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[GH-ISSUE #3605] DNS requests fail in jailed Firefox with IPv6 resolver #2261

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opened 2026-05-05 08:57:10 -06:00 by gitea-mirror · 16 comments
gitea-mirror commented 2026-05-05 08:57:10 -06:00
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Originally created by @In-line on GitHub (Aug 28, 2020).
Original GitHub issue: https://github.com/netblue30/firejail/issues/3605

When using system /etc/resolv.conf

nameserver ::1
nameserver 127.0.0.1

DNS requests fail in Firefox. Commenting nameserver ::1 solves issue.

This doesn't happen in non-jailed firefox and using dig in Firefox joined (--join=) sandbox.

IPv6 is disabled in Linux commandline ipv6.disable=1, didn't test with enabled IPv6.
Resolver in 127.0.0.1 is dnscrypt-proxy.

Firejail 0.9.62.4
Mozilla Firefox 79.0
DNSCrypt Proxy 2.0.44
Distribution: Arch Linux

Originally created by @In-line on GitHub (Aug 28, 2020). Original GitHub issue: https://github.com/netblue30/firejail/issues/3605 When using system `/etc/resolv.conf` ``` nameserver ::1 nameserver 127.0.0.1 ``` DNS requests fail in Firefox. Commenting `nameserver ::1` solves issue. This doesn't happen in non-jailed firefox and using `dig` in Firefox joined (`--join=`) sandbox. IPv6 is disabled in Linux commandline `ipv6.disable=1`, didn't test with enabled IPv6. Resolver in `127.0.0.1` is dnscrypt-proxy. Firejail 0.9.62.4 Mozilla Firefox 79.0 DNSCrypt Proxy 2.0.44 Distribution: Arch Linux
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gitea-mirror commented 2026-05-05 08:57:12 -06:00
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@In-line commented on GitHub (Aug 28, 2020):

Seems to be the same issue https://www.reddit.com/r/archlinux/comments/5uh2y5/firejail_doesnt_use_archs_default_dns_server_need/

<!-- gh-comment-id:682438569 --> @In-line commented on GitHub (Aug 28, 2020): Seems to be the same issue https://www.reddit.com/r/archlinux/comments/5uh2y5/firejail_doesnt_use_archs_default_dns_server_need/
gitea-mirror commented 2026-05-05 08:57:13 -06:00
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@bbhtt commented on GitHub (Aug 30, 2020):

This does not happen for me, I'm using nm-manager+systemd-resolved on Arch: /etc/resolv.conf -> /run/systemd/resolve/resolv.conf

<!-- gh-comment-id:683368198 --> @bbhtt commented on GitHub (Aug 30, 2020): This does not happen for me, I'm using nm-manager+systemd-resolved on Arch: `/etc/resolv.conf -> /run/systemd/resolve/resolv.conf`
gitea-mirror commented 2026-05-05 08:57:14 -06:00
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@rusty-snake commented on GitHub (Oct 1, 2020):

Any progress here?

<!-- gh-comment-id:702306665 --> @rusty-snake commented on GitHub (Oct 1, 2020): Any progress here?
gitea-mirror commented 2026-05-05 08:57:15 -06:00
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@sak96 commented on GitHub (Feb 7, 2022):

looks like something is wrong with dns via sytemd-resolved in firefox profile.

firejail --version
firejail version 0.9.68

Compile time support:
        - always force nonewprivs support is disabled
        - AppArmor support is enabled
        - AppImage support is enabled
        - chroot support is enabled
        - D-BUS proxy support is enabled
        - file transfer support is enabled
        - firetunnel support is enabled
        - networking support is enabled
        - output logging is enabled
        - overlayfs support is disabled
        - private-home support is enabled
        - private-cache and tmpfs as user enabled
        - SELinux support is disabled
        - user namespace support is enabled
        - X11 sandboxing support is enabled

$ firejail --trace --profile=firefox  getent hosts google.com
...
8:getent:connect 4 /run/systemd/resolve/io.systemd.Resolve:-1
...

