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gdm_mock.go
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gdm_mock.go
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package testutils
import (
"context"
"fmt"
"log"
"log/slog"
"os"
"os/exec"
"path/filepath"
"strings"
"sync"
"github.com/canonical/ubuntu-desktop-provision/provd/internal/consts"
"github.com/godbus/dbus/v5"
)
var (
privateBusMU sync.Mutex
privateBuses []*privateBus
)
type privateBus struct {
conn *dbus.Conn
tempDir string
address string
cleanup func()
}
type gdmManagerBus struct{}
func (g gdmManagerBus) OpenSession() (interface{}, *dbus.Error) {
bus, err := setupPrivateBus()
if err != nil {
return "", dbus.NewError(consts.DbusGdmPrefix+".Manager.OpenSession", []interface{}{"failed to open session"})
}
// Add the bus to the list of private buses so it can be cleaned up later
privateBusMU.Lock()
defer privateBusMU.Unlock()
privateBuses = append(privateBuses, bus)
return bus.address, nil
}
// ExportGdmMock exports a mock GDM Manager on the system bus.
func ExportGdmMock(conn *dbus.Conn) error {
g := gdmManagerBus{}
if err := conn.Export(g, dbus.ObjectPath("/org/gnome/DisplayManager/Manager"), consts.DbusGdmPrefix+".Manager"); err != nil {
return fmt.Errorf("could not export GDM Manager mock: %w", err)
}
reply, err := conn.RequestName(consts.DbusGdmPrefix, dbus.NameFlagDoNotQueue)
if err != nil {
return fmt.Errorf("failed to acquire account name on local system bus: %w", err)
}
if reply != dbus.RequestNameReplyPrimaryOwner {
return fmt.Errorf("failed to acquire account name on local system bus: name already taken")
}
return nil
}
type gdmSessionBus struct {
conn *dbus.Conn
username string
}
func (g *gdmSessionBus) Ping() *dbus.Error {
return nil
}
func (g *gdmSessionBus) BeginVerificationForUser(serviceName, username string, s dbus.Sender) (interface{}, *dbus.Error) {
// Save the username for later verification
if username == "begin-verification-fails" {
return "", dbus.NewError(consts.DbusGdmPrefix+".UserVerifier.BeginVerificationForUser.Error.Failed", []interface{}{"failed to begin verification"})
}
g.username = username
_ = emitSignal(g.conn, dbus.ObjectPath("/org/gnome/DisplayManager/Session"), string(s), consts.DbusGdmPrefix+".UserVerifier.SecretInfoQuery", "gdm-password", "foobar")
return "", nil
}
func (g *gdmSessionBus) AnswerQuery(serviceName, answer string, s dbus.Sender) *dbus.Error {
if answer == "answer-query-fails" {
slog.Info(fmt.Sprintf("Answer Query - username: %s, password: %s", g.username, answer))
return dbus.NewError(consts.DbusGdmPrefix+".UserVerifier.AnswerQuery.Error.Failed", []interface{}{"failed to answer query"})
}
if g.username != "myuser" || answer != "mypassword" {
_ = emitSignal(g.conn, dbus.ObjectPath("/org/gnome/DisplayManager/Session"), string(s), consts.DbusGdmPrefix+".UserVerifier.Problem", "gdm-password", "Invalid username or password")
return nil
}
_ = emitSignal(g.conn, dbus.ObjectPath("/org/gnome/DisplayManager/Session"), string(s), consts.DbusGdmPrefix+".Greeter.SessionOpened", "gdm-password")
return nil
}
func (g *gdmSessionBus) StartSessionWhenReady(serviceName string, shouldStartSession bool) *dbus.Error {
if g.username == "start-session-fails" {
return dbus.NewError(consts.DbusGdmPrefix+".Greeter.StartSessionWhenReady.Error.Failed", []interface{}{"failed to start session"})
}
return nil
}
// emitSignal is essentially a copy of dbus.Conn.Emit, but with the ability to specify the destination.
func emitSignal(conn *dbus.Conn, path dbus.ObjectPath, destination, name string, values ...interface{}) error {
i := strings.LastIndex(name, ".")
iface := name[:i]
member := name[i+1:]
msg := new(dbus.Message)
msg.Type = dbus.TypeSignal
msg.Headers = make(map[dbus.HeaderField]dbus.Variant)
msg.Headers[dbus.FieldInterface] = dbus.MakeVariant(iface)
msg.Headers[dbus.FieldMember] = dbus.MakeVariant(member)
msg.Headers[dbus.FieldPath] = dbus.MakeVariant(path)
msg.Headers[dbus.FieldDestination] = dbus.MakeVariant(destination)
msg.Body = values
if len(values) > 0 {
msg.Headers[dbus.FieldSignature] = dbus.MakeVariant(dbus.SignatureOf(values...))
