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firewaller.go
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firewaller.go
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// Copyright 2014 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package firewaller
import (
"github.com/juju/errors"
"github.com/juju/names"
"github.com/juju/juju/apiserver/common"
"github.com/juju/juju/apiserver/params"
"github.com/juju/juju/network"
"github.com/juju/juju/state"
"github.com/juju/juju/state/watcher"
)
func init() {
// Version 0 is no longer supported.
common.RegisterStandardFacade("Firewaller", 1, NewFirewallerAPI)
}
// FirewallerAPI provides access to the Firewaller API facade.
type FirewallerAPI struct {
*common.LifeGetter
*common.EnvironWatcher
*common.AgentEntityWatcher
*common.UnitsWatcher
*common.EnvironMachinesWatcher
*common.InstanceIdGetter
st *state.State
resources *common.Resources
authorizer common.Authorizer
accessUnit common.GetAuthFunc
accessService common.GetAuthFunc
accessMachine common.GetAuthFunc
accessEnviron common.GetAuthFunc
}
// NewFirewallerAPI creates a new server-side FirewallerAPI facade.
func NewFirewallerAPI(
st *state.State,
resources *common.Resources,
authorizer common.Authorizer,
) (*FirewallerAPI, error) {
if !authorizer.AuthEnvironManager() {
// Firewaller must run as environment manager.
return nil, common.ErrPerm
}
// Set up the various authorization checkers.
accessEnviron := common.AuthFuncForTagKind(names.EnvironTagKind)
accessUnit := common.AuthFuncForTagKind(names.UnitTagKind)
accessService := common.AuthFuncForTagKind(names.ServiceTagKind)
accessMachine := common.AuthFuncForTagKind(names.MachineTagKind)
accessUnitOrService := common.AuthEither(accessUnit, accessService)
accessUnitServiceOrMachine := common.AuthEither(accessUnitOrService, accessMachine)
// Life() is supported for units, services or machines.
lifeGetter := common.NewLifeGetter(
st,
accessUnitServiceOrMachine,
)
// EnvironConfig() and WatchForEnvironConfigChanges() are allowed
// with unrestriced access.
environWatcher := common.NewEnvironWatcher(
st,
resources,
authorizer,
)
// Watch() is supported for services only.
entityWatcher := common.NewAgentEntityWatcher(
st,
resources,
accessService,
)
// WatchUnits() is supported for machines.
unitsWatcher := common.NewUnitsWatcher(st,
resources,
accessMachine,
)
// WatchEnvironMachines() is allowed with unrestricted access.
machinesWatcher := common.NewEnvironMachinesWatcher(
st,
resources,
authorizer,
)
// InstanceId() is supported for machines.
instanceIdGetter := common.NewInstanceIdGetter(
st,
accessMachine,
)
return &FirewallerAPI{
LifeGetter: lifeGetter,
EnvironWatcher: environWatcher,
AgentEntityWatcher: entityWatcher,
UnitsWatcher: unitsWatcher,
EnvironMachinesWatcher: machinesWatcher,
InstanceIdGetter: instanceIdGetter,
st: st,
resources: resources,
authorizer: authorizer,
accessUnit: accessUnit,
accessService: accessService,
accessMachine: accessMachine,
accessEnviron: accessEnviron,
}, nil
}
// WatchOpenedPorts returns a new StringsWatcher for each given
// environment tag.
func (f *FirewallerAPI) WatchOpenedPorts(args params.Entities) (params.StringsWatchResults, error) {
result := params.StringsWatchResults{
Results: make([]params.StringsWatchResult, len(args.Entities)),
}
if len(args.Entities) == 0 {
return result, nil
}
canWatch, err := f.accessEnviron()
if err != nil {
return params.StringsWatchResults{}, errors.Trace(err)
}
for i, entity := range args.Entities {
tag, err := names.ParseTag(entity.Tag)
if err != nil {
result.Results[i].Error = common.ServerError(common.ErrPerm)
continue
}
if !canWatch(tag) {
result.Results[i].Error = common.ServerError(common.ErrPerm)
continue
}
watcherId, initial, err := f.watchOneEnvironOpenedPorts(tag)
if err != nil {
result.Results[i].Error = common.ServerError(err)
continue
}
result.Results[i].StringsWatcherId = watcherId
result.Results[i].Changes = initial
}
return result, nil
}
func (f *FirewallerAPI) watchOneEnvironOpenedPorts(tag names.Tag) (string, []string, error) {
// NOTE: tag is ignored, as there is only one environment in the
// state DB. Once this changes, change the code below accordingly.
watch := f.st.WatchOpenedPorts()
// Consume the initial event and forward it to the result.
if changes, ok := <-watch.Changes(); ok {
return f.resources.Register(watch), changes, nil
}
return "", nil, watcher.EnsureErr(watch)
}
// GetMachinePorts returns the port ranges opened on a machine for the
// specified network as a map mapping port ranges to the tags of the
// units that opened them.
