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systemd/network/80-namespace-ns.network

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nsresourced: add new daemon for granting clients user namespaces and assigning resources to them This adds a small, socket-activated Varlink daemon that can delegate UID ranges for user namespaces to clients asking for it. The primary call is AllocateUserRange() where the user passes in an uninitialized userns fd, which is then set up. There are other calls that allow assigning a mount fd to a userns allocated that way, to set up permissions for a cgroup subtree, and to allocate a veth for such a user namespace. Since the UID assignments are supposed to be transitive, i.e. not permanent, care is taken to ensure that users cannot create inodes owned by these UIDs, so that persistancy cannot be acquired. This is implemented via a BPF-LSM module that ensures that any member of a userns allocated that way cannot create files unless the mount it operates on is owned by the userns itself, or is explicitly allowelisted. BPF LSM program with contributions from Alexei Starovoitov.
2023-04-20 20:07:33 +03:00
# SPDX-License-Identifier: MIT-0
#
# This config file is installed as part of systemd.
# It may be freely copied and edited (following the MIT No Attribution license).
#
network: suggest using "networkctl edit" instead of copying manually
2024-04-23 14:51:07 +03:00
# To make local modifications, use "networkctl edit". See networkctl(1) for details.
nsresourced: add new daemon for granting clients user namespaces and assigning resources to them This adds a small, socket-activated Varlink daemon that can delegate UID ranges for user namespaces to clients asking for it. The primary call is AllocateUserRange() where the user passes in an uninitialized userns fd, which is then set up. There are other calls that allow assigning a mount fd to a userns allocated that way, to set up permissions for a cgroup subtree, and to allocate a veth for such a user namespace. Since the UID assignments are supposed to be transitive, i.e. not permanent, care is taken to ensure that users cannot create inodes owned by these UIDs, so that persistancy cannot be acquired. This is implemented via a BPF-LSM module that ensures that any member of a userns allocated that way cannot create files unless the mount it operates on is owned by the userns itself, or is explicitly allowelisted. BPF LSM program with contributions from Alexei Starovoitov.
2023-04-20 20:07:33 +03:00
# This file should not be edited in place, because it'll be overwritten on upgrades.
# This network file matches the host-side of the virtual Ethernet link
# created by systemd-nsresourced's network support. See systemd-nsresourced(1) for
# details.
[Match]
Kind=veth
Name=ns-*
[Network]
# Default to using a /28 prefix, giving up to 13 addresses per namespace
Address=0.0.0.0/28
LinkLocalAddressing=yes
DHCPServer=yes
IPMasquerade=both
LLDP=yes
EmitLLDP=customer-bridge
IPv6AcceptRA=no
IPv6SendRA=yes
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