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Subject: bug#40550: zsh: sudo is not setuid
Resent-From: "Alexandru-Sergiu Marton" <brown121407@HIDDEN>
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Date: Sat, 11 Apr 2020 13:10:17 +0300
From: "Alexandru-Sergiu Marton" <brown121407@HIDDEN>
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Hi,

I changed my default shell to zsh with the following line added to
my user-account record in my config.scm:

(shell #~(string-append #$zsh "/bin/zsh"))

After reconfiguring the system and rebooting, when I try to run sudo or
su (I guess this problem appears for every thing in %setuid-programs), I
get a message saying it isn't actually a setuid program.

I'm writing this from a reconfigured system started at the same point as
the zsh one started, but with bash. Here I don't have that problem --
setuid programs work as expected.

Steps to reproduce:
- $ guix pull
- Change the default shell to zsh in your config.scm, as presented
  above.
- $ sudo guix system reconfigure config.scm
- Reboot.
- Try to run sudo or su. It should give you an error.

Cheers,
Sergiu

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To: Alexandru-Sergiu Marton <brown121407@HIDDEN>
Subject: bug#40550: Acknowledgement (zsh: sudo is not setuid)
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Subject: bug#40550: zsh: sudo is not setuid
Resent-From: Efraim Flashner <efraim@HIDDEN>
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To: Alexandru-Sergiu Marton <brown121407@HIDDEN>
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Date: Sat, 11 Apr 2020 22:38:21 +0300
From: Efraim Flashner <efraim@HIDDEN>
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On Sat, Apr 11, 2020 at 01:10:17PM +0300, Alexandru-Sergiu Marton wrote:
> Hi,
>=20
> I changed my default shell to zsh with the following line added to
> my user-account record in my config.scm:
>=20
> (shell #~(string-append #$zsh "/bin/zsh"))
>=20
> After reconfiguring the system and rebooting, when I try to run sudo or
> su (I guess this problem appears for every thing in %setuid-programs), I
> get a message saying it isn't actually a setuid program.
>=20
> I'm writing this from a reconfigured system started at the same point as
> the zsh one started, but with bash. Here I don't have that problem --
> setuid programs work as expected.
>=20
> Steps to reproduce:
> - $ guix pull
> - Change the default shell to zsh in your config.scm, as presented
>   above.
> - $ sudo guix system reconfigure config.scm
> - Reboot.
> - Try to run sudo or su. It should give you an error.

Do you have sudo installed in a profile? /run/setuid-programs/sudo
should be the first 'sudo' in your PATH regardless of the shell. What's
the contents of your $PATH?

(ins)efraim@E5400 ~$ which -a sudo
/run/setuid-programs/sudo
/run/current-system/profile/bin/sudo
(ins)efraim@E5400 ~$ guix environment --ad-hoc zsh
substitute: updating substitutes from 'http://192.168.1.183:3000'... 100.0%
substitute: updating substitutes from 'http://192.168.1.217:3000'... 100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bayfront.guix.gnu.org'... 10=
0.0%
The following derivation will be built:
   /gnu/store/yfqfk66vl1s6av45a92ml5l60d2kaxyk-profile.drv
2.1 MB will be downloaded:
   /gnu/store/icyx0ynnaaradzzxfqyjrwy0x545zdn5-zsh-5.8
The following profile hooks will be built:
   /gnu/store/8kim2ay78nrlgpdks734hridk21waxhc-fonts-dir.drv
   /gnu/store/fxdkr919viih72p9s2zkiadgj7r182d1-info-dir.drv
   /gnu/store/ml3s254v7zf4dmwmfpc59clr0xgllsbn-ca-certificate-bundle.drv
   /gnu/store/rvd1xybadpnzwlm1qz7iqcsky1dj2myw-manual-database.drv
downloading from https://ci.guix.gnu.org/nar/lzip/icyx0ynnaaradzzxfqyjrwy0x=
545zdn5-zsh-5.8...
 zsh-5.8  2.0MiB                                            1.6MiB/s 00:01 =
[##################] 100.0%

building CA certificate bundle...
building fonts directory...
building directory of Info manuals...
building database for manual pages...
building profile with 1 package...
(ins)efraim@E5400 ~ [env]$ zsh
E5400% which -a sudo
/run/setuid-programs/sudo
/run/current-system/profile/bin/sudo

--=20
Efraim Flashner   <efraim@HIDDEN>   =D7=90=D7=A4=D7=A8=D7=99=D7=9D =
=D7=A4=D7=9C=D7=A9=D7=A0=D7=A8
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Message sent to bug-guix@HIDDEN:

