Re: Group Permissions on root folders problem (Windows 10 TP build 10061)

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

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On Sep 11 21:33, Takashi Yano wrote:
> Hi Corinna,
> 
> On Fri, 11 Sep 2015 13:10:12 +0200
> Corinna Vinschen wrote:
> > In theory, yes.  The problem is just that checking the uid/gid equality
> > is not safe, given that you can easily create that via passwd/group
> > files.  What I was thinking of is to convert the uid/gid values into
> > SIDs using the `getent' tool and to compare those, along the lines of
> > 
> >   uid=$(/usr/bin/stat -c '%u')
> >   user_sid=$(getent passwd -w $uid | awk -F: '{print $4}')
> >   gid=$(/usr/bin/stat -c '%g')
> >   grp_sid=$(getent group -w $gid | awk -F: '{print $4}')
> >   if [ "${user_sid}" = "${grp_sid}" ]
> >     ...
> > 
> > Can you check if that works in your env and perhaps create a new patch
> > using the SIDs?
> 
> I have made a new patch and confirmed that it also works.
> 
> 
> --- cygwin-service-installation-helper.sh.orig	2015-02-24 04:57:56.000000000 +0900
> +++ cygwin-service-installation-helper.sh	2015-09-11 21:30:08.539361900 +0900
> @@ -2442,6 +2442,12 @@
>  # ======================================================================
>  _csih_setup()
>  {
> +  local uid
> +  local gid
> +  local user_sid
> +  local grp_sid
> +  local perms="d..x..x..[xt]"
> +
>    csih_stacktrace "${@}"
>    $_csih_trace
>    if [ "$_csih_setup_already_called" -eq 0 ]
> @@ -2462,7 +2468,17 @@
>        csih_error "Problem with LocalSystem or Adminstrator IDs"
>      fi
>  
> -    if ! csih_check_dir_perms "${LOCALSTATEDIR}" "d..x..x..[xt]"
> +    uid=$(/usr/bin/stat -c '%u' ${LOCALSTATEDIR})
> +    gid=$(/usr/bin/stat -c '%g' ${LOCALSTATEDIR})
> +    user_sid=$(/usr/bin/getent -w passwd $uid | awk -F: '{print $4}')
> +    grp_sid=$(/usr/bin/getent -w group $gid | awk -F: '{print $4}')
> +
> +    if [ "${user_sid}" = "${grp_sid}" ]
> +    then
> +      perms="d..x.....[xt]"
> +    fi
> +
> +    if ! csih_check_dir_perms "${LOCALSTATEDIR}" "${perms}"
>      then
>        csih_error "Problem with ${LOCALSTATEDIR} directory. Exiting."
>      fi

Thank you, patch applied.


Heading into vacation now.


Have fun,
Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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