..snipped to tracelog
8:getent:exec /usr/bin/getent:0
8:getent:fopen64 /run/systemd/machines/google.com:(nil)
8:getent:socket AF_LOCAL SOCK_STREAM 0:4
8:getent:connect 4 /run/systemd/resolve/io.systemd.Resolve:-1
8:getent:socket AF_INET SOCK_DGRAM IPPROTO_IP:4
8:getent:connect 4 127.0.0.1 port 53:0
8:getent:socket AF_INET SOCK_DGRAM IPPROTO_IP:4
8:getent:connect 4 127.0.0.1 port 53:0
8:getent:fopen64 /run/systemd/machines/google.com:(nil)
8:getent:socket AF_LOCAL SOCK_STREAM 0:4
8:getent:connect 4 /run/systemd/resolve/io.systemd.Resolve:-1
8:getent:socket AF_INET SOCK_DGRAM IPPROTO_IP:4
8:getent:connect 4 127.0.0.1 port 53:0
8:getent:socket AF_INET SOCK_DGRAM IPPROTO_IP:4
8:getent:connect 4 127.0.0.1 port 53:0

$ firejail --trace --noprofile  getent hosts google.com
...
2:getent:connect 5 /run/systemd/resolve/io.systemd.Resolve:0
...

..snipped to tracelog
2:zsh:exec /usr/bin/zsh:0
2:zsh:open /dev/pts/3:4
2:zsh:open /etc/zsh/zshenv:-1
2:zsh:open /home/sak/.zshenv:-1
2:zsh:open /dev/null:4
2:zsh:access /usr/local/bin/getent:-1
2:zsh:access /usr/bin/getent:0
2:getent:exec /usr/bin/getent:0
2:getent:fopen64 /run/systemd/machines/google.com:(nil)
2:getent:socket AF_LOCAL SOCK_STREAM 0:5
2:getent:connect 5 /run/systemd/resolve/io.systemd.Resolve:0
2404:6800:4009:80f::200e google.com
<!-- gh-comment-id:1031550960 --> @sak96 commented on GitHub (Feb 7, 2022): looks like something is wrong with dns via sytemd-resolved in firefox profile. <summary> ```bash firejail --version firejail version 0.9.68 ``` <details> ``` Compile time support: - always force nonewprivs support is disabled - AppArmor support is enabled - AppImage support is enabled - chroot support is enabled - D-BUS proxy support is enabled - file transfer support is enabled - firetunnel support is enabled - networking support is enabled - output logging is enabled - overlayfs support is disabled - private-home support is enabled - private-cache and tmpfs as user enabled - SELinux support is disabled - user namespace support is enabled - X11 sandboxing support is enabled ``` </details> </summary> <summary> ```bash $ firejail --trace --profile=firefox getent hosts google.com ... 8:getent:connect 4 /run/systemd/resolve/io.systemd.Resolve:-1 ... ``` <details> ``` ..snipped to tracelog 8:getent:exec /usr/bin/getent:0 8:getent:fopen64 /run/systemd/machines/google.com:(nil) 8:getent:socket AF_LOCAL SOCK_STREAM 0:4 8:getent:connect 4 /run/systemd/resolve/io.systemd.Resolve:-1 8:getent:socket AF_INET SOCK_DGRAM IPPROTO_IP:4 8:getent:connect 4 127.0.0.1 port 53:0 8:getent:socket AF_INET SOCK_DGRAM IPPROTO_IP:4 8:getent:connect 4 127.0.0.1 port 53:0 8:getent:fopen64 /run/systemd/machines/google.com:(nil) 8:getent:socket AF_LOCAL SOCK_STREAM 0:4 8:getent:connect 4 /run/systemd/resolve/io.systemd.Resolve:-1 8:getent:socket AF_INET SOCK_DGRAM IPPROTO_IP:4 8:getent:connect 4 127.0.0.1 port 53:0 8:getent:socket AF_INET SOCK_DGRAM IPPROTO_IP:4 8:getent:connect 4 127.0.0.1 port 53:0 ``` </details> </summary> <summary> ```bash $ firejail --trace --noprofile getent hosts google.com ... 2:getent:connect 5 /run/systemd/resolve/io.systemd.Resolve:0 ... ``` <details> ``` ..snipped to tracelog 2:zsh:exec /usr/bin/zsh:0 2:zsh:open /dev/pts/3:4 2:zsh:open /etc/zsh/zshenv:-1 2:zsh:open /home/sak/.zshenv:-1 2:zsh:open /dev/null:4 2:zsh:access /usr/local/bin/getent:-1 2:zsh:access /usr/bin/getent:0 2:getent:exec /usr/bin/getent:0 2:getent:fopen64 /run/systemd/machines/google.com:(nil) 2:getent:socket AF_LOCAL SOCK_STREAM 0:5 2:getent:connect 5 /run/systemd/resolve/io.systemd.Resolve:0 2404:6800:4009:80f::200e google.com ``` </details> </summary>
gitea-mirror commented 2026-05-05 08:57:16 -06:00
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@sak96 commented on GitHub (Feb 7, 2022):

any know fixes @rusty-snake

<!-- gh-comment-id:1031551368 --> @sak96 commented on GitHub (Feb 7, 2022): any know fixes @rusty-snake
gitea-mirror commented 2026-05-05 08:57:17 -06:00
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@rusty-snake commented on GitHub (Feb 7, 2022):

