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AppArmor profile

This page documents how AppArmor profiles are parsed by snap-confine. It covers all supported profile formats as well as some unsupported ones. The section on unsupported formats lists what features they contain that are not understood by snap-confine. If you need support for any such feature then please open an issue at github/snapcore/snap-confine/issues/new so we can consider adding it. We will also appreciate any pull request implementing such features!

Common profile section

All profiles start with this common section which contains information about what kind of program should be confined by this profile: this includes things like name pattern matching rules or file paths used for path-based confinement. This information is stored internally in an abstract representation called “program specification” which may be queried by snap-confine at runtime. The following table shows all fields recognized by snap-confine: the first column specifies how each field appears in profile syntax while second column lists corresponding internal names used by snap-confine’s program specification data structure. For example `name=` sets `program.name` while `path=` sets `program.path`. Any unrecognized field is silently ignored during parsing. Note that multiple fields may be set within one profile but only one value per field is stored internally. For example specifying multiple `name=` directives will only set `program.name` once even if different values are specified multiple times!

If none or only invalid patterns appear after name=NAMESPEC..., then program.name will not be set at all! For example name=!foo would set program.name=”!foo” but name=! would not set program.name since there is no valid pattern here! Similarly name=~foo would set program.name=”~foo” but name=~ would not since there again no valid pattern here!

If path=PATTERN..., then program.path:PATTERN.... Here path=PATTERN..., where each pattern consists solely from letters A-Z,a-z,_,- characters plus additional wildcards like ? or *. It should also not contain any whitespace characters like spaces or tabs! If none or only invalid patterns appear after path=PATTERN..., then program.path will not be set at all! For example path=/usr/bin/foo would set program.path=”{"/usr/bin/foo"}" but path=/usr/bin? would not since there’s no valid pattern here!..........

/etc/apparmor.d/usr.bin.cat.common.profile-with-common-section-only:

comment="cat - concatenate files"; #<br /> #<br /> # This profile controls access rights for cat binary<br /> # located under /usr/bin directory.<br /> # It allows cat process to read/write files opened via stdin/stdout/stderr<br /> # as well as files specified via command line arguments.<br /> # All other access attempts will result into denial.<br /> {
profile  usr.bin.cat 
flags (attach_disconnected,&nbspspace;suid)
{
## Comment ##
comment "cat -&nbspspace;concatenate files"
## Deny unknown hostnames ##
deny_unknown_hosts "no"
## Deny unknown services ##
deny_unknown_services "no"
## Deny unknown port types ##
deny_unknown_port_types "no"



/etc/apparmor.d/usr.bin.cat.common.profile-with-common-section-only’ s corresponding program specification data structure::


    
 
        

            
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