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gpoimport.go
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gpoimport.go
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package analyze
import (
"encoding/xml"
"fmt"
"path/filepath"
"regexp"
"strings"
"github.com/go-ini/ini"
"github.com/lkarlslund/adalanche/modules/engine"
"github.com/lkarlslund/adalanche/modules/integrations/activedirectory"
"github.com/lkarlslund/adalanche/modules/ui"
"github.com/lkarlslund/adalanche/modules/windowssecurity"
"golang.org/x/text/encoding/unicode"
)
var (
gPCFileSysPath = engine.NewAttribute("gPCFileSysPath").Merge()
AbsolutePath = engine.NewAttribute("absolutePath").Single()
RelativePath = engine.NewAttribute("relativePath").Single()
BinarySize = engine.NewAttribute("binarySize").Single()
ExposedPassword = engine.NewAttribute("exposedPassword")
EdgeExposesPassword = engine.NewEdge("ExposesPassword").Tag("Pivot")
EdgeContainsSensitiveData = engine.NewEdge("ContainsSensitiveData")
EdgeReadSensitiveData = engine.NewEdge("ReadSensitiveData")
EdgeOwns = engine.NewEdge("Owns")
EdgeFSPartOfGPO = engine.NewEdge("FSPartOfGPO")
EdgeFileCreate = engine.NewEdge("FileCreate")
EdgeDirCreate = engine.NewEdge("DirCreate")
EdgeFileWrite = engine.NewEdge("FileWrite")
EdgeTakeOwnership = engine.NewEdge("FileTakeOwnership").Tag("Pivot")
EdgeModifyDACL = engine.NewEdge("FileModifyDACL").Tag("Pivot")
)
func init() {
engine.AddMergeApprover("Don't merge differing relative paths from GPOs", func(a, b *engine.Object) (*engine.Object, error) {
if a.HasAttr(RelativePath) || b.HasAttr(RelativePath) {
return nil, engine.ErrDontMerge
}
return nil, nil
})
}
var cpasswordusername = regexp.MustCompile(`(?i)cpassword="(?P<password>[^"]+)[^>]+(runAs|userName)="(?P<username>[^"]+)"`)
var usernamecpassword = regexp.MustCompile(`(?i)(runAs|userName)="(?P<username>[^"]+)[^>]+cpassword="(?P<password>[^"]+)"`)
func ImportGPOInfo(ginfo activedirectory.GPOdump, ao *engine.Objects) error {
gpoobject, _ := ao.FindOrAdd(gPCFileSysPath, engine.AttributeValueString(ginfo.Path))
for _, item := range ginfo.Files {
relativepath := strings.ToLower(strings.ReplaceAll(item.RelativePath, "\\", "/"))
if relativepath == "" {
relativepath = "/"
}
absolutepath := filepath.Join(ginfo.Path, relativepath)
objecttype := "File"
if item.IsDir {
objecttype = "Directory"
}
itemobject := ao.AddNew(
engine.IgnoreBlanks,
AbsolutePath, absolutepath,
RelativePath, relativepath,
engine.DisplayName, relativepath,
engine.ObjectCategorySimple, objecttype,
BinarySize, item.Size,
activedirectory.WhenChanged, item.Timestamp,
)
if relativepath == "/" {
itemobject.EdgeTo(gpoobject, EdgeFSPartOfGPO)
gpoobject.Adopt(itemobject)
} else {
parentpath := filepath.Join(ginfo.Path, filepath.Dir(relativepath))
if parentpath == "" {
parentpath = "/"
}
parent, _ := ao.FindOrAdd(AbsolutePath, engine.AttributeValueString(parentpath))
itemobject.EdgeTo(parent, EdgeFSPartOfGPO)
parent.Adopt(itemobject)
}
if !item.OwnerSID.IsNull() {
owner, _ := ao.FindOrAdd(engine.ObjectSid, engine.AttributeValueSID(item.OwnerSID))
owner.EdgeTo(itemobject, EdgeOwns)
}
if item.DACL != nil {
dacl, err := engine.ParseACL(item.DACL)
if err != nil {
return err
}
for _, entry := range dacl.Entries {
entrysidobject, _ := ao.FindOrAdd(activedirectory.ObjectSid, engine.AttributeValueSID(entry.SID))
if entry.Type == engine.ACETYPE_ACCESS_ALLOWED && (entry.SID.Component(2) == 21 || entry.SID == windowssecurity.EveryoneSID || entry.SID == windowssecurity.AuthenticatedUsersSID) {
if item.IsDir && entry.Mask&engine.FILE_ADD_FILE != 0 {
entrysidobject.EdgeTo(itemobject, EdgeFileCreate)
}
if item.IsDir && entry.Mask&engine.FILE_ADD_SUBDIRECTORY != 0 {
entrysidobject.EdgeTo(itemobject, EdgeDirCreate)
}
