apparmor_xattrs

APPARMOR_XATTRS(7)                 AppArmor                 APPARMOR_XATTRS(7)

NAME
       apparmor_xattrs - AppArmor profile xattr(7) matching

DESCRIPTION
       AppArmor profiles can conditionally match files based on the presence
       and value of extended attributes in addition to file path. The
       following profile applies to any file under "/usr/bin" where the
       "security.apparmor" extended attribute has the value "trusted":

               profile trusted /usr/bin/* xattrs=(security.apparmor="trusted") {
                       # ...
               }

       Note that "security.apparmor" and "trusted" are arbitrary, and profiles
       can match based on the value of any attribute.

       The xattrs value may also contain a path regex:

               profile trusted /usr/bin/* xattrs=(user.trust="tier/*") {

                       # ...
               }

       The getfattr(1) and setfattr(1) tools can be used to view and manage
       xattr values:

               $ setfattr -n 'security.apparmor' -v 'trusted' /usr/bin/example-tool
               $ getfattr --absolute-names -d -m - /usr/bin/example-tool
               # file: usr/bin/example-tool
               security.apparmor="trusted"

       The priority of each profile is determined by the length of the path,
       then the number of xattrs specified. A more specific path is preferred
       over xattr matches:

               # Highest priority, longest path.
               profile example1 /usr/bin/example-tool {
                       # ...
               }

               # Lower priority than the longer path, but higher priority than a rule
               # with fewer xattr matches.
               profile example2 /usr/** xattrs=(
                       security.apparmor="trusted"
                       user.domain="**"
               ) {
                       # ...
               }

               # Lowest priority. Same path length as the second profile, but has
               # fewer xattr matches.
               profile example2 /usr/** {
                       # ...
               }

       xattr matching requires the following kernel feature:

               /sys/kernel/security/apparmor/features/domain/attach_conditions/xattr

KNOWN ISSUES
       AppArmor profiles currently can't reliably match extended attributes
       with binary values such as security.evm and security.ima. In the future
       AppArmor may gain the ability to match based on the presence of certain
       attributes while ignoring their values.

SEE ALSO
       apparmor(8), apparmor_parser(8), apparmor.d(5), xattr(7),
       aa-autodep(1), clean(1), auditd(8), getfattr(1), setfattr(1), and
       <https://wiki.apparmor.net>.

AppArmor 3.0.4                    2024-03-06                APPARMOR_XATTRS(7)