/etc/apparmor.d/sbin.dhcpcanon is in dhcpcanon 0.7.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Last Modified: Fri Jul 17 11:46:19 2009
# Author: Jamie Strandboge <jamie@canonical.com>
# Modified for dhcpcanon by: juga <juga@riseup.net>, 2017.
#include <tunables/global>
/sbin/dhcpcanon flags=(attach_disconnected) {
  #include <abstractions/base>
  #include <abstractions/nameservice>
  #include <abstractions/openssl>
  capability net_bind_service,
  capability net_raw,
  capability sys_module,
  capability dac_override,
  capability net_admin,
  network packet,
  network raw,
  @{PROC}/[0-9]*/net/ r,
  @{PROC}/[0-9]*/net/** r,
  /sbin/dhcpcanon mr,
  # LP: #1197484 and LP: #1202203 - why is this needed? :(
  /bin/bash mr,
  /etc/dhcpcanon.conf r,
  /etc/dhcp/ r,
  /etc/dhcp/** r,
  /var/lib/dhcp{,3}/dhcpcanon* lrw,
  /{,var/}run/dhcpcanon*.pid lrw,
  /{,var/}run/dhcpcanon*.lease* lrw,
  # NetworkManager
  /{,var/}run/nm*conf r,
  /{,var/}run/sendsigs.omit.d/network-manager.dhcpcanon*.pid lrw,
  /var/lib/NetworkManager/dhcpcanon*.conf lrw,
  /var/lib/NetworkManager/dhcpcanon*.lease* lrw,
  signal (receive) peer=/usr/sbin/NetworkManager,
  ptrace (readby) peer=/usr/sbin/NetworkManager,
  # connman
  /{,var/}run/connman/dhcpcanon*.pid lrw,
  /{,var/}run/connman/dhcpcanon*.leases lrw,
  # synce-hal
  /usr/share/synce-hal/dhcpcanon.conf r,
  # if there is a custom script, let it run unconfined
  /etc/dhcp/dhcpcanon-script Uxr,
  # The dhcpcanon-script shell script sources other shell scripts rather than
  # executing them, so we can't just use a separate profile for dhcpcanon-script
  # with 'Uxr' on the hook scripts. However, for the long-running dhcpcanon3
  # daemon to run arbitrary code via /sbin/dhcpcanon-script, it would need to be
  # able to subvert dhcpcanon-script or write to the hooks.d directories. As
  # such, if the dhcpcanon3 daemon is subverted, this effectively limits it to
  # only being able to run the hooks scripts.
  /sbin/dhcpcanon-script                           Uxr,
  # Run the ELF executables under their own unrestricted profiles
  /usr/lib/NetworkManager/nm-dhcp-client.action   Pxrm,
  /usr/lib/connman/scripts/dhcpcanon-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.dhcpcanon>
}
/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/dhcpcanon,
  /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/dhcpcanon-script {
  #include <abstractions/base>
  #include <abstractions/dbus>
  /usr/lib/connman/scripts/dhcpcanon-script      mr,
  network inet dgram,
  network inet6 dgram,
}
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