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[GH-ISSUE #3466] [Question] About sandbox "X11" #2181

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opened 2026-05-05 08:51:36 -06:00 by gitea-mirror · 7 comments
gitea-mirror commented 2026-05-05 08:51:36 -06:00
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Originally created by @Nokia808 on GitHub (Jun 13, 2020).
Original GitHub issue: https://github.com/netblue30/firejail/issues/3466

Hi dears.

I discover a very powerful feature in Firejail specially useful for Browsers & WineHQ. It is sandbox "X11" server.

I'm on Fedora & available to me "xpra".

I have only one query that confuse me. The needed command is:
$ firejail --x11 --net=eth0 program-and-arguments

My question is about "eth0". Is this always ? Or user need to select it's currently active network interface ?
On my system there is no "eth0" when I run "$ ip link show". This command show me other (one for LAN wire connection, other for WiFi, & 3rd one I do not know but may be for modem & I'm already disabled "ModemManager" & for that it appear to me of UNKNOWN state ...).

Kindly, appreciate that I'm not experience with network connections ...

Originally created by @Nokia808 on GitHub (Jun 13, 2020). Original GitHub issue: https://github.com/netblue30/firejail/issues/3466 Hi dears. I discover a very powerful feature in Firejail specially useful for Browsers & WineHQ. It is sandbox "X11" server. I'm on Fedora & available to me "xpra". I have only one query that confuse me. The needed command is: $ firejail --x11 --net=eth0 program-and-arguments My question is about "eth0". Is this always ? Or user need to select it's currently active network interface ? On my system there is no "eth0" when I run "$ ip link show". This command show me other (one for LAN wire connection, other for WiFi, & 3rd one I do not know but may be for modem & I'm already disabled "ModemManager" & for that it appear to me of UNKNOWN state ...). Kindly, appreciate that I'm not experience with network connections ...
gitea-mirror commented 2026-05-05 08:51:38 -06:00
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@SkewedZeppelin commented on GitHub (Jun 13, 2020):

Your 3rd NIC is probably the bridge for libvirtd enabled by default on Fedora Workstation.

-----Original Message-----
From: Nokia808 notifications@github.com
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Subject: [netblue30/firejail] [Question] About sandbox "X11" (#3466)
Date: Sat, 13 Jun 2020 12:44:14 -0700

Hi dears.

I discover a very powerful feature in Firejail specially useful for Browsers & WineHQ. It is sandbox "X11" server.

I'm on Fedora & available to me "xpra".

I have only one query that confuse me. The needed command is:
$ firejail --x11 --net=eth0 program-and-arguments

My question is about "eth0". Is this always ? Or user need to select it's currently active network interface ?
On my system there is no "eth0" when I run "$ ip link show". This command show me other (one for LAN wire connection, other for WiFi, & 3rd
one I do not know but may be for modem & I'm already disabled "ModemManager" & for that it appear to me of UNKNOWN state ...).

<!-- gh-comment-id:643671240 --> @SkewedZeppelin commented on GitHub (Jun 13, 2020): Your 3rd NIC is probably the bridge for libvirtd enabled by default on Fedora Workstation. -----Original Message----- From: Nokia808 <notifications@github.com> Reply-To: netblue30/firejail <reply@reply.github.com> To: netblue30/firejail <firejail@noreply.github.com> Cc: Subscribed <subscribed@noreply.github.com> Subject: [netblue30/firejail] [Question] About sandbox "X11" (#3466) Date: Sat, 13 Jun 2020 12:44:14 -0700 Hi dears. I discover a very powerful feature in Firejail specially useful for Browsers & WineHQ. It is sandbox "X11" server. I'm on Fedora & available to me "xpra". I have only one query that confuse me. The needed command is: $ firejail --x11 --net=eth0 program-and-arguments My question is about "eth0". Is this always ? Or user need to select it's currently active network interface ? On my system there is no "eth0" when I run "$ ip link show". This command show me other (one for LAN wire connection, other for WiFi, & 3rd one I do not know but may be for modem & I'm already disabled "ModemManager" & for that it appear to me of UNKNOWN state ...).
gitea-mirror commented 2026-05-05 08:51:39 -06:00
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@Nokia808 commented on GitHub (Jun 13, 2020):

@SkewedZeppelin
I did not understood ! What I have to type, "eth0" or other thing ?

The output of "ip link show" on my system is:

$ ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
2: enp0s25: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
    link/ether xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
3: wlp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000
    link/ether xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

I delete the addresses & replaced them by xxxxxxxx because I do not know if they have a security impact if become public ...

