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Merge branch 'pr-1330' - Update vm-sudo

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unman 2023-10-29 15:15:03 +00:00
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user/security-in-qubes/vm-sudo.md
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@ -105,83 +105,11 @@ Replacing passwordless root access with Dom0 user prompt
While the Qubes developers support the statement above, some Qubes users may wish to enable user/root isolation in VMs anyway.
We do not support it in any of our packages, but of course nothing is preventing the user from modifying his or her own system.
A list of steps to do so is provided here **without any guarantee of safety, accuracy, or completeness.
A list of steps to do so is provided at [Qubes community, Replacing passwordless root with a dom0 prompt
](https://github.com/Qubes-Community/Contents/blob/master/docs/security/replacing-passwordless-root-with-dom0-prompt.md) **without any guarantee of safety, accuracy, or completeness.
Proceed at your own risk.
Do not rely on this for extra security.**
1. Adding Dom0 "VMAuth" service:
```
[root@dom0 /]# echo "/usr/bin/echo 1" >/etc/qubes-rpc/qubes.VMAuth
[root@dom0 /]# echo "@anyvm dom0 ask,default_target=dom0" \
>/etc/qubes-rpc/policy/qubes.VMAuth
[root@dom0 /]# chmod +x /etc/qubes-rpc/qubes.VMAuth
```
(Note: any VMs you would like still to have passwordless root access (e.g. Templates) can be specified in the second file with "\<vmname\> dom0 allow")
2. Configuring Fedora template to prompt Dom0 for any authorization request:
- In `/etc/pam.d/system-auth`, replace all lines beginning with "auth" with these lines:
```
auth [success=1 default=ignore] pam_exec.so seteuid /usr/lib/qubes/qrexec-client-vm dom0 qubes.VMAuth /bin/grep -q ^1$
auth requisite pam_deny.so
auth required pam_permit.so
```
- Require authentication for sudo.
Replace the first line of `/etc/sudoers.d/qubes` with:
```
user ALL=(ALL) ALL
```
- Disable PolKit's default-allow behavior:
```
[root@fedora-20-x64]# rm /etc/polkit-1/rules.d/00-qubes-allow-all.rules
[root@fedora-20-x64]# rm /etc/polkit-1/localauthority/50-local.d/qubes-allow-all.pkla
```
3. Configuring Debian/Whonix template to prompt Dom0 for any authorization request:
- In `/etc/pam.d/common-auth`, replace all lines beginning with "auth" with these lines:
```
auth [success=1 default=ignore] pam_exec.so seteuid /usr/lib/qubes/qrexec-client-vm dom0 qubes.VMAuth /bin/grep -q ^1$
auth requisite pam_deny.so
auth required pam_permit.so
```
- Require authentication for sudo.
Replace the first line of `/etc/sudoers.d/qubes` with:
```
user ALL=(ALL) ALL
```
- Disable PolKit's default-allow behavior:
```
[root@debian-8]# rm /etc/polkit-1/rules.d/00-qubes-allow-all.rules
[root@debian-8]# rm /etc/polkit-1/localauthority/50-local.d/qubes-allow-all.pkla
```
- In `/etc/pam.d/su.qubes`, comment out this line near the bottom of the file:
```
auth sufficient pam_permit.so
```
- For Whonix, if prompts appear during boot, create `/etc/sudoers.d/zz99` and add these lines:
```
ALL ALL=NOPASSWD: /usr/sbin/virt-what
ALL ALL=NOPASSWD: /usr/sbin/service whonixcheck restart
ALL ALL=NOPASSWD: /usr/sbin/service whonixcheck start
ALL ALL=NOPASSWD: /usr/sbin/service whonixcheck stop
ALL ALL=NOPASSWD: /usr/sbin/service whonixcheck status
```
Dom0 passwordless root access
-----------------------------