Subject: bug#40550: zsh: sudo is not setuid
References: <C1YAP1W11L61.2VVVOWHR0N902@121408>
Resent-From: "Alexandru-Sergiu Marton" <brown121407@HIDDEN>
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Date: Mon, 13 Apr 2020 07:46:58 +0300
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From: "Alexandru-Sergiu Marton" <brown121407@HIDDEN>
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On Sun Apr 12, 2020 at 1:38 AM PST, Efraim Flashner wrote:
> Do you have sudo installed in a profile? /run/setuid-programs/sudo
> should be the first 'sudo' in your PATH regardless of the shell. What's
> the contents of your $PATH?

This is my $PATH in zsh:
/home/brown/bin:/home/brown/.local/bin:/home/brown/.guix-profile/bin:/home/=
brown/.guix-profile/sbin:/run/current-system/profile/bin

> (ins)efraim@E5400 ~$ which -a sudo
> /run/setuid-programs/sudo
> /run/current-system/profile/bin/sudo

$ which -a sudo
/run/current-system/profile/bin/sudo

BUT!

$ ls /run/setuid-programs/
dbus-daemon-launch-helper  newuidmap  pkexec                 sudoedit
fusermount                 passwd     polkit-agent-helper-1  umount
mount                      ping       su
newgidmap                  ping6      sudo

So it looks like it's a problem with my PATH. While in bash I don't
append /run/setuid-programs to it manually, yet bash recognizes the
setuid programs. I'll probably add /run/setuid-programs by hand but I'm
wondering why doesn't it work by default.

Thanks,
Sergiu

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Just a few more details. If I boot into a system config with bash as the
default shell, this is my $PATH:

/home/brown/.guix-profile/bin:/home/brown/.guix-profile/sbin:/home/brown/bi=
n:/home/brown/.local/bin:/home/brown/.guix-profile/bin:/home/brown/.guix-pr=
ofile/sbin:/run/setuid-programs:/home/brown/.config/guix/current/bin:/home/=
brown/.guix-profile/bin:/home/brown/.guix-profile/sbin:/run/current-system/=
profile/bin:/run/current-system/profile/sbin

If I get zsh through an environment, my PATH still has
/run/setuid-programs in it.

[brown@121408 ~]$ guix environment --ad-hoc zsh
[brown@121408 ~][env]$ zsh
[brown@121408 ~]$ echo $PATH
/home/brown/.guix-profile/bin:/home/brown/.guix-profile/sbin:/gnu/store/anb=
9bk6qbwhblfr6fqcv6iiq8scyng1i-profile/bin:/home/brown/.guix-profile/bin:/ho=
me/brown/.guix-profile/sbin:/home/brown/bin:/home/brown/.local/bin:/home/br=
own/.guix-profile/bin:/home/brown/.guix-profile/sbin:/run/setuid-programs:/=
home/brown/.config/guix/current/bin:/home/brown/.guix-profile/bin:/home/bro=
wn/.guix-profile/sbin:/run/current-system/profile/bin:/run/current-system/p=
rofile/sbin
[brown@121408 ~]$ which -a sudo
/run/setuid-programs/sudo
/run/current-system/profile/bin/sudo

So my problem happens only when setting zsh as an account's default
shell.

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From: Leo Famulari <leo@HIDDEN>
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On Mon, Apr 13, 2020 at 07:46:58AM +0300, Alexandru-Sergiu Marton wrote:
> On Sun Apr 12, 2020 at 1:38 AM PST, Efraim Flashner wrote:
> > Do you have sudo installed in a profile? /run/setuid-programs/sudo
> > should be the first 'sudo' in your PATH regardless of the shell. What's
> > the contents of your $PATH?
> 
> This is my $PATH in zsh:
> /home/brown/bin:/home/brown/.local/bin:/home/brown/.guix-profile/bin:/home/brown/.guix-profile/sbin:/run/current-system/profile/bin

Setting up Zsh should definitely work when creating a new user's home
directory, but maybe it doesn't do the right thing when changing a
user's shell after the home directory has already been created. We
should look into that.

Please copy the contents of '/etc/skel/.zprofile' to your zprofile file
and check for the /run/setuid-programs in your $PATH after logging in
again with `zsh --login`.

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retitle 40550 "Shell skeletons not working as expected"

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retitle 40550 Shell skeletons not working as expected

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