func (f *FirewallerAPI) GetMachinePorts(args params.MachinePortsParams) (params.MachinePortsResults, error) {
result := params.MachinePortsResults{
Results: make([]params.MachinePortsResult, len(args.Params)),
}
canAccess, err := f.accessMachine()
if err != nil {
return params.MachinePortsResults{}, err
}
for i, param := range args.Params {
machineTag, err := names.ParseMachineTag(param.MachineTag)
if err != nil {
result.Results[i].Error = common.ServerError(common.ErrPerm)
continue
}
networkTag, err := names.ParseNetworkTag(param.NetworkTag)
if err != nil {
result.Results[i].Error = common.ServerError(common.ErrPerm)
continue
}
machine, err := f.getMachine(canAccess, machineTag)
if err != nil {
result.Results[i].Error = common.ServerError(err)
continue
}
ports, err := machine.OpenedPorts(networkTag.Id())
if err != nil {
result.Results[i].Error = common.ServerError(err)
continue
}
if ports != nil {
portRangeMap := ports.AllPortRanges()
var portRanges []network.PortRange
for portRange := range portRangeMap {
portRanges = append(portRanges, portRange)
}
network.SortPortRanges(portRanges)
for _, portRange := range portRanges {
unitTag := names.NewUnitTag(portRangeMap[portRange]).String()
result.Results[i].Ports = append(result.Results[i].Ports,
params.MachinePortRange{
UnitTag: unitTag,
PortRange: params.FromNetworkPortRange(portRange),
})
}
}
}
return result, nil
}
// GetMachineActiveNetworks returns the tags of the all networks the
// each given machine has open ports on.
func (f *FirewallerAPI) GetMachineActiveNetworks(args params.Entities) (params.StringsResults, error) {
result := params.StringsResults{
Results: make([]params.StringsResult, len(args.Entities)),
}
canAccess, err := f.accessMachine()
if err != nil {
return params.StringsResults{}, err
}
for i, entity := range args.Entities {
machineTag, err := names.ParseMachineTag(entity.Tag)
if err != nil {
result.Results[i].Error = common.ServerError(common.ErrPerm)
continue
}
machine, err := f.getMachine(canAccess, machineTag)
if err != nil {
result.Results[i].Error = common.ServerError(err)
continue
}
ports, err := machine.AllPorts()
if err != nil {
result.Results[i].Error = common.ServerError(err)
continue
}
for _, port := range ports {
networkTag := names.NewNetworkTag(port.NetworkName()).String()
result.Results[i].Result = append(result.Results[i].Result, networkTag)
}
}
return result, nil
}
// GetExposed returns the exposed flag value for each given service.
func (f *FirewallerAPI) GetExposed(args params.Entities) (params.BoolResults, error) {
result := params.BoolResults{
Results: make([]params.BoolResult, len(args.Entities)),
}
canAccess, err := f.accessService()
if err != nil {
return params.BoolResults{}, err
}
for i, entity := range args.Entities {
tag, err := names.ParseServiceTag(entity.Tag)
if err != nil {
result.Results[i].Error = common.ServerError(common.ErrPerm)
continue
}
service, err := f.getService(canAccess, tag)
if err == nil {
result.Results[i].Result = service.IsExposed()
}
result.Results[i].Error = common.ServerError(err)
}
return result, nil
}
// GetAssignedMachine returns the assigned machine tag (if any) for
// each given unit.
func (f *FirewallerAPI) GetAssignedMachine(args params.Entities) (params.StringResults, error) {
result := params.StringResults{
Results: make([]params.StringResult, len(args.Entities)),
}
canAccess, err := f.accessUnit()
if err != nil {
return params.StringResults{}, err
}
for i, entity := range args.Entities {
tag, err := names.ParseUnitTag(entity.Tag)
if err != nil {
result.Results[i].Error = common.ServerError(common.ErrPerm)
continue
}
unit, err := f.getUnit(canAccess, tag)
if err == nil {
var machineId string
machineId, err = unit.AssignedMachineId()
if err == nil {
result.Results[i].Result = names.NewMachineTag(machineId).String()
}
}
result.Results[i].Error = common.ServerError(err)
}
return result, nil
}
func (f *FirewallerAPI) getEntity(canAccess common.AuthFunc, tag names.Tag) (state.Entity, error) {
if !canAccess(tag) {
return nil, common.ErrPerm
}
return f.st.FindEntity(tag)
}
func (f *FirewallerAPI) getUnit(canAccess common.AuthFunc, tag names.UnitTag) (*state.Unit, error) {
entity, err := f.getEntity(canAccess, tag)
if err != nil {
return nil, err
}
// The authorization function guarantees that the tag represents a
// unit.
return entity.(*state.Unit), nil
}
func (f *FirewallerAPI) getService(canAccess common.AuthFunc, tag names.ServiceTag) (*state.Service, error) {
entity, err := f.getEntity(canAccess, tag)
if err != nil {
return nil, err
}
// The authorization function guarantees that the tag represents a
// service.
return entity.(*state.Service), nil
}
func (f *FirewallerAPI) getMachine(canAccess common.AuthFunc, tag names.MachineTag) (*state.Machine, error) {
entity, err := f.getEntity(canAccess, tag)
if err != nil {
return nil, err
}
// The authorization function guarantees that the tag represents a
// machine.
return entity.(*state.Machine), nil
}