<!-- gh-comment-id:643674145 --> @Nokia808 commented on GitHub (Jun 13, 2020): @SkewedZeppelin I did not understood ! What I have to type, "eth0" or other thing ? The output of "ip link show" on my system is: ``` $ ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 2: enp0s25: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000 link/ether xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 3: wlp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000 link/ether xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ``` I delete the addresses & replaced them by xxxxxxxx because I do not know if they have a security impact if become public ...
gitea-mirror commented 2026-05-05 08:51:40 -06:00
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@Nokia808 commented on GitHub (Jun 14, 2020):

Note: I'm not on Fedora Workstation, but I'm on Fedora X64 bit Cinnamon edition.

I'm afraid now that this issue will converted from a "Question" into incompatibility issue with recent features of Fedora ...

<!-- gh-comment-id:643723229 --> @Nokia808 commented on GitHub (Jun 14, 2020): Note: I'm not on Fedora Workstation, but I'm on Fedora X64 bit Cinnamon edition. I'm afraid now that this issue will converted from a "Question" into incompatibility issue with recent features of Fedora ...
gitea-mirror commented 2026-05-05 08:51:41 -06:00
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@rusty-snake commented on GitHub (Jun 14, 2020):

Use --net=enp0s25 or --net=wlp4s0 depending on your connection.

<!-- gh-comment-id:643735918 --> @rusty-snake commented on GitHub (Jun 14, 2020): Use `--net=enp0s25` or `--net=wlp4s0` depending on your connection.
gitea-mirror commented 2026-05-05 08:51:42 -06:00
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@Nokia808 commented on GitHub (Jun 14, 2020):

@rusty-snake
This mean I should use:
firejail --x11 --net=wlp4s0 firefox
as long I'm using WiFi connection to connect to Internet. Issue fixed.

But please document this. I suggest on you to add the following: "the parameter that should used with --net= should be your ACTIVE network connection, that you using to connect to Internet. You can use ip link show to display your network interfaces & their states". Adding such explanation to your documentation on your site is useful.

Before closing this issue I need to know about the following:

  1. I concluded from the above that sandbox X11 should done only for those applications that connect or can connect to Internet. Is this true ?
  2. can I use sandbox of X11 while I'm disconnected from Internet, for example, while using Firefox to open a saved web page off-line ?
<!-- gh-comment-id:643742567 --> @Nokia808 commented on GitHub (Jun 14, 2020): @rusty-snake This mean I should use: firejail --x11 --net=wlp4s0 firefox as long I'm using WiFi connection to connect to Internet. Issue fixed. But please document this. I suggest on you to add the following: "the parameter that should used with --net= should be your ACTIVE network connection, that you using to connect to Internet. You can use ip link show to display your network interfaces & their states". Adding such explanation to your documentation on your site is useful. Before closing this issue I need to know about the following: 1) I concluded from the above that sandbox X11 should done only for those applications that connect or can connect to Internet. Is this true ? 2) can I use sandbox of X11 while I'm disconnected from Internet, for example, while using Firefox to open a saved web page off-line ?
gitea-mirror commented 2026-05-05 08:51:43 -06:00
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@rusty-snake commented on GitHub (Jun 14, 2020):

I concluded from the above that sandbox X11 should done only for those applications that connect or can connect to Internet. Is this true ?

No, you can/should sandbox everything you want. Programs with internet access have a higher attack surface, so you should first focus on them while hardening you system.

can I use sandbox of X11 while I'm disconnected from Internet, for example, while using Firefox to open a saved web page off-line ?

Sure, it is completely unrelated. However, if you connect later to the internet, you must restart the sandbox to have network access.

<!-- gh-comment-id:643759856 --> @rusty-snake commented on GitHub (Jun 14, 2020): > I concluded from the above that sandbox X11 should done only for those applications that connect or can connect to Internet. Is this true ? No, you can/should sandbox everything you want. Programs with internet access have a higher attack surface, so you should first focus on them while hardening you system. > can I use sandbox of X11 while I'm disconnected from Internet, for example, while using Firefox to open a saved web page off-line ? Sure, it is completely unrelated. However, if you connect later to the internet, you must restart the sandbox to have network access.
gitea-mirror commented 2026-05-05 08:51:44 -06:00
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@Nokia808 commented on GitHub (Jun 14, 2020):

Thank you, though - because I'm not technician I can not understand how it utilizing network interface that used to connect to Internet, & being unrelated whether it is active or not !

Kindly, to add your statement "if you connect later to the internet, you must restart the sandbox to have network access." to site documentation with what I suggested to add before.

<!-- gh-comment-id:643762104 --> @Nokia808 commented on GitHub (Jun 14, 2020): Thank you, though - because I'm not technician I can not understand how it utilizing network interface that used to connect to Internet, & being unrelated whether it is active or not ! Kindly, to add your statement "if you connect later to the internet, you must restart the sandbox to have network access." to site documentation with what I suggested to add before.
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