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Dir : ~/etc/apparmor/init/network-interface-security/

Edit File: sbin.dhclient

# vim:syntax=apparmor
#include <tunables/global>

/{,usr/}sbin/dhclient flags=(attach_disconnected) {
  #include <abstractions/base>
  #include <abstractions/nameservice>
  #include <abstractions/openssl>

capability net_bind_service,
  capability net_raw,
  capability dac_override,
  capability net_admin,

network packet,
  network raw,

@{PROC}/[0-9]*/net/ r,
  @{PROC}/[0-9]*/net/** r,

# dhclient wants to update its threads with functional names
  # https://gitlab.com/apparmor/apparmor/-/merge_requests/730
  # see LP: #1918410
  owner @{PROC}/@{pid}/task/[0-9]*/comm rw,

# LP: #1926139
  @{PROC}/cmdline r,

/{,usr/}sbin/dhclient mr,
  # LP: #1197484 and LP: #1202203 - why is this needed? :(
  /{,usr/}bin/bash mr,

/etc/dhclient.conf r,
  /etc/dhcp/ r,
  /etc/dhcp/** r,

/var/lib/dhcp{,3}/dhclient* lrw,
  /{,var/}run/dhclient*.pid lrw,
  /{,var/}run/dhclient*.lease* lrw,

# NetworkManager
  /{,var/}run/nm*conf r,
  /{,var/}run/sendsigs.omit.d/network-manager.dhclient*.pid lrw,
  /{,var/}run/NetworkManager/dhclient*.pid lrw,
  /var/lib/NetworkManager/dhclient*.conf lrw,
  /var/lib/NetworkManager/dhclient*.lease* lrw,
  signal (receive) peer=/usr/sbin/NetworkManager,
  ptrace (readby) peer=/usr/sbin/NetworkManager,

# connman
  /{,var/}run/connman/dhclient*.pid lrw,
  /{,var/}run/connman/dhclient*.leases lrw,

# synce-hal
  /usr/share/synce-hal/dhclient.conf r,

# if there is a custom script, let it run unconfined
  /etc/dhcp/dhclient-script Uxr,

# The dhclient-script shell script sources other shell scripts rather than
  # executing them, so we can't just use a separate profile for dhclient-script
  # with 'Uxr' on the hook scripts. However, for the long-running dhclient3
  # daemon to run arbitrary code via /sbin/dhclient-script, it would need to be
  # able to subvert dhclient-script or write to the hooks.d directories. As
  # such, if the dhclient3 daemon is subverted, this effectively limits it to
  # only being able to run the hooks scripts.
  /{,usr/}sbin/dhclient-script                           Uxr,

# Run the ELF executables under their own unrestricted profiles
  /usr/lib/NetworkManager/nm-dhcp-client.action   Pxrm,
  /usr/lib/connman/scripts/dhclient-script        Pxrm,

# Support the new executable helper from NetworkManager.
  /usr/lib/NetworkManager/nm-dhcp-helper          Pxrm,
  signal (receive) peer=/usr/lib/NetworkManager/nm-dhcp-helper,

# Site-specific additions and overrides. See local/README for details.
  #include <local/sbin.dhclient>
}

/usr/lib/NetworkManager/nm-dhcp-client.action {
  #include <abstractions/base>
  #include <abstractions/dbus>
  /usr/lib/NetworkManager/nm-dhcp-client.action mr,

/var/lib/NetworkManager/*lease r,
  signal (receive) peer=/usr/sbin/NetworkManager,
  ptrace (readby) peer=/usr/sbin/NetworkManager,
  network inet dgram,
  network inet6 dgram,
}

/usr/lib/NetworkManager/nm-dhcp-helper {
  #include <abstractions/base>
  #include <abstractions/dbus>
  /usr/lib/NetworkManager/nm-dhcp-helper mr,

/run/NetworkManager/private-dhcp rw,
  signal (send) peer=/sbin/dhclient,

/var/lib/NetworkManager/*lease r,
  signal (receive) peer=/usr/sbin/NetworkManager,
  ptrace (readby) peer=/usr/sbin/NetworkManager,
  network inet dgram,
  network inet6 dgram,
}

/usr/lib/connman/scripts/dhclient-script {
  #include <abstractions/base>
  #include <abstractions/dbus>
  /usr/lib/connman/scripts/dhclient-script      mr,
  network inet dgram,
  network inet6 dgram,
}