Does

  1. firejail --noprofile /usr/bin/firefox
  2. firejail --ignore=whitelist /usr/bin/firefox
  3. firejail --ignore=whitelist --ignore=blacklist /usr/bin/firefox
  4. firejail --ignore=dbus-user --ignore=dbus-system /usr/bin/firefox
    work?
<!-- gh-comment-id:1031579755 --> @rusty-snake commented on GitHub (Feb 7, 2022): Does 1. `firejail --noprofile /usr/bin/firefox` 2. `firejail --ignore=whitelist /usr/bin/firefox` 3. `firejail --ignore=whitelist --ignore=blacklist /usr/bin/firefox` 4. `firejail --ignore=dbus-user --ignore=dbus-system /usr/bin/firefox` work?
gitea-mirror commented 2026-05-05 08:57:17 -06:00
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@sak96 commented on GitHub (Feb 7, 2022):

  • firejail --noprofile /usr/bin/firefox
  • firejail --ignore=whitelist /usr/bin/firefox
  • firejail --ignore=whitelist --ignore=blacklist /usr/bin/firefox
  • firejail --ignore=dbus-user --ignore=dbus-system /usr/bin/firefox

dns works with all of them.

<!-- gh-comment-id:1031686100 --> @sak96 commented on GitHub (Feb 7, 2022): - [x] firejail --noprofile /usr/bin/firefox - [x] firejail --ignore=whitelist /usr/bin/firefox - [x] firejail --ignore=whitelist --ignore=blacklist /usr/bin/firefox - [x] firejail --ignore=dbus-user --ignore=dbus-system /usr/bin/firefox dns works with all of them.
gitea-mirror commented 2026-05-05 08:57:18 -06:00
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@rusty-snake commented on GitHub (Feb 7, 2022):

  • firejail --ignore=dbus-system /usr/bin/firefox
  • firejail --ignore="dbus-system none" --dbus-system=filter --dbus-system.talk=org.freedesktop.resolve1 /usr/bin/firefox
  • firejail --ignore="include whitelist-run-common.inc" /usr/bin/firefox
  • firejail --whitelist=/run/systemd /usr/bin/firefox
  • firejail --whitelist=/run/systemd/resolve /usr/bin/firefox
  • firejail --whitelist=/run/systemd/resolve/io.systemd.Resolve /usr/bin/firefox
<!-- gh-comment-id:1031691799 --> @rusty-snake commented on GitHub (Feb 7, 2022): - `firejail --ignore=dbus-system /usr/bin/firefox` - `firejail --ignore="dbus-system none" --dbus-system=filter --dbus-system.talk=org.freedesktop.resolve1 /usr/bin/firefox` - `firejail --ignore="include whitelist-run-common.inc" /usr/bin/firefox` - `firejail --whitelist=/run/systemd /usr/bin/firefox` - `firejail --whitelist=/run/systemd/resolve /usr/bin/firefox` - `firejail --whitelist=/run/systemd/resolve/io.systemd.Resolve /usr/bin/firefox`
gitea-mirror commented 2026-05-05 08:57:19 -06:00
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@rusty-snake commented on GitHub (Feb 7, 2022):

  1. Why not ignore include …?
  2. Does whitelist /run/systemd/… work?
  3. Does the D-Bus way work?
<!-- gh-comment-id:1031704568 --> @rusty-snake commented on GitHub (Feb 7, 2022): 1. Why not `ignore include …`? 2. Does `whitelist /run/systemd/…` work? 3. Does the D-Bus way work?
gitea-mirror commented 2026-05-05 08:57:20 -06:00
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@sak96 commented on GitHub (Feb 7, 2022):

interesting all of the above works settling to adding the following.

# ~/.config/firejail/firefox.local
whitelist /run/systemd/resolve/io.systemd.Resolve

Thanks @rusty-snake

<!-- gh-comment-id:1031717213 --> @sak96 commented on GitHub (Feb 7, 2022): interesting all of the above works settling to adding the following. ```firejail # ~/.config/firejail/firefox.local whitelist /run/systemd/resolve/io.systemd.Resolve ``` Thanks @rusty-snake
gitea-mirror commented 2026-05-05 08:57:21 -06:00
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@rusty-snake commented on GitHub (Feb 7, 2022):

Just to confirm, firejail --ignore="dbus-system none" --dbus-system=filter --dbus-system.talk=org.freedesktop.resolve1 --blacklist=/run/systemd/resolve/io.systemd.Resolve /usr/bin/firefox (i.e. D-Bus) works too.