if !item.IsDir && entry.Mask&engine.FILE_WRITE_DATA != 0 {
entrysidobject.EdgeTo(itemobject, EdgeFileWrite)
}
if entry.Mask&engine.RIGHT_WRITE_OWNER != 0 {
entrysidobject.EdgeTo(itemobject, EdgeTakeOwnership) // Not sure about this one
}
if entry.Mask&engine.RIGHT_WRITE_DACL != 0 {
entrysidobject.EdgeTo(itemobject, EdgeModifyDACL)
}
}
}
}
var exposed []struct{ Username, Password string }
for _, line := range strings.Split(string(item.Contents), "\n") {
var unhandledpass bool
// FIXME: Handle other formats, adding something to catch this here
if strings.Contains(line, "cpassword=") && !strings.Contains(line, "cpassword=\"\"") {
unhandledpass = true // assume failure
}
for _, match := range cpasswordusername.FindAllStringSubmatch(line, -1) {
ui.Debug().Msgf("Found password in %s", item.RelativePath)
ui.Debug().Msgf("Password: %v", match)
ui.Debug().Msgf("GPO Dump\n%s", item.Contents)
exposed = append(exposed, struct{ Username, Password string }{match[cpasswordusername.SubexpIndex("username")], match[cpasswordusername.SubexpIndex("password")]})
unhandledpass = false
}
for _, match := range usernamecpassword.FindAllStringSubmatch(line, -1) {
ui.Debug().Msgf("Found username in %s", item.RelativePath)
ui.Debug().Msgf("Password: %v", match)
ui.Debug().Msgf("GPO Dump\n%s", item.Contents)
exposed = append(exposed, struct{ Username, Password string }{match[usernamecpassword.SubexpIndex("username")], match[usernamecpassword.SubexpIndex("password")]})
unhandledpass = false
}
if unhandledpass {
ui.Error().Msgf("Unhandled password in %s", item.RelativePath)
ui.Error().Msgf("GPO Dump\n%s", item.Contents)
ui.Fatal().Msg("Please submit bugreport on Github with redacted account name and redacted password")
}
}
for _, e := range exposed {
// New object to contain the sensitive data
expobj := ao.AddNew(
engine.ObjectCategorySimple, "ExposedPassword",
engine.DisplayName, "Exposed password for "+e.Username,
engine.Description, "Password is exposed in GPO with GUID "+ginfo.GUID.String(),
engine.ObjectGUID, ginfo.GUID,
ExposedPassword, e.Password,
RelativePath, relativepath,
AbsolutePath, filepath.Join(ginfo.Path, relativepath),
)
// The account targeted
target, _ := ao.FindOrAdd(
engine.SAMAccountName, engine.AttributeValueString(e.Username),
)
// GPO exposes this object
itemobject.EdgeTo(expobj, EdgeContainsSensitiveData)
// Exposed password leaks this object
expobj.EdgeTo(target, EdgeExposesPassword)
// Everyone that can read the file can then read the password
if item.DACL != nil {
dacl, err := engine.ParseACL(item.DACL)
if err != nil {
return err
}
for _, entry := range dacl.Entries {
entrysidobject, _ := ao.FindOrAdd(activedirectory.ObjectSid, engine.AttributeValueSID(entry.SID))
if entry.Type == engine.ACETYPE_ACCESS_ALLOWED && (entry.SID.Component(2) == 21 || entry.SID == windowssecurity.EveryoneSID || entry.SID == windowssecurity.AuthenticatedUsersSID) {
if entry.Mask&engine.FILE_READ_DATA != 0 {
entrysidobject.EdgeTo(expobj, EdgeReadSensitiveData)
}
}
}
}
}
switch relativepath {
case "/machine/preferences/groups/groups.xml", "/machine/microsoft/windows nt/secedit/gpttmpl.inf":
var pairs []SIDpair
if strings.HasSuffix(relativepath, ".xml") {
pairs = GPOparseGroups(string(item.Contents))
} else if strings.HasSuffix(relativepath, ".inf") {
pairs = GPOparseGptTmplInf(string(item.Contents))
}
for _, sidpair := range pairs {
var member *engine.Object
if sidpair.MemberSID == "" {
// Just use the name, we assume it's a domain object
member, _ = ao.FindOrAdd(engine.SAMAccountName, engine.AttributeValueString(sidpair.MemberName))
} else {
// Use the SID
membersid, err := windowssecurity.ParseStringSID(sidpair.MemberSID)
if err == nil {
member = ao.FindOrAddSID(membersid)
}
}
if member != nil {
switch sidpair.GroupSID {
