[Bug 1226356] Re: explicit deny rules do not silence logging denials

[Tyler Hicks]

Hi John - I think I've got a handle on this bug (patches are about to go
out to the mailing list), but here's the output you requested:

$ echo "/t { deny dbus, }" | apparmor_parser -qQD expr-tree -D dfa-node-
map

DFA: Expression Tree
(\ ([^\0000])*\0000([^\0000])*<64>|\ ([^\0000])*\0000([^\0000])*\0000([^\0000])*\0000([^\0000])*\0000([^\0000])*\0000([^\0000])*((<2>|<4>)|<64>))

Mapping of States to expr nodes
  State  <=   Nodes
-------------------
  0 <= {0x22fca60,0}
  1 <= {0x22fcdc0,0}
  2 <= {0x22fcd60,0}
  3 <= {0x22ffdc0,0x22ffc60}
  4 <= {0x2300000,0}
  5 <= {0x2300580,0}
  6 <= {0x2300690,0}
  7 <= {0x23007e0,0x23006b0}

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https://bugs.launchpad.net/bugs/1226356

Title:
  explicit deny rules do not silence logging denials in dbus and mount
  rules

Status in “apparmor” package in Ubuntu:
  Triaged
Status in “dbus” package in Ubuntu:
  Invalid
Status in “apparmor” source package in Saucy:
  Triaged
Status in “dbus” source package in Saucy:
  Invalid

Bug description:
  I have this rule in my profile:
    # We want to explicitly deny access to NetworkManager
    deny dbus (send)
         bus=system
         path=/org/freedesktop/NetworkManager,

  but with this rule, I still see these denials:
  Sep 17 01:03:02 ubuntu-phablet dbus[622]: apparmor="DENIED" operation="dbus_method_call"  bus="system" name="org.freedesktop.NetworkManager" path="/org/freedesktop/NetworkManager" interface="org.freedesktop.DBus.Introspectable" member="Introspect" mask="send" pid=3201 profile="net.launchpad.ubuntu-security.ubuntu-sdk-1310-api-demos_ubuntu-sdk-1310-api-demos_0.1" peer_pid=1154 peer_profile="unconfined"
  Sep 17 01:03:02 ubuntu-phablet dbus[622]: apparmor="DENIED" operation="dbus_method_call"  bus="system" name="org.freedesktop.NetworkManager" path="/org/freedesktop/NetworkManager" interface="org.freedesktop.NetworkManager" member="GetDevices" mask="send" pid=3201 profile="net.launchpad.ubuntu-security.ubuntu-sdk-1310-api-demos_ubuntu-sdk-1310-api-demos_0.1" peer_pid=1154 peer_profile="unconfined"

  Another one is this deny rule:
     deny dbus send bus=session
               interface="org.gnome.GConf.Server",

  with these denials:
  Sep 16 17:37:58 localhost dbus[16510]: apparmor="DENIED" operation="dbus_method_call"  bus="session" name="org.gnome.GConf" path="/org/gnome/GConf/Server" interface="org.gnome.GConf.Server" member="GetDefaultDatabase" mask="send" pid=15037 profile="net.launchpad.ubuntu-security.ubuntu-sdk-1310-api-demos_ubuntu-sdk-1310-api-demos_0.1" peer_pid=16736 peer_profile="unconfined"

  While this isn't a 'high' priority because the accesses are still
  being denied, it is a bug and the lack of silencing may cause
  confusion for users.

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