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sessions.go
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sessions.go
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// +build windows
package winapi
import (
"fmt"
"os"
"reflect"
"sort"
"strings"
"syscall"
"time"
"unsafe"
so "github.com/Codehardt/go-win64api/shared"
)
var (
modSecur32 = syscall.NewLazyDLL("secur32.dll")
sessLsaFreeReturnBuffer = modSecur32.NewProc("LsaFreeReturnBuffer")
sessLsaEnumerateLogonSessions = modSecur32.NewProc("LsaEnumerateLogonSessions")
sessLsaGetLogonSessionData = modSecur32.NewProc("LsaGetLogonSessionData")
sessNetSessionEnum = modNetapi32.NewProc("NetSessionEnum")
)
type LUID struct {
LowPart uint32
HighPart int32
}
type SECURITY_LOGON_SESSION_DATA struct {
Size uint32
LogonId LUID
UserName LSA_UNICODE_STRING
LogonDomain LSA_UNICODE_STRING
AuthenticationPackage LSA_UNICODE_STRING
LogonType uint32
Session uint32
Sid uintptr
LogonTime uint64
LogonServer LSA_UNICODE_STRING
DnsDomainName LSA_UNICODE_STRING
Upn LSA_UNICODE_STRING
}
type LSA_UNICODE_STRING struct {
Length uint16
MaximumLength uint16
buffer uintptr
}
type SESSION_INFO_2 struct {
Sesi2_cname *uint16
Sesi2_username *uint16
Sesi2_num_opens uint32
Sesi2_time uint32
Sesi2_idle_time uint32
Sesi2_user_flags uint32
Sesi2_cltype_name *uint16
}
func ListNetworkSessions() ([]so.NetworkSession, error) {
var (
dataPointer uintptr
resumeHandle uintptr
entriesRead uint32
entriesTotal uint32
sizeTest SESSION_INFO_2
retVal = make([]so.NetworkSession, 0)
)
ret, _, _ := sessNetSessionEnum.Call(
uintptr(0),
uintptr(0),
uintptr(0),
uintptr(uint32(2)), // SESSION_INFO_2
uintptr(unsafe.Pointer(&dataPointer)),
uintptr(uint32(USER_MAX_PREFERRED_LENGTH)),
uintptr(unsafe.Pointer(&entriesRead)),
uintptr(unsafe.Pointer(&entriesTotal)),
uintptr(unsafe.Pointer(&resumeHandle)),
)
if ret != NET_API_STATUS_NERR_Success {
return nil, fmt.Errorf("error fetching network sessions")
} else if dataPointer == uintptr(0) {
return nil, nil
}
var iter = dataPointer
for i := uint32(0); i < entriesRead; i++ {
var data = (*SESSION_INFO_2)(unsafe.Pointer(iter))
sd := so.NetworkSession{
Clientname: UTF16toString(data.Sesi2_cname),
Username: UTF16toString(data.Sesi2_username),
NumOpens: data.Sesi2_num_opens,
Time: time.Duration(data.Sesi2_time) * time.Second,
IdleTime: time.Duration(data.Sesi2_idle_time) * time.Second,
UserFlags: data.Sesi2_user_flags,
ClientType: UTF16toString(data.Sesi2_cltype_name),
}
retVal = append(retVal, sd)
iter = uintptr(unsafe.Pointer(iter + unsafe.Sizeof(sizeTest)))
}
usrNetApiBufferFree.Call(dataPointer)
return retVal, nil
}
func ListLoggedInUsers() ([]so.SessionDetails, error) {
var (
logonSessionCount uint64
loginSessionList uintptr
sizeTest LUID
uList []string = make([]string, 0)
uSessList []so.SessionDetails = make([]so.SessionDetails, 0)
PidLUIDList map[uint32]SessionLUID
)
PidLUIDList, err := ProcessLUIDList()
if err != nil {
return nil, fmt.Errorf("Error getting process list, %s.", err.Error())
}
_, _, _ = sessLsaEnumerateLogonSessions.Call(
uintptr(unsafe.Pointer(&logonSessionCount)),
uintptr(unsafe.Pointer(&loginSessionList)),
)
defer sessLsaFreeReturnBuffer.Call(uintptr(unsafe.Pointer(&loginSessionList)))
var iter uintptr = uintptr(unsafe.Pointer(loginSessionList))
for i := uint64(0); i < logonSessionCount; i++ {
var sessionData uintptr
_, _, _ = sessLsaGetLogonSessionData.Call(uintptr(iter), uintptr(unsafe.Pointer(&sessionData)))
if sessionData != uintptr(0) {
var data *SECURITY_LOGON_SESSION_DATA = (*SECURITY_LOGON_SESSION_DATA)(unsafe.Pointer(sessionData))