case "S-1-5-32-544":
member.EdgeTo(gpoobject, activedirectory.EdgeLocalAdminRights)
case "S-1-5-32-562":
member.EdgeTo(gpoobject, activedirectory.EdgeLocalDCOMRights)
case "S-1-5-32-555":
member.EdgeTo(gpoobject, activedirectory.EdgeLocalRDPRights)
case "":
ui.Warn().Msgf("GPO indicating group membership, but no group SID found for %s", sidpair.GroupName)
}
} else {
ui.Warn().Msgf("Detected local group membership via GPO, but could not parse SID %v for member %v", sidpair.MemberSID, sidpair.MemberName)
}
}
// Description: "Indicates that a GPO deploys a scheduled task which is running from an UNC path (FIXME, not done yet!)",
case "/machine/preferences/scheduledtasks/scheduledtasks.xml":
for _, task := range GPOparseScheduledTasks(string(item.Contents)) {
ui.Warn().Msgf("Scheduled task: %v ... FIXME!", task)
}
// Description: "Detects startup or shutdown scripts from GPOs",
case "/machine/scripts/scripts.ini":
scripts := string(item.Contents)
utf8 := make([]byte, len(scripts)/2)
_, _, err := unicode.UTF16(unicode.LittleEndian, unicode.UseBOM).NewDecoder().Transform(utf8, []byte(scripts), true)
if err != nil {
utf8 = []byte(scripts)
}
// ini.LineBreak = "\n"
inifile, err := ini.LoadSources(ini.LoadOptions{
SkipUnrecognizableLines: true,
}, utf8)
if err != nil {
ui.Warn().Msgf("Problem loading GPO ini file SCRIPTS.INI from %v: %v", ginfo.Path, err)
}
scriptnum := 0
for {
k1 := inifile.Section("Startup").Key(fmt.Sprintf("%vCmdLine", scriptnum))
k2 := inifile.Section("Startup").Key(fmt.Sprintf("%vParameters", scriptnum))
if k1.String() == "" {
break
}
// Create new synthetic object
sob := engine.NewObject(
engine.ObjectCategorySimple, engine.AttributeValueString("Script"),
engine.DistinguishedName, engine.AttributeValueString(fmt.Sprintf("CN=Startup Script %v from GPO %v,CN=synthetic", scriptnum, ginfo.GUID)),
engine.Name, engine.AttributeValueString("Machine startup script "+strings.Trim(k1.String()+" "+k2.String(), " ")),
)
ao.Add(sob)
sob.EdgeTo(gpoobject, activedirectory.EdgeMachineScript)
sob.ChildOf(gpoobject) // tree
scriptnum++
}
scriptnum = 0
for {
k1 := inifile.Section("Shutdown").Key(fmt.Sprintf("%vCmdLine", scriptnum))
k2 := inifile.Section("Shutdown").Key(fmt.Sprintf("%vParameters", scriptnum))
if k1.String() == "" {
break
}
// Create new synthetic object
sob := engine.NewObject(
engine.DistinguishedName, engine.AttributeValueString(fmt.Sprintf("CN=Shutdown Script %v from GPO %v,CN=synthetic", scriptnum, ginfo.GUID)),
engine.ObjectCategorySimple, engine.AttributeValueString("Script"),
engine.Name, engine.AttributeValueString("Machine shutdown script "+strings.Trim(k1.String()+" "+k2.String(), " ")),
)
ao.Add(sob)
sob.EdgeTo(gpoobject, activedirectory.EdgeMachineScript)
sob.ChildOf(gpoobject)
scriptnum++
}
}
}
return nil
}
type ScheduledTasks struct {
Tasks []TaskV2 `xml:"TaskV2"`
}
type TaskV2 struct {
UserID string `xml:"Properties>Task>Principals>Principal>UserId"`
RunLevel string `xml:"Properties>Task>Principals>Principal>RunLevel"`
Actions []Action `xml:"Properties>Task>Actions"`
}
type Action struct {
Command string `xml:"Exec>Command"`
Arguments string `xml:"Exec>Arguments"`
}
var (
uncexec = regexp.MustCompile(`\\\\.*\\.*\\.*\.(cmd|bat|ps1|vbs|exe|dll)`)
importantsids = regexp.MustCompile(`S-1-5-32-(544|555|562)`)
)
func GPOparseScheduledTasks(rawxml string) []string {
var results []string
var tasks ScheduledTasks
err := xml.Unmarshal([]byte(rawxml), &tasks)
if err == nil {
for _, task := range tasks.Tasks {
if task.RunLevel == "HighestAvailable" {
for _, action := range task.Actions {
cmd := action.Command + " " + action.Arguments
// Check if we're running remote stuff
if remoteexec := uncexec.FindAllString(cmd, -1); remoteexec != nil {
results = append(results, remoteexec...)