<!-- gh-comment-id:1031788171 --> @rusty-snake commented on GitHub (Feb 7, 2022): Just to confirm, `firejail --ignore="dbus-system none" --dbus-system=filter --dbus-system.talk=org.freedesktop.resolve1 --blacklist=/run/systemd/resolve/io.systemd.Resolve /usr/bin/firefox` (i.e. D-Bus) works too.
gitea-mirror commented 2026-05-05 08:57:22 -06:00
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@rusty-snake commented on GitHub (Feb 7, 2022):

What does grep "^hosts" /etc/nsswitch.conf show?

<!-- gh-comment-id:1031795593 --> @rusty-snake commented on GitHub (Feb 7, 2022): What does `grep "^hosts" /etc/nsswitch.conf` show?
gitea-mirror commented 2026-05-05 08:57:22 -06:00
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@sak96 commented on GitHub (Feb 8, 2022):

firejail --ignore="dbus-system none" --dbus-system=filter --dbus-system.talk=org.freedesktop.resolve1 --blacklist=/run/systemd/resolve/io.systemd.Resolve /usr/bin/firefox does not help.

grep "^hosts" /etc/nsswitch.conf shows the same result in both with fix (mentioned in last msg by me) and without

hosts: mymachines resolve [!UNAVAIL=return] files myhostname dns
<!-- gh-comment-id:1032217315 --> @sak96 commented on GitHub (Feb 8, 2022): `firejail --ignore="dbus-system none" --dbus-system=filter --dbus-system.talk=org.freedesktop.resolve1 --blacklist=/run/systemd/resolve/io.systemd.Resolve /usr/bin/firefox` does not help. `grep "^hosts" /etc/nsswitch.conf` shows the same result in both with fix (mentioned in last msg by me) and without ```text hosts: mymachines resolve [!UNAVAIL=return] files myhostname dns ```
gitea-mirror commented 2026-05-05 08:57:23 -06:00
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@rusty-snake commented on GitHub (Feb 8, 2022):

firejail --ignore="dbus-system none" --dbus-system=filter --dbus-system.talk=org.freedesktop.resolve1 --blacklist=/run/systemd/resolve/io.systemd.Resolve /usr/bin/firefox does not help.

But firejail --ignore=dbus-system --ignore=dbus-user [--blacklist=/run/systemd/resolve/io.systemd.Resolve] /usr/bin/firefox works?

hosts: mymachines resolve [!UNAVAIL=return] files myhostname dns

Let me think

<!-- gh-comment-id:1032302146 --> @rusty-snake commented on GitHub (Feb 8, 2022): > firejail --ignore="dbus-system none" --dbus-system=filter --dbus-system.talk=org.freedesktop.resolve1 --blacklist=/run/systemd/resolve/io.systemd.Resolve /usr/bin/firefox does not help. But `firejail --ignore=dbus-system --ignore=dbus-user [--blacklist=/run/systemd/resolve/io.systemd.Resolve] /usr/bin/firefox` works? > hosts: mymachines resolve [!UNAVAIL=return] files myhostname dns Let me think
gitea-mirror commented 2026-05-05 08:57:24 -06:00
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@sak96 commented on GitHub (Feb 8, 2022):

firejail --ignore=dbus-system --ignore=dbus-user [--blacklist=/run/systemd/resolve/io.systemd.Resolve] /usr/bin/firefox does not work

<!-- gh-comment-id:1032349062 --> @sak96 commented on GitHub (Feb 8, 2022): `firejail --ignore=dbus-system --ignore=dbus-user [--blacklist=/run/systemd/resolve/io.systemd.Resolve] /usr/bin/firefox` does not work
gitea-mirror commented 2026-05-05 08:57:25 -06:00
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@rusty-snake commented on GitHub (Feb 8, 2022):

Related #3492

Maybe we should remove resolve [!UNAVAIL=return] from nsswitch.conf inside the sandbox.

<!-- gh-comment-id:1032354585 --> @rusty-snake commented on GitHub (Feb 8, 2022): Related #3492 --- Maybe we should remove `resolve [!UNAVAIL=return]` from nsswitch.conf inside the sandbox.
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