguments
daira commented 2009-11-24 19:21:37 +00:00
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We're going to have to agree to differ about it being ugly to have to use aliases as a workaround for leakage of caps on command lines. To me, aliases are similar to variables in a programming language -- it's fine to create an alias/variable for something that will be referred to several times, or even twice, but you don't typically create a variable for every subexpression that is only used once. (Yes, I know there can be exceptions to that.) If a language or UI requires that, then it's imposing unnecessary mental overhead in forcing a programmer or user to choose temporary names.

When caps become short enough to fit on a single line, so that they are more easily cut-and-pasteable, and are real URIs (#432 and other tickets listed there), this is likely to become more important in practice. For example, say that I receive a Tahoe directory URI in an encrypted email, and want to copy the contents to a local tree. I should be able to just do tahoe cp -r @ dest and then paste in the URI, without having to set up an alias that I may never refer to again. (If I did want to refer to it again, I'd go back to the email.)

The @ syntax is preferable precisely because it isn't an option argument -- it's metasyntax that gets substituted before any arguments have been parsed -- and therefore it shouldn't look like an option argument. For instance, I think the syntax tahoe cp -r @ dest}} in the example above is less weird and easier to remember than ```tahoe cp -r -f - dest, which looks as though -f has the same status as other options like -r, rather than -f - being a substitution.

@ is also something that you could imagine becoming a more widely-used convention, whereas any option-like syntax would inevitably clash with other options and so could never become a convention.

Replying to [comment:4 azazel]:

of course there is no need of using another syntax, a file containing just a line filled with command line options and arguments can be good enough, even if not so comfortable when there are many long arguments

Given that arguments could be on separate lines (LF or CRLF would be equivalent to an argument separator), I don't think long arguments are a particular problem.

We're going to have to agree to differ about it being ugly to have to use aliases as a workaround for leakage of caps on command lines. To me, aliases are similar to variables in a programming language -- it's fine to create an alias/variable for something that will be referred to several times, or even twice, but you don't typically create a variable for every subexpression that is only used once. (Yes, I know there can be exceptions to that.) If a language or UI requires that, then it's imposing unnecessary mental overhead in forcing a programmer or user to choose temporary names. When caps become short enough to fit on a single line, so that they are more easily cut-and-pasteable, and are real URIs (#432 and other tickets listed there), this is likely to become more important in practice. For example, say that I receive a Tahoe directory URI in an encrypted email, and want to *copy* the contents to a local tree. I should be able to just do `tahoe cp -r @ dest` and then paste in the URI, without having to set up an alias that I may never refer to again. (If I did want to refer to it again, I'd go back to the email.) The `@` syntax is preferable precisely because it isn't an option argument -- it's metasyntax that gets substituted before any arguments have been parsed -- and therefore it shouldn't look like an option argument. For instance, I think the syntax `tahoe cp -r @ dest}} in the example above is less weird and easier to remember than ```tahoe cp -r -f - dest`, which looks as though `-f` has the same status as other options like `-r`, rather than `-f -` being a substitution. `@` is also something that you could imagine becoming a more widely-used convention, whereas any option-like syntax would inevitably clash with other options and so could never become a convention. Replying to [comment:4 azazel]: > of course there is no need of using another syntax, a file containing just a line filled with command line options and arguments can be good enough, even if not so comfortable when there are many long arguments Given that arguments could be on separate lines (LF or CRLF would be equivalent to an argument separator), I don't think long arguments are a particular problem.
daira changed title from Allow all CLI commands to take arguments from stdin or a file, to avoid caps being visible to other users to Allow all CLI commands to take arguments from stdin or a file, to avoid caps being visible to other local users 2009-11-24 19:21:37 +00:00
daira commented 2014-05-30 18:39:05 +00:00
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"@" has unfortunately been used up for a different purpose by [3798d9946e1f62cc7b9b83c641f6f0eb21864a2c/trunk].

I suggest "!" instead, because it is not a shell metacharacter for either Windows cmd.exe or most Unix shells (outside []).

"@" has unfortunately been used up for a different purpose by [3798d9946e1f62cc7b9b83c641f6f0eb21864a2c/trunk]. I suggest "!" instead, because it is not a shell metacharacter for either Windows `cmd.exe` or most Unix shells (outside `[]`).
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kw:release-blocker

