This patch implements the parsing of DBus rules.
It attempts to catch all corner cases, such as specifying a bind
permission with an interface conditional or specifying a subject name
conditional and a peer name conditional in the same rule.
It introduces the concept of conditional lists to the lexer and parser
in order to handle 'peer=(label=/usr/bin/foo name=com.foo.bar)', since
the existing list support in the lexer only supports a list of values.
The DBus rules are encoded as follows:
bus,name<bind_perm>,peer_label,path,interface,member<rw_perms>
Bind rules stop matching at name<bind_perm>. Note that name is used for
the subject name in bind rules and the peer name in rw rules. The
function new_dbus_entry() is what does the proper sanitization to make
sure that if a name conditional is specified, that it is the subject
name in the case of a bind rule or that it is the peer name in the case
of a rw rule.
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>
