/
facade.go
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/
facade.go
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// Copyright 2016 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package sshclient
import (
stdcontext "context"
"sort"
"github.com/juju/errors"
"github.com/juju/juju/apiserver/authentication"
apiservererrors "github.com/juju/juju/apiserver/errors"
"github.com/juju/juju/apiserver/facade"
k8scloud "github.com/juju/juju/caas/kubernetes/cloud"
k8sprovider "github.com/juju/juju/caas/kubernetes/provider"
"github.com/juju/juju/core/leadership"
"github.com/juju/juju/core/network"
"github.com/juju/juju/core/permission"
"github.com/juju/juju/environs"
environscloudspec "github.com/juju/juju/environs/cloudspec"
"github.com/juju/juju/environs/context"
"github.com/juju/juju/rpc/params"
"github.com/juju/juju/state"
)
type newCaasBrokerFunc func(_ stdcontext.Context, args environs.OpenParams) (Broker, error)
// Facade implements the API required by the sshclient worker.
type Facade struct {
backend Backend
authorizer facade.Authorizer
callContext context.ProviderCallContext
leadershipReader leadership.Reader
getBroker newCaasBrokerFunc
}
func internalFacade(
backend Backend, leadershipReader leadership.Reader, auth facade.Authorizer, callCtx context.ProviderCallContext,
getBroker newCaasBrokerFunc,
) (*Facade, error) {
if !auth.AuthClient() {
return nil, apiservererrors.ErrPerm
}
return &Facade{
backend: backend,
authorizer: auth,
callContext: callCtx,
leadershipReader: leadershipReader,
getBroker: getBroker,
}, nil
}
func (facade *Facade) checkIsModelAdmin() error {
err := facade.authorizer.HasPermission(permission.SuperuserAccess, facade.backend.ControllerTag())
if err != nil && !errors.Is(err, authentication.ErrorEntityMissingPermission) {
return errors.Trace(err)
}
if err == nil {
return nil
}
return facade.authorizer.HasPermission(permission.AdminAccess, facade.backend.ModelTag())
}
// PublicAddress reports the preferred public network address for one
// or more entities. Machines and units are supported.
func (facade *Facade) PublicAddress(args params.Entities) (params.SSHAddressResults, error) {
if err := facade.checkIsModelAdmin(); err != nil {
return params.SSHAddressResults{}, errors.Trace(err)
}
getter := func(m SSHMachine) (network.SpaceAddress, error) { return m.PublicAddress() }
return facade.getAddressPerEntity(args, getter)
}
// PrivateAddress reports the preferred private network address for one or
// more entities. Machines and units are supported.
func (facade *Facade) PrivateAddress(args params.Entities) (params.SSHAddressResults, error) {
if err := facade.checkIsModelAdmin(); err != nil {
return params.SSHAddressResults{}, errors.Trace(err)
}
getter := func(m SSHMachine) (network.SpaceAddress, error) { return m.PrivateAddress() }
return facade.getAddressPerEntity(args, getter)
}
// AllAddresses reports all addresses that might have SSH listening for each
// entity in args. The result is sorted with public addresses first.
// Machines and units are supported as entity types.
func (facade *Facade) AllAddresses(args params.Entities) (params.SSHAddressesResults, error) {
if err := facade.checkIsModelAdmin(); err != nil {
return params.SSHAddressesResults{}, errors.Trace(err)
}
getter := func(m SSHMachine) ([]network.SpaceAddress, error) {
devicesAddresses, err := m.AllDeviceSpaceAddresses()
if err != nil {
return nil, errors.Trace(err)
}
legacyAddresses := m.Addresses()
devicesAddresses = append(devicesAddresses, legacyAddresses...)
// Make the list unique
addressMap := make(map[string]bool)
var uniqueAddresses network.SpaceAddresses
for _, address := range devicesAddresses {
if !addressMap[address.Value] {
addressMap[address.Value] = true
uniqueAddresses = append(uniqueAddresses, address)
}
}
sort.Sort(uniqueAddresses)
return uniqueAddresses, nil
}
return facade.getAllEntityAddresses(args, getter)
}
func (facade *Facade) getAllEntityAddresses(args params.Entities, getter func(SSHMachine) ([]network.SpaceAddress, error)) (
params.SSHAddressesResults, error,
) {
out := params.SSHAddressesResults{
Results: make([]params.SSHAddressesResult, len(args.Entities)),
}
for i, entity := range args.Entities {
machine, err := facade.backend.GetMachineForEntity(entity.Tag)
if err != nil {
out.Results[i].Error = apiservererrors.ServerError(err)
} else {
addresses, err := getter(machine)
if err != nil {
out.Results[i].Error = apiservererrors.ServerError(err)
continue
}
out.Results[i].Addresses = make([]string, len(addresses))
for j := range addresses {
out.Results[i].Addresses[j] = addresses[j].Value
}
}
}
return out, nil
}
func (facade *Facade) getAddressPerEntity(args params.Entities, addressGetter func(SSHMachine) (network.SpaceAddress, error)) (
params.SSHAddressResults, error,
) {
out := params.SSHAddressResults{
Results: make([]params.SSHAddressResult, len(args.Entities)),
}
getter := func(m SSHMachine) ([]network.SpaceAddress, error) {
address, err := addressGetter(m)
if err != nil {
return nil, errors.Trace(err)
}
return []network.SpaceAddress{address}, nil
}
fullResults, err := facade.getAllEntityAddresses(args, getter)
if err != nil {
return params.SSHAddressResults{}, errors.Trace(err)
}
for i, result := range fullResults.Results {
if result.Error != nil {
out.Results[i].Error = result.Error
} else {
out.Results[i].Address = result.Addresses[0]
}
}
return out, nil
}
// PublicKeys returns the public SSH hosts for one or more
// entities. Machines and units are supported.
