8-bit patch for zle_tricky.c

8-bit patch for zle_tricky.c

[Zefram]

-----BEGIN PGP SIGNED MESSAGE-----

Here's my attempt at making zle_tricky.c 8-bit clean.  The patch
is from 2.6-beta18-test1.  Zoltan's start at the task, metafying
and unmetafying the line around completion, is pretty much what I
had in mind anyway, so I've worked from that.  The changes needed
to make the completion listing unmetafy everything are impressively
easy.

The bulk of the patch is actually comment reformatting throughout the
file, to match the style used elsewhere.  I rewrote several of the
comments and added more.  The patches to utils.c add a niceztrlen(),
and fix a couple of minor bugs.

Although nicefputs() is no longer used, and nicestrlen() won't be
quite soon, I think it would be unwise to try renaming nicezputs()
and niceztrlen() to them.  It would cause confusion.  I think it
would also be reasonable to leave them in, even when they're not
used, as nicefputs() is very convenient for producing debugging
output.

There are several bits of zsh remaining to be made 8-bit clean.
In particular there are a lot of outputs that need to be unmetafied,
including the prompt code.  I'll fix these in another patch.

There is also a very serious problem in tokenisation: the metafied
line is tokenised as if it were literal text.  For example:

% echo foo^@bar
foo  bar

Note the double space.  What happens is that foo^@bar is encoded as
"foo\203 bar", and the tokeniser splits this into "foo\203" and
"bar".  The former of these strings is illegal as a metafied string, but
if it happens to be terminated by two NULs then it unmetafies to "foo ".
I think the lexer will need significant changes to support metafication.
It's probably best to make the hgetc/hungetc history interface binary,
but leave ingetc/inungetc metafied.  I'll leave it to others that know
that area of the code better.

 -zefram

begin 644 completion_8bit_patch.gz
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Re: 8-bit patch for zle_tricky.c

[Zoltan Hidvegi]

[-- Attachment #1: Type: application/pgp, Size: 12274 bytes --]

Re: 8-bit patch for zle_tricky.c

[Zoltan Hidvegi]

[-- Attachment #1: Type: application/pgp, Size: 2918 bytes --]

Re: 8-bit patch for zle_tricky.c

[Zefram]

>Well I do not think that this bug is serious.  The biggest advantage of
>metafication is that does not requite significant changes in the lexer.  I
>see that in your patch you added IBLANK, INBLANK and ISPECIAL types to the
>null character.  I still think that null only needs IMETA.  Adding IBLANK
>just complicates thinkg in the lexer and I do not think it is necessary.

The bug has effect regardless of whether NUL is treated as a blank or
not.  I added the IBLANK etc. bits on the grounds that NUL ought to be
treated as a blank, just as it's in $IFS.  But the shell is indeed
perfectly usable either way, so I won't contest this issue.

>You may ask then why I added it to IFS.  The main reason for that was that
>nulls cannot be passed in arguments to external commands.  But
>iblank/inblank used only on the shell input which does not have this
>limitation.

Adding it to $IFS has no effect in this matter, because zsh does not do
field splitting on normal words.  (It should, at least if SH_WORD_SPLIT
is set.)

-zefram

Re: 8-bit patch for zle_tricky.c

[Bart Schaefer]

On May 20,  7:21pm, Zoltan Hidvegi wrote:
} Subject: Re: 8-bit patch for zle_tricky.c
}
} > Adding it to $IFS has no effect in this matter, because zsh does not do
} > field splitting on normal words.  (It should, at least if SH_WORD_SPLIT
} > is set.)
} 
} I do not think so.  Neither bash nor ksh93 does this.  Look:
} 
} % ksh
} $ count () { echo $# ; }
} $ IFS=/
} $ count as/df/gh
} 1
} 
} SH_WORD_SPLIT only changes the result of substitutions.

zsh% /bin/sh
$ IFS=/
$ echo/bar
bar
$ exit/1
zsh% echo $?
1
zsh%

-- 
Bart Schaefer                             Brass Lantern Enterprises
http://www.well.com/user/barts            http://www.nbn.com/people/lantern

New male in /home/schaefer:
>N  2 Justin William Schaefer  Sat May 11 03:43  53/4040  "Happy Birthday"

Re: 8-bit patch for zle_tricky.c

[Zoltan Hidvegi]

> >Well I do not think that this bug is serious.  The biggest advantage of
> >metafication is that does not requite significant changes in the lexer.  I
> >see that in your patch you added IBLANK, INBLANK and ISPECIAL types to the
> >null character.  I still think that null only needs IMETA.  Adding IBLANK
> >just complicates things in the lexer and I do not think it is necessary.
> 
> The bug has effect regardless of whether NUL is treated as a blank or
> not.  I added the IBLANK etc. bits on the grounds that NUL ought to be

I meant that for the lexer it is simpler to treat null as non-blank.  The bug
was there but my latest patch fixed it I hope.

> >You may ask then why I added it to IFS.  The main reason for that was that
> >nulls cannot be passed in arguments to external commands.  But
> >iblank/inblank used only on the shell input which does not have this
> >limitation.
> 
> Adding it to $IFS has no effect in this matter, because zsh does not do
> field splitting on normal words.  (It should, at least if SH_WORD_SPLIT
> is set.)

I do not think so.  Neither bash nor ksh93 does this.  Look:

% ksh
$ count () { echo $# ; }
$ IFS=/
$ count as/df/gh
1

SH_WORD_SPLIT only changes the result of substitutions.

Zoltan

Re: 8-bit patch for zle_tricky.c

[Zefram]

>I do not think so.  Neither bash nor ksh93 does this.  Look:
>
>% ksh
>$ count () { echo $# ; }
>$ IFS=/
>$ count as/df/gh
>1
>
>SH_WORD_SPLIT only changes the result of substitutions.

