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Re: ssh-host-config eval password bug
- From: Christopher Faylor <cgf-use-the-mailinglist-please at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Sun, 5 Jul 2009 18:53:27 -0400
- Subject: Re: ssh-host-config eval password bug
- References: <4A50EBA3.9090000@gmail.com> <4A51200A.8090207@byu.net>
- Reply-to: cygwin at cygwin dot com
On Sun, Jul 05, 2009 at 03:50:02PM -0600, Eric Blake wrote:
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>According to Ian Kelling on 7/5/2009 12:06 PM:
>> In the ssh package there is a bug in /usr/bin/ssh-host-config where if
>> you select a valid password spaces or punctuation that bash knows of, it
>> will fail and you could possibly shoot yourself in the foot due to
>> evaling your password. I don't know who is responsible, or what mailing
>> list to post on, but here is a patch.
>
>This is the right list.
>
>> - cygwin_env="-e CYGWIN=\"${csih_cygenv}\""
>> + cygwin_env=( -e "CYGWIN=${csih_cygenv}" )
>
>I don't see why you need an array variable.
>
>> fi
>> if [ -z "${password}" ]
>> then
>> - if eval cygrunsrv -I sshd -d \"CYGWIN sshd\" -p /usr/sbin/sshd \
>> - -a "-D" -y tcpip ${cygwin_env}
>> + if cygrunsrv -I sshd -d "CYGWIN sshd" -p /usr/sbin/sshd \
>> + -a "-D" -y tcpip "${cygwin_env[@]}"
>
>The eval is still reasonable, but with proper quoting:
>
>if eval cygrunsrv ... -y tcpip "${cygwin_env}"
How is eval better than an array environment variable? The above use of
"${cygwin_env[@]}" seems to do exactly what you'd want without worrying
about the additional gotchas from an eval.
cgf
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