/
dbus.go
85 lines (73 loc) · 2.16 KB
/
dbus.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2015 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 snappy
import (
"bytes"
"regexp"
"text/template"
"github.com/ubuntu-core/snappy/logger"
)
func verifyBusName(busName string) error {
// http://dbus.freedesktop.org/doc/dbus-specification.html
rs := "^[A-Za-z0-9][A-Za-z0-9_-]*(\\.[A-Za-z0-9][A-Za-z0-9_-]*)+$"
r, err := regexp.Compile(rs)
if err != nil {
return err
}
if !r.MatchString(busName) {
return &ErrStructIllegalContent{
Field: "bus-name",
Content: busName,
Whitelist: rs,
}
}
return nil
}
func genBusPolicyFile(busName string) (string, error) {
if err := verifyBusName(busName); err != nil {
return "", err
}
policyTemplate := `<?xml version="1.0"?> <!--*-nxml-*-->
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<!--
This file is autogenerated by snappy
-->
<busconfig>
<policy user="root">
<allow own="{{.BusName}}"/>
<allow send_destination="{{.BusName}}"/>
</policy>
<policy context="default">
<allow send_destination="{{.BusName}}"/>
</policy>
</busconfig>
`
var templateOut bytes.Buffer
t := template.Must(template.New("wrapper").Parse(policyTemplate))
wrapperData := struct {
BusName string
}{
busName,
}
if err := t.Execute(&templateOut, wrapperData); err != nil {
// this can never happen, except we forget a variable
logger.Panicf("Unable to execute template: %v", err)
}
return templateOut.String(), nil
}