func (facade *Facade) PublicKeys(args params.Entities) (params.SSHPublicKeysResults, error) {
if err := facade.checkIsModelAdmin(); err != nil {
return params.SSHPublicKeysResults{}, errors.Trace(err)
}
out := params.SSHPublicKeysResults{
Results: make([]params.SSHPublicKeysResult, len(args.Entities)),
}
for i, entity := range args.Entities {
machine, err := facade.backend.GetMachineForEntity(entity.Tag)
if err != nil {
out.Results[i].Error = apiservererrors.ServerError(err)
} else {
keys, err := facade.backend.GetSSHHostKeys(machine.MachineTag())
if err != nil {
out.Results[i].Error = apiservererrors.ServerError(err)
} else {
out.Results[i].PublicKeys = []string(keys)
}
}
}
return out, nil
}
// Proxy returns whether SSH connections should be proxied through the
// controller hosts for the model associated with the API connection.
func (facade *Facade) Proxy() (params.SSHProxyResult, error) {
if err := facade.checkIsModelAdmin(); err != nil {
return params.SSHProxyResult{}, errors.Trace(err)
}
config, err := facade.backend.ModelConfig()
if err != nil {
return params.SSHProxyResult{}, err
}
return params.SSHProxyResult{UseProxy: config.ProxySSH()}, nil
}
// ModelCredentialForSSH returns a cloud spec for ssh purpose.
// This facade call is only used for k8s model.
func (facade *Facade) ModelCredentialForSSH() (params.CloudSpecResult, error) {
var result params.CloudSpecResult
if err := facade.checkIsModelAdmin(); err != nil {
return result, err
}
model, err := facade.backend.Model()
if err != nil {
result.Error = apiservererrors.ServerError(err)
return result, nil
}
if model.Type() != state.ModelTypeCAAS {
result.Error = apiservererrors.ServerError(errors.NotSupportedf("facade ModelCredentialForSSH for non %q model", state.ModelTypeCAAS))
return result, nil
}
spec, err := facade.backend.CloudSpec()
if err != nil {
result.Error = apiservererrors.ServerError(err)
return result, nil
}
if spec.Credential == nil {
result.Error = apiservererrors.ServerError(errors.NotValidf("cloud spec %q has empty credential", spec.Name))
return result, nil
}
token, err := facade.getExecSecretToken(spec, model)
if err != nil {
result.Error = apiservererrors.ServerError(err)
return result, nil
}
cred, err := k8scloud.UpdateCredentialWithToken(*spec.Credential, token)
if err != nil {
result.Error = apiservererrors.ServerError(err)
return result, nil
}
result.Result = ¶ms.CloudSpec{
Type: spec.Type,
Name: spec.Name,
Region: spec.Region,
Endpoint: spec.Endpoint,
IdentityEndpoint: spec.IdentityEndpoint,
StorageEndpoint: spec.StorageEndpoint,
Credential: ¶ms.CloudCredential{
AuthType: string(cred.AuthType()),
Attributes: cred.Attributes(),
},
CACertificates: spec.CACertificates,
SkipTLSVerify: spec.SkipTLSVerify,
IsControllerCloud: spec.IsControllerCloud,
}
return result, nil
}
func (facade *Facade) getExecSecretToken(cloudSpec environscloudspec.CloudSpec, model Model) (string, error) {
cfg, err := model.Config()
if err != nil {
return "", errors.Trace(err)
}
broker, err := facade.getBroker(stdcontext.TODO(), environs.OpenParams{
ControllerUUID: model.ControllerUUID(),
Cloud: cloudSpec,
Config: cfg,
})
if err != nil {
return "", errors.Annotate(err, "failed to open kubernetes client")
}
return broker.GetSecretToken(k8sprovider.ExecRBACResourceName)
}