if data.Sid != uintptr(0) {
validTypes := []uint32{so.SESS_INTERACTIVE_LOGON, so.SESS_CACHED_INTERACTIVE_LOGON, so.SESS_REMOTE_INTERACTIVE_LOGON}
if in_array(data.LogonType, validTypes) {
strLogonDomain := strings.ToUpper(LsatoString(data.LogonDomain))
if strLogonDomain != "WINDOW MANAGER" && strLogonDomain != "FONT DRIVER HOST" {
sUser := fmt.Sprintf("%s\\%s", strings.ToUpper(LsatoString(data.LogonDomain)), strings.ToLower(LsatoString(data.UserName)))
sort.Strings(uList)
i := sort.Search(len(uList), func(i int) bool { return uList[i] >= sUser })
if !(i < len(uList) && uList[i] == sUser) {
if uok, isAdmin := luidinmap(&data.LogonId, &PidLUIDList); uok {
uList = append(uList, sUser)
ud := so.SessionDetails{
Username: LsatoString(data.UserName),
Domain: strLogonDomain,
LocalAdmin: isAdmin,
LogonType: data.LogonType,
DnsDomainName: LsatoString(data.DnsDomainName),
LogonTime: uint64TimestampToTime(data.LogonTime),
AuthenticationPackage: LsatoString(data.AuthenticationPackage),
LogonServer: LsatoString(data.LogonServer),
LogonId: fmt.Sprintf("%x%x", data.LogonId.HighPart, data.LogonId.LowPart),
}
hn, _ := os.Hostname()
if strings.ToUpper(ud.Domain) == strings.ToUpper(hn) {
ud.LocalUser = true
if isAdmin, _ := IsLocalUserAdmin(ud.Username); isAdmin {
ud.LocalAdmin = true
}
} else {
if isAdmin, _ := IsDomainUserAdmin(ud.Username, LsatoString(data.DnsDomainName)); isAdmin {
ud.LocalAdmin = true
}
}
uSessList = append(uSessList, ud)
}
}
}
}
}
}
iter = uintptr(unsafe.Pointer(iter + unsafe.Sizeof(sizeTest)))
_, _, _ = sessLsaFreeReturnBuffer.Call(uintptr(unsafe.Pointer(sessionData)))
}
return uSessList, nil
}
func uint64TimestampToTime(nsec uint64) time.Time {
// change starting time to the Epoch (00:00:00 UTC, January 1, 1970)
nsec -= 116444736000000000
// convert into nanoseconds
nsec *= 100
return time.Unix(0, int64(nsec))
}
func sessUserLUIDs() (map[LUID]string, error) {
var (
logonSessionCount uint64
loginSessionList uintptr
sizeTest LUID
uList map[LUID]string = make(map[LUID]string)
)
_, _, _ = sessLsaEnumerateLogonSessions.Call(
uintptr(unsafe.Pointer(&logonSessionCount)),
uintptr(unsafe.Pointer(&loginSessionList)),
)
defer sessLsaFreeReturnBuffer.Call(uintptr(unsafe.Pointer(&loginSessionList)))
var iter uintptr = uintptr(unsafe.Pointer(loginSessionList))
for i := uint64(0); i < logonSessionCount; i++ {
var sessionData uintptr
_, _, _ = sessLsaGetLogonSessionData.Call(uintptr(iter), uintptr(unsafe.Pointer(&sessionData)))
if sessionData != uintptr(0) {
var data *SECURITY_LOGON_SESSION_DATA = (*SECURITY_LOGON_SESSION_DATA)(unsafe.Pointer(sessionData))
if data.Sid != uintptr(0) {
uList[data.LogonId] = fmt.Sprintf("%s\\%s", strings.ToUpper(LsatoString(data.LogonDomain)), strings.ToLower(LsatoString(data.UserName)))
}
}
iter = uintptr(unsafe.Pointer(iter + unsafe.Sizeof(sizeTest)))
_, _, _ = sessLsaFreeReturnBuffer.Call(uintptr(unsafe.Pointer(sessionData)))
}
return uList, nil
}
func luidinmap(needle *LUID, haystack *map[uint32]SessionLUID) (bool, bool) {
for _, l := range *haystack {
if reflect.DeepEqual(l.Value, *needle) {
if l.IsAdmin {
return true, true
} else {
return true, false
}
}
}
return false, false
}
func LsatoString(p LSA_UNICODE_STRING) string {
return syscall.UTF16ToString((*[4096]uint16)(unsafe.Pointer(p.buffer))[:p.Length])
}
func in_array(val interface{}, array interface{}) (exists bool) {
exists = false
switch reflect.TypeOf(array).Kind() {
case reflect.Slice:
s := reflect.ValueOf(array)
for i := 0; i < s.Len(); i++ {
if reflect.DeepEqual(val, s.Index(i).Interface()) == true {
exists = true
return
}
}
}
return
}