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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2025 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package prompting
import (
"github.com/snapcore/snapd/interfaces/apparmor"
prompting_errors "github.com/snapcore/snapd/interfaces/prompting/errors"
"github.com/snapcore/snapd/sandbox/apparmor/notify"
)
var (
apparmorInterfaceForMetadataTag = apparmor.InterfaceForMetadataTag
)
// InterfaceFromTagsets returns the interface associated with all of the given
// tagsets.
//
// Potential interfaces are identified by looking up whether a given tag is
// registered in association with a particular snapd interface.
//
// If none of the given tags are registered with an interface, then returns
// ErrNoInterfaceTags.
//
// If tags are registered with more than one interface, then returns
// ErrMultipleInterfaces.
//
// If one interface is associated with tags in the tagsets but those tags are
// not found in every tagset, then returns ErrNoCommonInterface.
func InterfaceFromTagsets(tagsets notify.TagsetMap) (iface string, err error) {
if len(tagsets) == 0 {
return "", prompting_errors.ErrNoInterfaceTags
}
aPermHadNoInterfaces := false
for _, tagset := range tagsets {
thisPermHasNoInterfaces := true
for _, tag := range tagset {
tagIface, ok := apparmorInterfaceForMetadataTag(tag)
if !ok {
continue
}
if iface != "" && tagIface != iface {
// We already saw a different interface
return "", prompting_errors.ErrMultipleInterfaces
}
iface = tagIface
thisPermHasNoInterfaces = false
}
if thisPermHasNoInterfaces {
aPermHadNoInterfaces = true
}
}
if iface == "" {
// No tags matched any interface
return "", prompting_errors.ErrNoInterfaceTags
}
if aPermHadNoInterfaces {
// At least one tagset matched an interface, but not all of them
return "", prompting_errors.ErrNoCommonInterface
}
return iface, nil
}
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