From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Group Permissions on root folders problem (Windows 10 TP build 10061)
Date: Fri, 11 Sep 2015 11:10:00 -0000 [thread overview]
Message-ID: <20150911111012.GF26699@calimero.vinschen.de> (raw)
In-Reply-To: <20150911190414.e77404dc09587954644ab65d@nifty.ne.jp>
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Hi Takashi,
On Sep 11 19:04, Takashi Yano wrote:
> Hi Corinna,
>
> Regarding the first problem:
> > > a) Group permissions on root folders
>
> On Sun, 6 Sep 2015 13:44:44 +0200
> Corinna Vinschen wrote:
> > The group permission problem is easy (and I'm wondering if it really was
> > such a bright idea to let user SID == group SID slip through in Cygwin,
> > rather tnan sticking to the former idea to change the group SID to
> > "Users" in this case). csih needs a patch to not check for the group
> > x bit if user SID == group SID.
>
> Do you intend a patch like this? I have confirmed that sshd
> is successfully installed and works nicely with this patch
> under a Microsoft Account.
>
> --- cygwin-service-installation-helper.sh.orig 2015-02-24 04:57:56.000000000 +0900
> +++ cygwin-service-installation-helper.sh 2015-09-11 18:41:56.870882800 +0900
> @@ -2442,6 +2442,8 @@
> # ======================================================================
> _csih_setup()
> {
> + local perms="d..x..x..[xt]"
> +
> csih_stacktrace "${@}"
> $_csih_trace
> if [ "$_csih_setup_already_called" -eq 0 ]
> @@ -2462,7 +2464,13 @@
> csih_error "Problem with LocalSystem or Adminstrator IDs"
> fi
>
> - if ! csih_check_dir_perms "${LOCALSTATEDIR}" "d..x..x..[xt]"
> + if [ `/usr/bin/stat -c '%g' ${LOCALSTATEDIR}` -eq \
> + `/usr/bin/stat -c '%u' ${LOCALSTATEDIR}` ]
> + then
> + perms="d..x.....[xt]"
> + fi
> +
> + if ! csih_check_dir_perms "${LOCALSTATEDIR}" "${perms}"
> then
> csih_error "Problem with ${LOCALSTATEDIR} directory. Exiting."
> fi
In theory, yes. The problem is just that checking the uid/gid equality
is not safe, given that you can easily create that via passwd/group
files. What I was thinking of is to convert the uid/gid values into
SIDs using the `getent' tool and to compare those, along the lines of
uid=$(/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?
Thanks a lot,
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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next prev parent reply other threads:[~2015-09-11 11:10 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAMH9mcFEL3mao+m-DEYM84kC1HOPeSBpZXD+mDf0USobF9oY7g@mail.gmail.com>
2015-06-16 13:23 ` Brian Buchanan
2015-06-16 15:58 ` Corinna Vinschen
2015-09-05 6:59 ` Takashi Yano
2015-09-06 11:44 ` Corinna Vinschen
2015-09-10 11:05 ` Takashi Yano
2015-09-10 17:23 ` Corinna Vinschen
2015-09-10 17:27 ` Eric Blake
2015-09-10 17:31 ` Corinna Vinschen
2015-09-10 17:36 ` Eric Blake
2015-09-10 17:49 ` Corinna Vinschen
2015-09-11 0:50 ` Andrey Repin
2015-09-11 1:24 ` Eric Blake
2015-09-11 2:05 ` Andrey Repin
2015-09-11 10:04 ` Takashi Yano
2015-09-11 11:10 ` Corinna Vinschen [this message]
2015-09-11 12:33 ` Takashi Yano
2015-09-11 15:18 ` Corinna Vinschen
[not found] ` <DJzl1r0012qVqVd01Jzm3c>
2015-09-10 15:49 ` David A Cobb
2015-09-10 16:07 ` Ken Brown
2015-09-10 17:29 ` Corinna Vinschen
[not found] ` <FU891r01R2qVqVd01U8Bkq>
2015-09-10 20:41 ` David A Cobb
2015-04-29 14:45 Brian Buchanan
2015-04-30 8:24 ` Corinna Vinschen
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