   
kw:reliability

   
kw:relnotes

   
kw:remote

   
kw:removable

   
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kw:rename

   
kw:renew

   
kw:repair

   
kw:replace

   
kw:report

   
kw:repository

   
kw:research

   
kw:reserved_space

   
kw:response-needed

   
kw:response-time

   
kw:restore

   
kw:retrieve

   
kw:retry

   
kw:review

   
kw:review-needed

   
kw:reviewed

   
kw:revocation

   
kw:roadmap

   
kw:rollback

   
kw:rpm

   
kw:rsa

   
kw:rss

   
kw:rst

   
kw:rsync

   
kw:rusty

   
kw:s3

   
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kw:same-origin

   
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kw:scalability

   
kw:scaling

   
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kw:schema

   
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kw:scripts

   
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kw:security

   
kw:self-contained

   
kw:server

   
kw:servermap

   
kw:servers-of-happiness

   
kw:service

   
kw:setup

   
kw:setup.py

   
kw:setup_requires

   
kw:setuptools

   
kw:setuptools_darcs

   
kw:sftp

   
kw:shared

   
kw:shareset

   
kw:shell

   
kw:signals

   
kw:simultaneous

   
kw:six

   
kw:size

   
kw:slackware

   
kw:slashes

   
kw:smb

   
kw:sneakernet

   
kw:snowleopard

   
kw:socket

   
kw:solaris

   
kw:space

   
kw:space-efficiency

   
kw:spam

   
kw:spec

   
kw:speed

   
kw:sqlite

   
kw:ssh

   
kw:ssh-keygen

   
kw:sshfs

   
kw:ssl

   
kw:stability

   
kw:standards

   
kw:start

   
kw:startup

   
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kw:static-analysis

   
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kw:status

   
kw:stdeb

   
kw:storage

   
kw:streaming

   
kw:strports

   
kw:style

   
kw:stylesheet

   
kw:subprocess

   
kw:sumo

   
kw:survey

   
kw:svg

   
kw:symlink

   
kw:synchronous

   
kw:tac

   
kw:tahoe-*

   
kw:tahoe-add-alias

   
kw:tahoe-admin

   
kw:tahoe-archive

   
kw:tahoe-backup

   
kw:tahoe-check

   
kw:tahoe-cp

   
kw:tahoe-create-alias

   
kw:tahoe-create-introducer

   
kw:tahoe-debug

   
kw:tahoe-deep-check

   
kw:tahoe-deepcheck

   
kw:tahoe-lafs-trac-stream

   
kw:tahoe-list-aliases

   
kw:tahoe-ls

   
kw:tahoe-magic-folder

   
kw:tahoe-manifest

   
kw:tahoe-mkdir

   
kw:tahoe-mount

   
kw:tahoe-mv

   
kw:tahoe-put

   
kw:tahoe-restart

   
kw:tahoe-rm

   
kw:tahoe-run

   
kw:tahoe-start

   
kw:tahoe-stats

   
kw:tahoe-unlink

   
kw:tahoe-webopen

   
kw:tahoe.css

   
kw:tahoe_files

   
kw:tahoewapi

   
kw:tarball

   
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kw:tempfile

   
kw:templates

   
kw:terminology

   
kw:test

   
kw:test-and-set

   
kw:test-from-egg

   
kw:test-needed

   
kw:testgrid

   
kw:testing

   
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kw:throttling

   
kw:ticket999-s3-backend

   
kw:tiddly

   
kw:time

   
kw:timeout

   
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kw:to

   
kw:to-be-closed-on-2011-08-01

   
kw:tor

   
kw:tor-protocol

   
kw:torsocks

   
kw:tox

   
kw:trac

   
kw:transparency

   
kw:travis

   
kw:travis-ci

   
kw:trial

   
kw:trickle

   
kw:trivial

   
kw:truckee

   
kw:tub

   
kw:tub.location

   
kw:twine

   
kw:twistd

   
kw:twistd.log

   
kw:twisted

   
kw:twisted-14

   
kw:twisted-trial

   
kw:twitter

   
kw:twn

   
kw:txaws

   
kw:type

   
kw:typeerror

   
kw:ubuntu

   
kw:ucwe

   
kw:ueb

   
kw:ui

   
kw:unclean

   
kw:uncoordinated-writes

   
kw:undeletable

   
kw:unfinished-business

   
kw:unhandled-error

   
kw:unhappy

   
kw:unicode

   
kw:unit

   
kw:unix

   
kw:unlink

   
kw:update

   
kw:upgrade

   
kw:upload

   
kw:upload-helper

   
kw:uri

   
kw:url

   
kw:usability

   
kw:use-case

   
kw:utf-8

   
kw:util

   
kw:uwsgi

   
kw:ux

   
kw:validation

   
kw:variables

   
kw:vdrive

   
kw:verify

   
kw:verlib

   
kw:version

   
kw:versioning

   
kw:versions

   
kw:video

   
kw:virtualbox

   
kw:virtualenv

   
kw:vista

   
kw:visualization

   
kw:visualizer

   
kw:vm

   
kw:volunteergrid2

   
kw:volunteers

   
kw:vpn

   
kw:wapi

   
kw:warners-opinion-needed

   
kw:warning

   
kw:weapi

   
kw:web

   
kw:web.port

   
kw:webapi

   
kw:webdav

   
kw:webdrive

   
kw:webport

   
kw:websec

   
kw:website

   
kw:websocket

   
kw:welcome

   
kw:welcome-page

   
kw:welcomepage

   
kw:wiki

   
kw:win32

   
kw:win64

   
kw:windows

   
kw:windows-related

   
kw:winscp

   
kw:workaround

   
kw:world-domination

   
kw:wrapper

   
kw:write-enabler

   
kw:wui

   
kw:x86

   
kw:x86-64

   
kw:xhtml

   
kw:xml

   
kw:xss

   
kw:zbase32

   
kw:zetuptoolz

   
kw:zfec

   
kw:zookos-opinion-needed

   
kw:zope

   
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p/blocker

   
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p/major

   
p/minor

   
p/normal

   
p/supercritical

   
p/trivial

   
r/cannot reproduce

   
r/duplicate

   
r/fixed

   
r/invalid

   
r/somebody else's problem

   
r/was already fixed

   
r/wontfix

   
r/worksforme

   
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v/1.8β

   
v/1.9.0

   
v/1.9.0-s3branch

   
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v/1.9.2

   
v/1.9.2a1

   
v/cloud-branch

   
v/unknown
No labels
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Reference: tahoe-lafs/trac#840
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