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authorflouthoc <flouthoc.git@gmail.com>2021-08-12 18:48:39 +0530
committerflouthoc <flouthoc.git@gmail.com>2021-08-17 16:18:54 +0530
commite7ee15f8c39122e0d2b343ce9a3c0b577af45f40 (patch)
tree17211b2df3e4306ea962697607a727486626363b /pkg/systemd
parent8c228bdbd031e5930e6319e8fe25b3ff340919f3 (diff)
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cgroup-manager-systemd:Fail early if user:rootless and relevent session is not present.
[NO TESTS NEEDED] Signed-off-by: flouthoc <flouthoc.git@gmail.com>
Diffstat (limited to 'pkg/systemd')
-rw-r--r--pkg/systemd/dbus.go98
1 files changed, 98 insertions, 0 deletions
diff --git a/pkg/systemd/dbus.go b/pkg/systemd/dbus.go
index 718082526..c49f537b6 100644
--- a/pkg/systemd/dbus.go
+++ b/pkg/systemd/dbus.go
@@ -9,8 +9,106 @@ import (
"github.com/containers/podman/v3/pkg/rootless"
"github.com/coreos/go-systemd/v22/dbus"
godbus "github.com/godbus/dbus/v5"
+ "github.com/sirupsen/logrus"
)
+// IsSystemdSessionValid checks if sessions is valid for provided rootless uid.
+func IsSystemdSessionValid(uid int) bool {
+ var conn *godbus.Conn
+ var err error
+ var object godbus.BusObject
+ var seat0Path godbus.ObjectPath
+ dbusDest := "org.freedesktop.login1"
+ dbusInterface := "org.freedesktop.login1.Manager"
+ dbusPath := "/org/freedesktop/login1"
+
+ if rootless.IsRootless() {
+ conn, err = GetLogindConnection(rootless.GetRootlessUID())
+ object = conn.Object(dbusDest, godbus.ObjectPath(dbusPath))
+ if err != nil {
+ //unable to fetch systemd object for logind
+ logrus.Debugf("systemd-logind: %s", err)
+ return false
+ }
+ object = conn.Object(dbusDest, godbus.ObjectPath(dbusPath))
+ if err := object.Call(dbusInterface+".GetSeat", 0, "seat0").Store(&seat0Path); err != nil {
+ //unable to get seat0 path.
+ logrus.Debugf("systemd-logind: %s", err)
+ return false
+ }
+ seat0Obj := conn.Object(dbusDest, seat0Path)
+ activeSession, err := seat0Obj.GetProperty(dbusDest + ".Seat.ActiveSession")
+ if err != nil {
+ //unable to get active sessions.
+ logrus.Debugf("systemd-logind: %s", err)
+ return false
+ }
+ activeSessionMap, ok := activeSession.Value().([]interface{})
+ if !ok || len(activeSessionMap) < 2 {
+ //unable to get active session map.
+ logrus.Debugf("systemd-logind: %s", err)
+ return false
+ }
+ activeSessionPath, ok := activeSessionMap[1].(godbus.ObjectPath)
+ if !ok {
+ //unable to fetch active session path.
+ logrus.Debugf("systemd-logind: %s", err)
+ return false
+ }
+ activeSessionObj := conn.Object(dbusDest, activeSessionPath)
+ sessionUser, err := activeSessionObj.GetProperty(dbusDest + ".Session.User")
+ if err != nil {
+ //unable to fetch session user from activeSession path.
+ logrus.Debugf("systemd-logind: %s", err)
+ return false
+ }
+ dbusUser, ok := sessionUser.Value().([]interface{})
+ if !ok {
+ // not a valid user.
+ return false
+ }
+ if len(dbusUser) < 2 {
+ // not a valid session user.
+ return false
+ }
+ activeUID, ok := dbusUser[0].(uint32)
+ if !ok {
+ return false
+ }
+ //active session found which belongs to following rootless user
+ if activeUID == uint32(uid) {
+ return true
+ }
+ return false
+ }
+ return true
+}
+
+// GetDbusConnection returns an user connection to D-BUS
+func GetLogindConnection(uid int) (*godbus.Conn, error) {
+ return dbusAuthConnectionLogind(uid)
+}
+
+func dbusAuthConnectionLogind(uid int) (*godbus.Conn, error) {
+ var conn *godbus.Conn
+ var err error
+ conn, err = godbus.SystemBusPrivate()
+ if err != nil {
+ return nil, err
+ }
+ methods := []godbus.Auth{godbus.AuthExternal(strconv.Itoa(uid))}
+ if err = conn.Auth(methods); err != nil {
+ conn.Close()
+ return nil, err
+ }
+ err = conn.Hello()
+ if err != nil {
+ conn.Close()
+ return nil, err
+ }
+ return conn, nil
+}
+
func dbusAuthRootlessConnection(createBus func(opts ...godbus.ConnOption) (*godbus.Conn, error)) (*godbus.Conn, error) {
conn, err := createBus()
if err != nil {