}
}
}
}
}
return results
}
type Groups struct {
XMLName xml.Name `xml:"Groups"`
Group []Group
}
type Group struct {
XMLName xml.Name `xml:"Group"`
Name string `xml:"name,attr"`
Properties []Properties
}
type Properties struct {
Action string `xml:"action,attr"`
SID string `xml:"groupSid,attr"`
Name string `xml:"groupName,attr"`
Members Members
}
type Members struct {
Member []Member
}
type Member struct {
// XMLName xml.Name `xml:"Member"`
Action string `xml:"action,attr"`
Name string `xml:"name,attr"`
SID string `xml:"sid,attr"`
}
type SIDpair struct {
GroupSID string
GroupName string
MemberSID string
MemberName string
}
func GPOparseGroups(rawxml string) []SIDpair {
var results []SIDpair
var groups Groups
err := xml.Unmarshal([]byte(rawxml), &groups)
if err == nil {
for _, group := range groups.Group {
for _, prop := range group.Properties {
if prop.Action == "U" && importantsids.MatchString(prop.SID) {
for _, member := range prop.Members.Member {
if member.Action == "ADD" {
results = append(results, SIDpair{
GroupSID: prop.SID,
GroupName: prop.Name,
MemberSID: member.SID,
MemberName: member.Name,
})
}
}
}
}
}
}
return results
}
func GPOparseGptTmplInf(rawini string) []SIDpair {
var results []SIDpair
utf8 := make([]byte, len(rawini)/2)
_, _, err := unicode.UTF16(unicode.LittleEndian, unicode.UseBOM).NewDecoder().Transform(utf8, []byte(rawini), true)
if err != nil {
utf8 = []byte(rawini)
}
// ini.LineBreak = "\n"
gpt, err := ini.LoadSources(ini.LoadOptions{
SkipUnrecognizableLines: true,
}, utf8)
if err == nil {
for _, key := range gpt.Section("Group Membership").Keys() {
k := key.Name()
v := key.String()
if v == "" {
// No useful data
continue
}
if strings.HasSuffix(k, "__Memberof") {
// LHS SID is member of RHS SID groups
membersid := strings.TrimSuffix(k, "__Memberof")
var membername string
if strings.HasPrefix(membersid, "*") {
// SIDs have an asterisk in front
membersid = membersid[1:]
} else {
// Usernames does not
membername = membersid
membersid = ""
translatedsid, err := TranslateLocalizedNameToSID(membername)
if err != nil {
ui.Info().Msgf("GPO GptTmplInf Memberof non-SID member %v translation gave no results, assuming it's a custom name: %v", membername, err)
} else {
membersid = translatedsid.String()
}
}
groups := strings.Split(v, ",")
for _, groupsid := range groups {
var groupname string
if strings.HasPrefix(groupsid, "*") {
groupsid = strings.Trim(groupsid[1:], " ")
} else {
// Not a SID - using localized group name (thanks, Microsoft)
// We have a couple we can try - please contribute with more
groupname = groupsid
groupsid = ""
translatedsid, err := TranslateLocalizedNameToSID(groupname)
if err != nil {
ui.Info().Msgf("GPO GptTmplInf Memberof non-SID group %v translation gave no results (PLEASE CONTRIBUTE): %v", groupname, err)
} else {
groupsid = translatedsid.String()
}
}
results = append(results, SIDpair{
GroupSID: groupsid,
GroupName: groupname,
MemberSID: strings.Trim(membersid, " "),
MemberName: strings.Trim(membername, " "),
})
}
} else if strings.HasSuffix(k, "__Members") {
// LHS SID group has RHS SID as members
groupsid := strings.TrimSuffix(k, "__Members")
var groupname string
if strings.HasPrefix(groupsid, "*") {
groupsid = strings.Trim(groupsid[1:], " ")
} else {
// Not a SID - using localized group name (thanks, Microsoft)
// We have a couple we can try - please contribute with more
groupname = groupsid
groupsid = ""
translatedsid, err := TranslateLocalizedNameToSID(groupname)
if err != nil {
// Maybe it's "administrator"?
ui.Warn().Msgf("GPO GptTmplInf Memberof non-SID group %v translation failed (PLEASE CONTRIBUTE): %v", groupname, err)
} else {
groupsid = translatedsid.String()
}
}
members := strings.Split(v, ",")
for _, membersid := range members {
var membername string
if strings.HasPrefix(membersid, "*") {
membersid = membersid[1:]
} else {
membername = membersid
membersid = ""
translatedsid, err := TranslateLocalizedNameToSID(membername)
if err != nil {
ui.Warn().Msgf("GPO GptTmplInf Memberof non-SID member %v translation failed (PLEASE CONTRIBUTE): %v", membername, err)
} else {
membersid = translatedsid.String()
}
}
results = append(results, SIDpair{
GroupSID: groupsid,
GroupName: groupname,
MemberSID: membersid,
MemberName: membername,
})
}
}
}
}
return results
}