/
netlink_audit.go
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/
netlink_audit.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017 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 builtin
import (
"errors"
"github.com/snapcore/snapd/interfaces"
apparmor_sandbox "github.com/snapcore/snapd/sandbox/apparmor"
"github.com/snapcore/snapd/strutil"
)
const netlinkAuditSummary = `allows access to kernel audit system through netlink`
const netlinkAuditBaseDeclarationSlots = `
netlink-audit:
allow-installation:
slot-snap-type:
- core
deny-auto-connection: true
`
const netlinkAuditConnectedPlugSecComp = `
# Description: Can use netlink to read/write to kernel audit system.
bind
socket AF_NETLINK - NETLINK_AUDIT
`
const netlinkAuditConnectedPlugAppArmor = `
# Description: Can use netlink to read/write to kernel audit system.
network netlink,
# CAP_NET_ADMIN required for multicast netlink sockets per 'man 7 netlink'
capability net_admin,
# CAP_AUDIT_READ required to read the audit log via the netlink multicast socket
# per 'man 7 capabilities'
capability audit_read,
# CAP_AUDIT_WRITE required to write to the audit log via the netlink multicast
# socket per 'man 7 capabilities'
capability audit_write,
`
type netlinkAuditInterface struct {
commonInterface
}
func (iface *netlinkAuditInterface) BeforeConnectPlug(plug *interfaces.ConnectedPlug) error {
if apparmor_sandbox.ProbedLevel() == apparmor_sandbox.Unsupported {
// no apparmor means we don't have to deal with parser features
return nil
}
features, err := apparmor_sandbox.ParserFeatures()
if err != nil {
return err
}
if !strutil.ListContains(features, "cap-audit-read") {
// the host system doesn't have the required feature to compile the
// policy (that happens in 14.04)
return errors.New("cannot connect plug on system without audit_read support")
}
return nil
}
func init() {
registerIface(&netlinkAuditInterface{commonInterface{
name: "netlink-audit",
summary: netlinkAuditSummary,
implicitOnCore: true,
implicitOnClassic: true,
baseDeclarationSlots: netlinkAuditBaseDeclarationSlots,
connectedPlugSecComp: netlinkAuditConnectedPlugSecComp,
connectedPlugAppArmor: netlinkAuditConnectedPlugAppArmor,
}})
}