}
if err := msg.IsValid(); err != nil {
return err
}
return conn.Send(msg, nil).Err
}
func setupPrivateBus() (*privateBus, error) {
address, tempDir, cleanup := startPrivateDbusServer()
conn, err := dbus.Dial(address)
if err != nil {
return nil, fmt.Errorf("failed to connect to session bus: %w", err)
}
err = conn.Auth(nil)
if err != nil {
return nil, fmt.Errorf("failed to authenticate: %w", err)
}
err = conn.Hello()
if err != nil {
return nil, fmt.Errorf("failed to say hello: %w", err)
}
g := &gdmSessionBus{conn: conn}
if err := conn.Export(g, dbus.ObjectPath("/org/gnome/DisplayManager/Session"), consts.DbusGdmPrefix+".UserVerifier"); err != nil {
return nil, fmt.Errorf("could not export UserVerifier mock: %w", err)
}
if err := conn.Export(g, dbus.ObjectPath("/org/gnome/DisplayManager/Session"), consts.DbusGdmPrefix+".Greeter"); err != nil {
return nil, fmt.Errorf("could not export Greeter mock: %w", err)
}
if err := conn.Export(g, dbus.ObjectPath("/org/gnome/DisplayManager/Session"), consts.DbusPeerPrefix); err != nil {
return nil, fmt.Errorf("could not export Peer mock: %w", err)
}
var reply dbus.RequestNameReply
reply, err = conn.RequestName(consts.DbusGdmPrefix+".UserVerifier", dbus.NameFlagDoNotQueue)
if err != nil {
return nil, fmt.Errorf("failed to acquire account name on local system bus: %w", err)
}
if reply != dbus.RequestNameReplyPrimaryOwner {
return nil, fmt.Errorf("failed to acquire account name on local system bus: name already taken")
}
reply, err = conn.RequestName(consts.DbusGdmPrefix+".Greeter", dbus.NameFlagDoNotQueue)
if err != nil {
return nil, fmt.Errorf("failed to acquire account name on local system bus: %w", err)
}
if reply != dbus.RequestNameReplyPrimaryOwner {
return nil, fmt.Errorf("failed to acquire account name on local system bus: name already taken")
}
return &privateBus{conn, tempDir, address, cleanup}, nil
}
func startPrivateDbusServer() (string, string, func()) {
privateBusDir, err := os.MkdirTemp("", "tests-private-dbus")
if err != nil {
log.Fatalf("Setup: can't create dbus system directory: %v", err)
}
slog.Debug(fmt.Sprintf("Created directory for private dbus: %s", privateBusDir))
config := filepath.Join(privateBusDir, "dbus.config")
err = os.WriteFile(config, []byte(`<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<type>system</type>
<keep_umask/>
<listen>unix:tmpdir=/tmp</listen>
<standard_system_servicedirs />
<policy context="default">
<allow send_destination="*" eavesdrop="true"/>
<allow eavesdrop="true"/>
<allow own="*"/>
</policy>
</busconfig>`), 0600)
if err != nil {
log.Fatalf("Setup: can't create dbus configuration: %v", err)
}
ctx, stopDbus := context.WithCancel(context.Background())
// #nosec G204 - this is only for tests, we are in control of the config
dbusCmd := exec.CommandContext(ctx, "dbus-daemon", "--print-address=1", "--config-file="+config)
dbusStdout, err := dbusCmd.StdoutPipe()
if err != nil {
_ = os.RemoveAll(privateBusDir)
log.Fatalf("couldn't get stdout of dbus-daemon: %v", err)
}
if err := dbusCmd.Start(); err != nil {
_ = os.RemoveAll(privateBusDir)
log.Fatalf("couldn't start dbus-daemon: %v", err)
}
dbusAddr := make([]byte, 256)
n, err := dbusStdout.Read(dbusAddr)
if err != nil {
_ = os.RemoveAll(privateBusDir)
log.Fatalf("couldn't get dbus address: %v", err)
}
dbusAddr = dbusAddr[:n]
return string(dbusAddr), privateBusDir, func() {
stopDbus()
_ = dbusCmd.Wait()
if err := os.RemoveAll(filepath.Dir(config)); err != nil {
log.Fatalf("couldn't remove dbus configuration directory: %v", err)
}
slog.Debug("Removed dbus configuration directory")
}
}
// CleanupPrivateBuses cleans up the private buses created for testing.
func CleanupPrivateBuses() {
for _, bus := range privateBuses {
bus.cleanup()
bus.conn.Close()
if err := os.RemoveAll(bus.tempDir); err != nil {
log.Fatalf("couldn't remove dbus configuration directory: %v", err)
}
slog.Debug(fmt.Sprintf("Removed directory for private dbus: %s", bus.tempDir))
}
}