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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. 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. 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. Proceed at your own risk.
Do not rely on this for extra security.** 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 Dom0 passwordless root access
----------------------------- -----------------------------