Hmm.  ksh doesn't field split there, but sh does.  I think we should
eventually have an option to emulate this, but it's not essential.

-zefram

Re: 8-bit patch for zle_tricky.c

[Zoltan Hidvegi]

> } > Adding it to $IFS has no effect in this matter, because zsh does not do
> } > field splitting on normal words.  (It should, at least if SH_WORD_SPLIT
> } > is set.)
> } 
> } I do not think so.  Neither bash nor ksh93 does this.  Look:
> } 
> } % ksh
> } $ count () { echo $# ; }
> } $ IFS=/
> } $ count as/df/gh
> } 1
> } 
> } SH_WORD_SPLIT only changes the result of substitutions.
> 
> zsh% /bin/sh
> $ IFS=/
> $ echo/bar
> bar
> $ exit/1
> zsh% echo $?
> 1
> zsh%

Yes, the original Bourne Shell used IFS in the lexer to separate words but
I think that this does not conform the POSIX Shell and Utilities standard.
Also it may be a security hole if IFS is exported.  That's why bash and
ksh does not use IFS here, and zsh should not use it either.

Zoltan

Re: 8-bit patch for zle_tricky.c

[Zefram]

>Yes, the original Bourne Shell used IFS in the lexer to separate words but
>I think that this does not conform the POSIX Shell and Utilities standard.

It's been a while since I read the standard, and I don't have access to
a copy any more, but I'm pretty sure it's required.  I needed to check
this particular matter for some reason.  Can someone with a POSIX shell
or the standard check this?

>Also it may be a security hole if IFS is exported.  That's why bash and
>ksh does not use IFS here, and zsh should not use it either.

It is a security hole, but (a) setuid shell scripts are insecure anyway
on most systems, and (b) there's a way to avoid it:

#!/bin/sh
IFS=' 	
'
echo Note that IFS is now safe.

The above, as a shell script, is secure if setuid on, for example,
Solaris.  Anyone writing setuid scripts should know this technique.

Another solution would be to remove sensitive parameters such as IFS
and LD_* on initialisation if the PRIVILEGED option is set (euid !=
ruid).  Note that a script can already totally clear the exported
environment by doing `typeset +x -m \*`.

-zefram

Re: 8-bit patch for zle_tricky.c

[Hrvoje Niksic]

In your mail, you said:
> >I do not think so.  Neither bash nor ksh93 does this.  Look:
> >
> >% ksh
> >$ count () { echo $# ; }
> >$ IFS=/
> >$ count as/df/gh
> >1
> >
> >SH_WORD_SPLIT only changes the result of substitutions.
> 
> Hmm.  ksh doesn't field split there, but sh does.  I think we should
> eventually have an option to emulate this, but it's not essential.

I think that bash intentionally avoids word-splitting in these cases, to
close the infamous IFS-security hole in sh, for setuid scripts/programs.

-- 
hniksic@srce.hr              |  Student of electrical engineering
hniksic@fly.cc.fer.hr        |  University of Zagreb, Croatia
------------------------------------------------------------------
`VI' - An editor used by those heretics that don't subscribe to
       the Emacs religion.

Re: 8-bit patch for zle_tricky.c

[Hrvoje Niksic]

In your mail, you said:
> It is a security hole, but (a) setuid shell scripts are insecure anyway
> on most systems, and (b) there's a way to avoid it:

As far as I understand, the other problem is with setuid programs calling
other programs with system(), like:
system("/bin/date");
to output date. If the IFS contains '/', someone might have a program named
bin in their path, and then...

-- 
hniksic@srce.hr              |  Student of electrical engineering
hniksic@fly.cc.fer.hr        |  University of Zagreb, Croatia
------------------------------------------------------------------
`VI' - An editor used by those heretics that don't subscribe to
       the Emacs religion.

Re: 8-bit patch for zle_tricky.c

[Zefram]

>As far as I understand, the other problem is with setuid programs calling
>other programs with system(), like:
>system("/bin/date");
>to output date. If the IFS contains '/', someone might have a program named
>bin in their path, and then...

There's a simple solution to that.  Set IFS before using system.  IMO,
setuid programs shouldn't be using system(3), but it is possible to do
it safely.

-zefram

Re: 8-bit patch for zle_tricky.c

[Hrvoje Niksic]

In your mail, you said:
[...]
> There's a simple solution to that.  Set IFS before using system.  IMO,
> setuid programs shouldn't be using system(3), but it is possible to do
> it safely.

Of course. But the point I was trying to make is that not only setuid
scripts, but also setuid C programs calling system (and thus unintentionally
invoking sh) can represent security problems. Which is why IFS is used the
way it is in bash/ksh.

-- 
hniksic@srce.hr              |  Student of electrical engineering
hniksic@fly.cc.fer.hr        |  University of Zagreb, Croatia
------------------------------------------------------------------
`VI' - An editor used by those heretics that don't subscribe to
       the Emacs religion.

Re: 8-bit patch for zle_tricky.c

[Zefram]

>Of course. But the point I was trying to make is that not only setuid
>scripts, but also setuid C programs calling system (and thus unintentionally
>invoking sh) can represent security problems. Which is why IFS is used the
>way it is in bash/ksh.

As I said, it *is* possible for a privileged script to be secure.  IMO
it's up to the person writing such scripts to use the methods
available.  We shouldn't disable a feature just to make this easier.  I
think field splitting should be off by default in zsh, but
SH_WORD_SPLIT or some other option should turn it on.  (Maybe
SH_WORD_SPLIT should do field splitting on words, and SH_FIELD_SPLIT
should do the current filed splitting on parameters.)

In any case, this is not a critical issue, and can wait until after 3.0.

-zefram